2012 international residential code update with maryland amendments based on the 2012 international...

2012 International Residential Code Update with Maryland Amendments

Based on the 2012 International Building Code® (IBC®) and COMAR 05.02.07

Maryland Code Administration

http://www.maryland.gov/

http://www.dhcd.state.md.us/

http://www.dhcd.state.md.us/

Description It is important to have an up-to-date residential construction

code addressing the design and construction of one- and two-family dwellings and townhouses to protect the health and safety of the public as well as provide affordable housing.

There have been key changes made to the International Residential Code® (IRC®) since the 2009 edition.

This course will identify important changes in the IRC from 2009 to 2012 edition, including amendments in COMAR 05.02.07. Participants will be presented with those changes that will most impact their use of the code when they adopt the 2012 IRC. The learner will receive an overview of the most important code changes.

2012 IRC Update with Maryland Amendments 2

Goal

Participants will be able to use this document to identify changes from the 2009 IRC to the 2012 IRC, as well as COMAR 05.02.07, allowing them to apply these code requirements to design, plan review and/or inspection.

32012 IRC Update with Maryland Amendments

Objectives


Upon completion, participants will be better able to: 1. Identify the key changes between the 2009 IRC and

the 2012 IRC, as well as COMAR 05.02.07. 2. Explain the differences between the current and

previous edition. 3. Identify changes in organization and code

requirements. 4. Identify the applicability of design, plan review and

inspection requirements. 5. Apply the Maryland Amendments to the 2012 IBC

and identify critical dates for implementation and enforcement by local Maryland Jurisdictions.

ContentChapters are divided for code development purposes and this handout as follows:

Administration, Chapters 1-2 Building Provisions, Chapters 3-10 Energy Efficiency, Chapter 11 Mechanical, Chapters 12-23 Fuel Gas, Chapter 24 Plumbing, Chapters 25-33 Electrical, Chapters 34-43 Referenced Standards, Chapter 44

Note: Not all chapters have significant changes covered in this handout.


Marginal Markings within the codebook

Solid vertical lines indicate a technical change

from the requirements of the 2009 edition.

Arrows indicate where a section, paragraph,

item in a list, exception or table has been deleted.

A single asterisk [*] indicates that text or a table

has been relocated elsewhere in the code.

A double asterisk [**] indicates that the section

or table immediately following has been relocated

here from a different section.

6

***


The new Code Development Process

Highlights of the plan include:

Maintains 3-year publication cycle

Maintains the ICC Governmental Consensus Process

Divides the codes into two groupings for purposes of Code Development

and Final Action Hearings – one group heard each year.

An unveiling of all the new codes at the Annual Conference in the third year

Holding Code Development Hearings at the same central location every

April/May

Holding all Final Action Hearings at the Annual Conference at locations

which will continue to rotate through the four quadrants of the U.S. in late

October/early November.


Maryland Provisions

Three-part Process

8

Annotated Code of

Maryland

COMAR05.02.07

Local Adoption,

Implementation and

Enforcement




Annotated Code of Maryland

Enabling legislation that creates the framework for the Maryland Building Performance Standards. Public Safety Article TITLE 12. BUILDING AND MATERIAL CODES; OTHER

SAFETY PROVISIONS SUBTITLE 5. MARYLAND BUILDING PERFORMANCE

STANDARDS



Duties of the Maryland Codes Administration (COMAR)

Must adopt as part of the Standards (MBPS) the IBC, the IRC and the IECC within 12 months of the issuance by ICC.

Amendments to the IBC and IRC may not be more stringent than the provisions found in those documents.

Amendments to the IECC must not lessen any of the IECC requirements.



http://www.iccsafe.org/Store/Pages/Product.aspx?category=0&cat=ICCSafe&id=3800X12

http://www.iccsafe.org/Store/Pages/Product.aspx?category=14604&cat=ICCSafe&id=3100X12

Local Jurisdiction Amendments

Local Amendments must not prohibit the minimum implementation and enforcement set forth in §12-505 Review and accept plans Issuance of building permits Inspection of the work authorized by building permit Issuance of appropriate occupancy certificates

Weaken energy conservation and efficiency provisions of the Standards



Local jurisdictions SHALL implement and enforce the most current version of the standards and any local amendments.

Local Jurisdiction Implementation and Enforcement

12

No later than 6 months after adoption by the State.



Key Maryland Dates COMAR adoption of the 2012 IBC:

January 1, 2012 Local implementation and Enforcement:

Within 6 months after January 1, 2012 Local amendments to Maryland Codes

Administration: At least within 15 days prior to local effective

date Or within 5 days after emergency local

adoption



COMAR 05.02.07.03 B. Terms.

New term, “High performance home,” has the meaning stated in Public Safety Article, §12-509(a), Annotated Code of Maryland

§ 12-509. Encouragement of high-performance homes

(a) "High-performance home" defined. -- In this section, "high-performance home" means a new residential structure that meets or exceeds the current version of:

(1) the Silver rating of the International Code Council's 700 National Green Building Standards; or

(2) the Silver rating of the U.S. Green Building Council's LEED (Leadership in Energy and Environmental Design) for Homes Rating System.



2012 IRC COMAR Modifications

Chapter 1. Delete the Section 102.5 Appendices and Replace with the following:

102.5 Appendices: All the provisions in the Appendices are adopted as part of the IRC except those in Appendices E, J, and L.




MECHANICAL. Chapter 12 MECHANICAL ADMINISTRATION. Add note to Section M1201.1 Scope: The subject matter of chapters 12 through 24 is not within the scope of the Maryland Building Performance Standards. For the applicable requirements concerning the mechanical systems, refer to the local mechanical code and the mechanical code adopted pursuant to the provisions of the Business Regulations Article, §9A-205, Annotated Code of Maryland.




PLUMBING. Chapter 25 PLUMBING ADMINISTRATION. Add note to Section P2501.1 Scope: The subject matter of chapters 25 through 33 is not within the scope of the Maryland Building Performance Standards. For the applicable requirements concerning the plumbing systems, refer to the local plumbing code and the plumbing code adopted pursuant to the provisions of the Business Occupations and Professions Article, Title 12, Annotated Code of Maryland.




ELECTRICAL. Chapter 34. GENERAL REQUIREMENTS. Add note to Section 3401.1 Applicability: The subject matter of chapters 34 through 43 is not within the scope of the Maryland Building Performance Standards. For the applicable electrical requirements, refer to the local electrical code and the National Electrical Code as adopted and enforced by the State Fire Marshal, authorized fire officials, or building officials pursuant to the provisions of the Public Safety Article, title 12, Subtitle 6, Annotated Code of Maryland.



COMAR 05.02.07.04 E

New Section added as follows:

E. The Department encourages:

(1) Home builders to construct new high performance homes; and

(2) Local jurisdictions to amend these standards to allow builders to construct high performance homes.



COMAR Modifications to the IBC and IECC

Additional modifications are made as part of the Maryland Building Performance Standards to the IBC and the IECC. Those modifications are part of the Update Classes for the IBC and IECC are being offered by the Maryland Codes Administration through the International Code Council.

2012 IRC Update with Maryland Amendments 20


Scope and AdministrationChapters 1-2

21

Changes in Chapter 1Scope and Administration

Section R101.2 Scope

The 2012 Code adds an exception to the scope that allows the IRC to be applied to owner-occupied lodging houses with 5 or fewer guest rooms. A typical lodging house is a bed and breakfast.

22Handout page 22012 IRC Update with Maryland Amendments

Section R102.4.2 Provisions in Codes and Standards (NEW)

There are often instances where the scope of the code and the scope of a standard overlap. Often, there is confusion as to which should govern. This new section clarifies that the scope of the IRC would govern in such circumstances.


Changes in Chapter 2Definitions (NEW)GUESTROOM. Any room or rooms used or intended to be used by one or more guests for living or sleeping purposes.


Changes in Chapter 2Definitions (NEW)

LODGING HOUSE. A one-family dwelling where one or more occupants are primarily permanent in nature, and rent is paid for guestrooms.


Changes in Chapter 2Definitions (NEW)PHOTOVOLTAIC MODULES/SHINGLES. A roof covering composed of flat-plate photovoltaic modules fabricated into shingles.


Changes in Chapter 2Definitions (NEW)

WHOLE-HOUSE MECHANICAL VENTILATION SYSTEM. An exhaust system, supply system, or combination thereof that is designed to mechanically exchange indoor air for outdoor air when operating continuously or through a programmed intermittent schedule to satisfy the whole-house ventilation.


Knowledge Review

1. What use of homes built within the scope of the IRC has been added in the 2012 edition?

Bed and breakfast (e.g., lodging houses)


Building Planning and Construction

Chapters 3-10

29

Changes in Chapter 3Building Planning

Section R301.2.1 Wind design criteria

The requirement for high-wind speed design where the basic wind speed is equal to or greater than 100 mph in hurricane prone regions has been deleted. The prescriptive wind load provisions of the code now apply where the basic wind speed is less than 110 mph for all regions of the country.


Figure R301.2(4)A Basic wind speedsThe basic wind speed map has been replaced by a new map based on the ASCE 7-10 wind speed map. Over the past 10 years, new data and research has been performed that indicated that the hurricane wind speeds provided in the maps of the previous editions of the IRC and ASCE- 7 are too conservative and needed to be adjusted downward. Significantly more hurricane data have become available thereby allowing for substantial improvements in the hurricane simulation model that is used to create the wind speed maps.


Figure R301.2(4)B Regions where wind design is required (NEW)

A new map has been added that indicates where high-wind design is required. This map generally corresponds to areas where the basic wind speed is 110 mph or greater.This is consistent with the text revisions in Section R301.2.1 that limit the prescriptive provisions to areas with wind speeds of less than 110 mph.


Figure R301.2(4)C Wind-borne debris regions (NEW)

This new map has been added that indicates wind-borne debris regions and provides Wind Zones to establish the missile types for use in the wind-borne debris tests. The definition for windborne debris region also has been revised to delete references to wind speed and proximity to the coast in favor of referencing the new map.


Section R301.2.1.2 Protection of openings

This section has been revised to clarify that protection from windborne debris is required for all exterior glazing in a building, not just windows. The wind zones shown in new Figure R301.2(4)C is to be used to establish the missile types for use in the ASTM E1996 wind-borne debris tests.

continued


Section R301.2.1.2 Protection of openings

The exception allowing the use of 7/16-inch wood structural panels to protect glazed openings is revised to limit the application to Wind Zones 1 and 2 as shown in new map Figure R301.2(4)C. Previously this exception was limited to windborne debris regions with wind speeds not greater than 130 mph. This exception is not permitted in some regions where previously allowed. This exception is not permitted in regions, now shown as Zone 3, such as New Orleans, Mobile Bay and South Florida.


Figure R301.2(2) Seismic Design Categories—Site Class D

The Seismic Design Categories (SDC) maps have been replaced by new maps based on the U.S. Geological Survey (USGS) updates to their seismic hazard data and ground motion attenuation formulas. The new IRC SDC maps are different from earlier versions in that the division between Seismic Design Categories D2 and E has been changed from 118% g to 125% g.

continued


Figure R301.2(2) Seismic Design Categories—Site Class D

The result of this change and the improved seismic hazard data generated by the USGS over the past 10 years is that the geographic region affected by the Seismic Design Category E designation is smaller. This occurs primarily in the region around Charleston, South Carolina, but is also evident in Seismic Design Category E regions in other parts of the United States.


Section R302.1 and Table R301.1(2) Exterior Walls (NEW)

This section has been revised to add a new table, Table R302.1 (2), for minimum fire separation distance for dwellings equipped throughout with an approved automatic sprinkler system. The new table generally puts the code back where it was in 2000 and 2003 and provides for reducing the fire separation distance for non-rated exterior walls from 5 feet to 3 feet. The existing table is retained and requires 5 feet fire separation distance for nonsprinklered buildings.


Section R302.2.2 Parapets

The exception to Items 1 and 2, which permits a parapet to not be installed, has been revised to prohibit openings and penetrations of the roof within 4 feet of the separating wall between townhouse dwelling units.


Section R302.5.1 Opening protection

This section has been revised to require self-closing devices for the doors between the garage and dwelling unit.


Section R303.1 Habitable rooms

Exception 1, permitting glazing to not be openable, has been revised such that a whole-house mechanical ventilation system is the only option. The whole-house mechanical ventilation system must be installed in accordance with new Section M1507.3.


Section R303.4 Mechanical ventilation (NEW)

This new section requires a whole-house ventilation system when a house has been tested with a blower door under prescribed criteria. If the blower door test required by Section N1102.4.1.2 indicates that the infiltration rate is less than 5 ACH 50, the dwelling must be provided with whole-house mechanical ventilation.

continued


Section R303.4 Mechanical ventilation (NEW)

This section applies whether or not the natural ventilation provisions of Section R303.1 are applied. In other words, the requirement of this section is in addition to the provisions of Section R303.1.

Note exception #1 to Section R303.1.


Section R303.5.1 Intake opening

The revision to this section increases from 2 feet to 3 feet the minimum vertical clearance that an intake opening must be below a contaminant source.


Section R308.4 Hazardous locationsThe provisions for hazardous locations related to the installation of glazing have been reorganized for ease of use and consistent application. Each item in the numbered list of hazardous locations has been placed in a separate subsection and given a descriptive title. Previously there were eight items and now there are seven subsections. Previous Items 5 and 6 are combined into new subsection R308.4.5.


Section R308.4.5 Glazing and wet surfacesThe separate provisions, previous Items 5 and 6, regulating glazing near tubs and swimming pools, have been consolidated into this new subsection. The requirements for safety glazing in the vicinity of a bathtub are now the same as the requirements for safety glazing in the vicinity of a hot tub, spa, whirlpool, or swimming pool. Because of the presence of water, all of these locations represent slip hazards and need safety glazing to prevent injury in case of a fall.


Section R308.4.6 Glazing adjacent stairs and rampsThis section has been revised to change the criteria for hazardous location of glazing adjacent to stairways. Satisfying any one of the following three conditions means the glazing at the side of the stairs is not considered in a hazardous location and therefore does not require safety glazing: The bottom exposed edge of the glazing is not

less than 36 inches above a walking surface of a tread.

continued


Section R308.4.6 Glazing adjacent stairs and ramps

The glazing is at least 36 inches from the edge of the stairway measured horizontally.

A rail (typically a handrail) meeting the loading and dimension requirements is installed at a height of 34 to 38 inches.


Section R308.4.7 Glazing adjacent bottom stair landing

This section has been revised to change the criteria for hazardous location of glazing installed near the landing at the bottom of a stairway. The threshold for the minimum height above the walking surface is revised from 60 inches to 36 inches for determining that the glazing is not in a hazardous location.

continued


Section R308.4.7 Glazing adjacent bottom stair landingSatisfying any one of the following three conditions means the glazing adjacent to the bottom stair landing is not considered in a hazardous location and therefore does not require safety glazing: The bottom exposed edge of the glazing is 36

inches or greater above the walking surface. The glazing is greater than 60 inches from the

nosing of the bottom tread of the stairway measured horizontally.

A guard and a horizontal clearance of 18 inches between the guard and the glazing.


Section R309.5 Garage fire sprinklers (NEW)This new section adds provisions to permit non-fire-rated exterior walls and projections for garages with zero clearance to a lot line. In a subdivision where all homes are protected with dwelling fire sprinkler systems, non-rated exterior walls of garages are permitted to be constructed on a lot line when the garage is protected with a fire sprinkler system and meets the other conditions of Section R302.1.


Section R310.2.2 Drainage (NEW)

This new section requires window wells serving emergency escape and rescue openings to be designed to direct surface water to the foundation drainage system.


Section R311.7.6 Landings for stairwaysThis section has been revised to permit shapes other than square or rectangular, such as angular or curved, landings.

Landings traditionally have been considered to be square or rectangular with a minimum dimension of 36 inches in both directions. The angular or curved landing is permitted to be less than 36 inches in the direction of travel if the prescribed depth is provided at the walk line and minimum area criteria are satisfied. In this case, the landing is not considered a winder.


Section R312.2 Window fall protection (NEW)This new section has been added to relocate the provisions for window fall protection from Chapter 6 to Chapter 3. Window fall protection is consistent with guards and this change intends to assist code users by placing these provisions with the guard provisions. This section has been revised to delete the prescriptive criteria for the installation and operation of window opening limiting devices.

The term is now changed to “window opening control device” and the installation and operation is specified in ASTM F 2090.


Section R314.5 Interconnection (NEW)

This new section has been added to move the interconnection provisions out of the sections related to location and power source. Wireless smoke alarms are now specifically approved for satisfying the interconnection requirements for both new and existing dwellings. Wiring is not required to achieve interconnection of two or more wireless smoke alarms.


Section R315.2 Carbon monoxide detection systems (NEW)This new section has been added that permits the installation of carbon monoxide (CO) detection systems that include CO detectors and audible notification appliances. The CO detection system must be listed and maintained to ANSI/UL 2075 and installed in accordance with NFPA 720. NFPA 720 requires CO devices to be installed on every level of a dwelling unit, including basements, as well as outside each separate dwelling unit sleeping area in the immediate vicinity of the bedrooms.


Knowledge Review

2. When is whole-house mechanical ventilation required?

When the measured infiltration rate is less than 5 ACH 50.


Knowledge Review

3. Under what conditions will glazing adjacent to stairways not be required?

A. The bottom exposed edge of glazing is not less than 36 inches above the walking surface of a tread.

B. The glazing is at least 6 inches from the edge of the stairway, measured horizontally.

C. A rail meeting the loading requirements is installed at a height of 34 to 38 inches.

D. Any of the above.


Changes in Chapter 4 Foundations

Section R403.1.3 Seismic reinforcing

Plain concrete footings for foundation walls of detached one- and two-family dwellings in Seismic Design Categories D0, D1, and D2 is no longer permitted. This was deleted from the exception to the provisions for seismic reinforcing of concrete footings in SDC D0, D1, and D2.


Section R404.1.9 Isolated masonry piers (NEW)

This new section has been added that provides prescriptive requirements for the construction of isolated masonry pier foundations supporting raised floor systems.


80

Hollow concrete masonry units grouted solid


Section R405.1 Concrete or masonry foundations

A filter membrane is now required for perforated foundation drains.


Knowledge Review

4. In which seismic zones has the use of plain concrete footings been eliminated?

D0, D1, and D2


Changes in Chapter 5 Floors

Section R501.3 Fire protection of floors (NEW)

This new section has been added that requires all floor assemblies, not fire rated, to be protected on the underside with ½-inch gypsum board, 5/8-inch wood structural panels or equivalent.

This will apply mainly to floor assemblies located over non-sprinklered areas, such as crawl spaces used for storage or containing fuel-fired appliances.

continued


Changes in Chapter 5 Floors

Section R501.3 Fire protection of floors (NEW)

There are 4 exceptions provided that specifies where the protection is not required.

This change adds protection to floors of lightweight construction that will provide the occupants additional time for self evacuation and safety for firefighters performing search and rescue.


Section R502.1.3 End-jointed lumber

This section adds the requirement that end jointed-lumber used in fire-rated assemblies must have “Heat Resistant Adhesive” or “HRA” in the grade mark. Sections R602.1.1 and R802.1.2 were also revised to add this requirement.


Section R507 Decks

Deck provisions have been relocated to a new section that consolidates the provisions for deck construction. The placement of bolts and lags for deck ledger attachment to the band joist has been revised to correlate with the National Design Specification (NDS) for Wood Construction. A new table and figures have been added, specifying the placement and minimum edge distances for bolts and lags for the ledger and band joist.


Changes in Chapter 6 Wall Construction


Same as Section R502.1.3.


Table R602.3(1) Fastener Schedule for Structural Members

The nailing of rafter or roof truss to the top plate is revised to provide a 200 pound maximum uplift capacity where the rafter or truss is spaced not more than 24 inches on center. The nailing now requires 3-16d box nails rather than 2-16d nails. A new Item 8 is added that requires all abutting studs at intersecting wall corners to be face nailed with 16d nails at 12 inches on center. A new Item 26 is added that requires all rim joist or blocking to sill plate to be toe nailed with 8d nails at 6 inches on center.


Section R602.7 Headers

The code now includes prescriptive provisions for single member headers under limited conditions. The revision to Section R602.7 allows single headers under limited loading conditions to increase energy efficiency of the dwelling. Installation of a single header results in a greater thickness of cavity insulation to reduce heat loss through the header in exterior walls.


Section R602.10 Wall bracing

The wall bracing provisions have been reorganized to provide a user friendly flow to the code text. Sub-sections now discuss one topic; it is no longer necessary to read multiple sections for information on a single topic. Some technical changes were also made. A new section has been added that provides a simplified method for wall bracing that is an easy, prescriptive procedure that is applicable to the majority of wood frame construction throughout the United States.


Section R602.10.1 Braced wall lines

This section has been reorganized to address braced wall lines only. Information about braced wall lines (BWL)—length, spacing, and orientation—is now in one section. Braced wall panel information has been moved to Section R602.10.2.


Section R602.10.2 Braced wall panels

This code change places information on braced wall panels into one section. The definition of a braced wall panel, information on braced wall panel location, and the minimum required number of braced wall panels in a wall line are now consolidated in this section. Braced wall panel location has been simplified. Braced wall panels now may be placed up to 10 feet from both ends of the braced wall line.

continued


Section R602.10.2 Braced wall panels

The maximum distance between two braced wall panels is now measured from edge to edge. Previous codes measured braced wall panel distances from center to center. Braced wall panel spacing of 25 feet on center is now a distance of 20 feet edge to edge. Braced wall lines up to 16 feet in length may have one braced wall panel when it is at least 48 inches long.


Section R602.10.3 Required length of bracing

As part of the extensive reorganization of the wall bracing requirements, the provisions for determining the minimum required length of wall bracing for all buildings, are now consolidated into this section. The footnotes, containing adjustment factors, to the wind wall bracing table have been deleted and placed in a separate table, Table R602.10.3(2).


Section R602.10.4 Construction methods for braced wall panels

This section groups bracing construction methods and the allowable mixing of bracing methods into a single section. Braced wall lines which change from exterior to interior wall lines may now mix bracing methods along the braced wall line. New Table R602.10.4, Bracing Methods, now includes both intermittent and continuously sheathed bracing methods.


103

(Partial)


Section R602.10.5 Minimum length of a braced wall panel

This section places the minimum length requirements of a braced wall panel for different bracing methods into one section. Braced wall panel minimum lengths are placed into one table for clarity. Tables R602.10.3.1, R602.10.3.2, R602.10.4.2 and R602.10.5.2 are combined into Table R602.10.5.


105

(Partial)


Section R602.10.6 Construction of methods ABW, PFH, PFG, CS-PF and BV-WSP

This revision places all of the alternate braced wall panel methods into this section and adds a new method BV-WSP, Wall Bracing for Dwellings with Stone and Masonry Veneer in Seismic Design Categories D0, D1 and D2. This section consolidates the alternate braced wall panel methods for intermittent and continuously sheathed braced wall lines together. A reference to the figure for each alternate bracing method replaces the majority of the text descriptions of the methods.

continued


Section R602.10.6 Construction of methods ABW, PFH, PFG, CS-PF and BV-WSP

All methods now use a figure only to show construction requirements. The intent of this change is to simplify the code by removing redundant language and recognizes that technical information such as nail, connector, strap and framing member sizes and location are more clearly illustrated in a graphic format rather than lengthy text descriptions.


Section R602.10.6 Wall bracing for dwellings with stone and masonry veneer

This revision relocates the information on wall bracing with stone or masonry veneer from Section R602.12 to Section R602.10.6.5 and defines a new method, BV-WSP, Wall Bracing for Dwellings with Stone and Masonry Veneer in Seismic Design Categories D0, D1 and D2. Method BV-WSP is applicable when stone or masonry veneer is applied to a height greater than the first story on a detached one- or two-family dwelling located in SDC D0, D1 or D2.

continued


Bracing for townhouses under these conditions requires a design in accordance with accepted engineering practice. No additional bracing is required in any seismic design category when the height of the veneer is less than or equal to the height of the first story.

109Handout page 8

Section R602.10.6 Wall bracing for dwellings with stone and masonry veneer


Section R602.10.7 Ends of braced wall lines with continuous sheathing

This revision adds a new end condition for braced wall panel connections when using continuous sheathing. When a 48-inch braced wall panel is at the end of a wall line, the intersecting wall line does not require a return panel or hold-down at the corner. The end conditions in Figures R602.10.4.4(2), R602.10.4.4(3), R602.10.4.4(4), and R602.10.4.4(5) has been combined into new Figure R602.10.7.


112

End conditions for braced wall lines with continuous sheathing


113



114



Section R602.12 Simplified wall bracing (NEW)

A new section has been added that provides a simplified method for wall bracing that is an easy, prescriptive procedure that is applicable to the majority of wood frame construction throughout the United States. This provision is an alternate to the traditional wall bracing provisions of Section R602.10 and combining the two methods is not permitted.

continued



It is limited to basic wind speed of 90 mph, Exposure Category A or B and Seismic Design Categories A or B, or in SDC C for detached one-and two-family dwellings. There are six additional conditions the building must meet in order to qualify for the simplified wall bracing as follows: Limited to two stories with concrete or masonry

foundation.continued



Floor cantilever maximum length of 24 inches beyond the foundation or bearing wall.

Wall height a maximum of 10 feet. Roof eave to ridge height of 15 feet. All exterior walls have ½-inch gypsum board on

the interior side. No cripple walls in a two-story building.


Section R602.12.1 General

This change adds a new reference standard, TMS 403-10, Direct Design Handbook for Masonry Structures. The new standard provides a simplified design method for single story concrete masonry buildings.


Section R613.2 Applicability limits

The maximum design wind speed, applicable to the prescriptive provisions of SIP construction, has been reduced from 130 mph, exposure A, B or C to120 mph, exposure A or B and 110 mph exposure C.


Tables R613.5(1) and R613.5(2)Minimum Thickness for Sip Walls

The existing tables have been deleted and replaced with new tables. The new minimum thickness for SIP walls were developed based on more stringent criteria by not allowing any load duration increase, including wind load, for SIPs.


Knowledge Review

5. Under what conditions can the Simplified Method of Wall Bracing be used?


Knowledge Review Basic wind speed of 90 mph, Exposure Category A or B. Seismic Design Categories A or B, or in SDC C for

detached one- and two-family dwellings. Limited to two stories with concrete or masonry foundation. Floor cantilever maximum length of 24 inches beyond the

foundation or bearing wall. Wall height a maximum of 10 feet. Roof eave to ridge height of 15 feet. All exterior walls have ½ -inch gypsum board on the interior

side. No cripple walls in a two-story building.


Changes in Chapter 7 Wall CoveringSection R702.7 Vapor retarders

This section has been relocated from Section R601.3. Table 702.7.1 was revised to delete OSB and plywood and replaced with wood structural panels.


Section R703.7.3.2 Allowable span

This section was revised to add a new table setting the minimum and maximum heights of veneer above the opening. A minimum height of veneer above the opening is necessary to adequately transfer the loads to the walls supporting the lintel on each side of the opening. The maximum height of veneer above the opening also is limited and is determined in part by the configuration of the roof.


Section R703.7.4 AnchorageThis section was revised to specify the fastener for attachment of ties to wood or cold-formed steel backing. The minimum fastener size is specified for each Seismic Design Category. A new table was added placing the tie fastener and air space requirements for anchored veneer into a table for ease of use. The veneer tie maximum horizontal spacing has changed from 24 inches to 32 inches for consistency with Building Code Requirements and Specification for Masonry Structures (TMS 402/ACI 530/ASCE 5).


Section R703.7.4.3 Grout fill

This section was revised to prohibit mortar to be used to fill the air space behind anchored masonry veneer.


Section R708.3 Flashing

This section has been revised to provide several alternatives for the installation of flashing at window and door openings. Pan flashing, a newly defined term in the code, is now required for window and door openings when flashing details are not provided by the manufacturer.

continued


Sections R703.12.1 Clearances andR703.12.2 Flashing at foundation (NEW)

These new sections add minimum clearance and flashing requirements to apply to the base of adhered masonry veneer on exterior walls.


Section R708.3 FlashingAny one of the following criteria may apply for flashing at window and door openings: the fenestration manufacturer’s installation and

flashing instructions. the flashing manufacturer’s instructions. pan flashings required when instructions not

provided. design or method of a registered design

professional. other approved methods.


Knowledge Review

6. What type of flashing is required for windows when the manufacturer’s instructions do not provide requirements for flashing?

Pan flashing


Changes in Chapter 8Roof-ceiling Construction


Same as Section R502.1.3.


Section R802.7.1 Sawn lumber

This section has been revised to move the provisions on cantilever portions of rafters from the exception into a new subsection and a new figure is added to clarify the application. An actual dimension of 3½ inches replaces a nominal 4-inch dimension in describing the portion of rafter remaining after notching at the wall top plate.


Section R802.7.1.2 Ceiling joist taper cut (NEW)

This new section adds the provisions for the limits for taper cuts on the ends of ceiling joists. A new figure was added to aid in determining the correct application of ceiling joist taper cut requirements.


Section R802.11 Roof tie-down

This section has been extensively revised and substantially improves the roof uplift provisions. The nailing, in Table R602.3(1), of rafter or roof truss to the top plate is revised to provide a 200-pound maximum uplift capacity where the rafter or truss is spaced not more than 24 inches on center.

The uplift connector table is replaced with a new table that accounts for reduction in uplift loads that occur on higher slope (5:12 pitch or greater) roofs or hip roofs in accordance with the current ASCE 7.

continued


Section R802.11 Roof tie-downWhere rafter or truss spacing does not exceed 24 inches on center, the prescriptive connection requirements of Table R602.3(1) are permitted to be used under either of the following conditions: where the uplift force does not exceed 200 pounds; or where the roof pitch is 5:12 or greater and all of the

following criteria are met:90 mph wind speed.exposure category B.maximum building width of 32 feet.maximum roof overhang of 24 inches.

continued141Handout page 102012 IRC Update with Maryland Amendments

Section R802.11 Roof tie-down

These new provisions will allow the use of nailing rather than a manufactured uplift connector for more cases than allowed previously.


Section R806.2 Minimum vent areaThe provisions for minimum vent area have been revised by placing two exceptions after the general rule to clarify the meaning. The exception for reducing the ventilation area when a vapor retarder is installed on the ceiling now only applies to cold-weather climates. The reduction in vent area based on cross ventilation now requires no less than 40 percent and no more than 50 percent (previously 50 and 80 percent) of the required ventilating area to be placed in the upper portion of the roof and no more than 3 feet below the ridge. The requirement for the upper vents to be at least 3 feet above the eave vents has been removed.


Section R806.5 Unvented attic and unvented enclosed rafter assemblies

This section was revised to add text that clarifies that the unvented attic provisions also apply to rafter assemblies typically used for vaulted or cathedral ceilings. References to vapor retarders now specify the applicable class as defined in Section R202. A new sentence clarifies that insulation board installed as an air-impermeable barrier must have the edges sealed to provide a continuous barrier.


Changes in Chapter 9Roof Assemblies

Section R905.2.7.2, et al Underlayment and high wind (NEW)

Sections R905.2.7.2 and R905.3.3.3 have been revised to add requirements for installation of roof covering underlayment for high wind areas where the basic wind speed is equal to or greater than 120 mph.

continued


Changes in Chapter 9Roof Assemblies

Section R905.2.7.2, et al Underlayment and high wind (NEW)

New sections for underlayment and high wind have been added for metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles, wood shakes and metal roof panels.


Section R905.2.8.5 Drip edge (NEW)

This new section adds the requirement for a roof drip edge for asphalt shingles and provides direction for its proper installation.


Section R907.3 Recovering versus replacement

This section has been revised to delete the requirement that prohibited a second layer of asphalt shingles in areas of moderate or severe hail exposure. Section 903.5, the hail exposure map, and related definitions have been deleted from the code.


Section R905.16 Photovoltaic modules/shingles (NEW)

This new section adds provisions for material and installation of photovoltaic modules/shingles. These shingles are integrated with the building and provide a roof covering and source of electrical power.


Changes in Chapter 10Chimneys and Fireplaces

Section R1003.9.1, Chimney caps (NEW)

This new section adds the requirement for a chimney cap on a masonry chimney. The minimum criteria for the installation of the chimney cap are prescribed.


Section R1003.9.3 Rain caps (NEW)

This new section does not require a rain cap, but where one is installed, provides the minimum criteria for installation.


Section R1005.7 Factory-built chimney offsets (NEW)

This new section adds provisions for offsets in factory-built chimneys. The chimney must be installed so that no portion of the chimney exceeds an angle of 30 degrees from vertical. The code also limits the number of offsets by setting the maximum number of elbow fittings to four.


Energy EfficiencyChapter 11

156

Changes in Chapter 11Energy Efficiency (NEW)

The contents of Chapter 11 are now extracts from the applicable provisions of the 2012 International Energy Conservation Code.


Section N1102 Building Envelope Requirements (NEW)

The tables for building envelope values (R-values, U-factors, Solar Heat Gain Coefficient) have been made considerably more stringent from the 2009 Edition of the code. Some estimates are that the energy conservation measures have increased by 15% over the 2009 values.


Section N1101.12.3 Fenestration product rating (NEW)

Values for visual transmittance of glazing are now included in the code.


Section N1102.2.3 Eave baffle (NEW)

A baffle is now required in the attic adjacent to soffits when air-permeable insulation is installed.


Section N1102.4.1 Building test (NEW)

Air leakage testing is now required in all buildings.


Section N1105 Simulated Performance Alternative (NEW)

A simulated performance alternative is now available for buildings constructed in accordance with the IRC.


MechanicalChapters 12-23

163

Changes in Chapter 13 General Mechanical System Requirements

Section M1301.5 Third-party certification and testing (NEW)

Piping, tubing, and fittings used in mechanical systems must now be tested by an approved third-party testing agency or be certified by an approved third-party certification agency.


Changes in Chapter 15 Exhaust Systems

Section M1502.4.2 Duct installation

Dryer ducts can now be fastened together with screws or similar fasteners that protrude not more than 1/8 inch into the inside of the duct.

Note that Section G2439.5.2 for gas dryers does not permit such fasteners.


Section M1502.4.4.1 Specified length

The maximum allowable dryer duct length is now 35 feet (consistent with Section G2439.5.5.1).


Section M1507.3 Whole house mechanical ventilation system (NEW)

Where a blower door test of the building indicates that the infiltration rate is less than 5 ACH50, the dwelling must be provided with whole-house mechanical ventilation.

See Section R303.4.


Changes in Chapter 16 Duct Systems

Section M1600.1.1 Above-ground duct systems

Stud wall cavities in the outside walls of a building cannot be utilized as return air plenums.


Changes in Chapter 23 Thermal Solar Energy Systems

Section M2302 Photovoltaic solar energy systems (NEW)

New section added to provide requirements for the design, construction, installation, alteration, and repair of photovoltaic equipment and systems.


172

Photovoltaic solar energy system


Fuel GasChapter 24

173

Changes in Chapter 24 Fuel Gas Section G2411.1.1 CSST

The bonding requirements for gas piping systems with corrugated stainless steel tubing (CSST) sections have been relaxed to allow the bonding jumper to connect to a metallic pipe or fitting anywhere between the point of delivery and the first CSST fitting.

This section applies where any amount of CSST is used in a gas piping system.


Section G2412.10 Third party testing and certification (NEW)

Gas piping, tubing, and fittings must be tested by an approved third-party testing agency or be certified by an approved third-party certification agency.


Section G2417.7 Purging

A new gas pipe purging procedure has been put into the code.


Section G2421.4 Excess flow valve (NEW)

Excess flow valves are now addressed in the code.

EXCESS FLOW VALVE (EFV). A valve designed to activate when the fuel gas passing through it exceeds a prescribed

flow rate.


Section G2428.2.9 Chimney and vent locations

Where vents extend above the roof a specified distance, the code now requires such vents to be protected by an insulated enclosure or be an engineered system.


Section G2428.2.17 Height entries

Where the actual height of a vent falls between entries in the height column of the applicable table in Tables G2428.2(1) through G2428.3(4), either interpolation must be used or the lower appliance input rating shown in the table entries must be used for FAN MAX and NAT MAX column values and the higher appliance input rating must be used for the FAN MIN column values.


Section G2454.1 General (NEW)

Permanently fixed-in-place outdoor decorative appliances must be tested in accordance with ANSI Z21.97 and must be installed in accordance with the manufacturer’s instructions.


184

Figure G2454.1Outdoor Campfire


PlumbingChapters 25-33

185

Changes in Chapter 25 Plumbing Administration

Section P2503.5.1 Rough plumbing

Language was added to make it clear that plastic DWV piping must not be tested with air because of the risk of injury to personnel.


Knowledge Review

7. Can all types of DMV piping material be tested with air pressure?

No. Only non-plastic water distribution piping can be tested using air pressure.


Changes in Chapter 26 General Plumbing Requirements

Section P2601.2 Connections to drainage system

An exception was added to allow gray water producing fixtures to be connected to a gray water collection system where a gray water recycling system is to be installed.


Section P2603.4 Pipe through foundation walls

The requirement for a pipe sleeve or a relieving arch for pipes passing under a footer was removed because the footer acts as the relieving arch for the pipe below.


Section P2606.1 Sealing of annual spaces (NEW)

A new section was created to consolidate all of the sealing requirements.


194

Figure P2606.1Sealing of Annular Spaces


Table P2609.4 Third party testing and certification (DELETED)

For ease and simplicity of enforcement, all plumbing products and materials must now be listed by a third party agency and as part of that listing, the product or material will have a mark that indicates listing by the third party. Table P2604.8 is no longer needed.


Changes in Chapter 27 Plumbing Fixtures

Section P2706.1 General

In addition to waste receptors being prohibited from being in bathrooms, they are now prohibited from being in plenums, crawl spaces, attics, interstitial spaces above ceilings and below floors. Waste receptors in those locations can dry out or overflow without knowledge of the occupants. Clothes washer standpipes are now allowed in bathrooms.


Section P2709.1 Construction

Low height thresholds allowed for shower receptors.


Section P2709.2 Lining required

Shower lining material is only required to extend 2 inches above the threshold instead of three inches (in order to be consistent with the same IPC requirement).


199

Shower liner extensions


Sections P2709.2.1 and P2709.2.2 PVC and CPE sheet materials

The thickness requirement was deleted because the puncture testing of ASTM D4551 and D4068 indicates that thinner materials can pass the puncture test and some 0.040 inch thick (or thicker) materials cannot pass the puncture test. Thus, thickness is not a measure of quality.


Section P2709.2.4 Liquid-type, trowel-applied, load-bearing, bonded water proof materials (NEW)

This is a new method for creating a waterproof shower pan lining that does not involve the application of sheet materials.


Section P2713.1 Bathtub waste outlets and overflows

Section language rewritten to make it clear that waste overflows are required for bathtubs.


Section P2722.5 Water closet personal hygiene devices

Standard ASME A112.4.2 was added to the code to cover specialized water closets or water closet seats having sprays for personal hygiene.


Changes in Chapter 28 Water Heaters

Section P2801.5 Required plan

Language revised to clarify that drain pans are required only for storage tank type water heaters or hot water storage tanks.


Knowledge Review

8. Do tankless water heaters require a drip pan?

No.


Changes in Chapter 29 Water Supply and Distribution

Section P2901.1 Potable water required

Wherever nonpotable water systems are installed, the piping must be identified. This includes piping installed outside the building either above or below ground.


Section P2904.1 General

Partial fire sprinkler systems are allowed to be installed only in buildings that do not require complete fire sprinkler coverage.


Table P2905.4 Water Service PipeTable P2905.5 Water Distribution PipeTable P2905.6 Pipe Fittings

Polyethylene of Raised Temperature (PE-RT) tubing is added to the code.


Knowledge Review

9. Can a partial fire sprinkler system be installed in a residential building?

Yes, but only where the residential building is not required to have a complete fire sprinkler system.


Changes in Chapter 30 Sanitary Drainage

Section P3003.19 Joints between drainage piping and water closets

A new type of water closet drain connection is added to this section.


Section P3007.3.3.1 Materials (NEW)

Materials specified to be either brass, copper, CPVC, ductile iron, PE or PVC.


Section P3007.3.3.2 Ratings (NEW)

Piping must be rated for the maximum discharge pressure and temperature.


Section P3007.3.5 Ejector connection to the drainage system

220Handout page 24

Pumps connected to the drainage system can now connect to a building sewer, building drain, soil stack, waste stack or horizontal branch drain. For a connection near the base of a stack or near a future drain, the distance has been reduced from 10 feet to 10 stack diameters.


Section P3009 Gray Water Recycling Systems (NEW)

Gray water recycling system requirements have been added to the code (eliminating Appendix O).


Knowledge Review

10. Can fixtures can discharge to a gray water recycling system?

Bathtubs, showers, and lavatories.


Changes in Chapter 31 Vents

225Handout page 25

Section P3103.5 Location of vent terminal

Vertical distance increased from 2 feet to 3 feet to coordinate with similar requirements for vent terminal requirements in the mechanical section of the code.


226

Location of vent terminal


Section P3103.4 Prohibited use

227Handout page 25

Vent terminals are prohibited from being used for any purpose other than venting even if the vent terminal is anchored.


Section P3111.2 Installation

228Handout page 25

The term, drain, was changed to waste. The term drain implied that fecal matter might be drained by the system but only waste is allowed to be carried by CDV systems.


Knowledge Review

11.Can a vent terminal be used for mounting a television satellite dish?

No


ElectricalChapters 34-43

230

Changes in Chapter 36 Services

231Handout page 25

Section E3608.4 Supplemental electrode required

This section was completely reorganized to make supplemental grounding electrodes the rule, with an exception for those having a resistance of less than 25 ohms to earth.


Changes in Chapter 39 Power and Lighting Distribution

233Handout page 25

Section E3901.11 Foyers (NEW)

The code was formerly silent on receptacle requirements for foyers which can be quite large and contain electrical plug-loads.


Section E3902.13 Arc-fault circuit interrupter protection (NEW)

234Handout page 25

New requirements were added to address arc-fault circuit interrupter protection for existing wiring that is modified, extended or replaced.


Section E3905.8 Boxes at fan outlets

235Handout page 25

A new rule requires fan-rated boxes where switched conductors are provided, suggesting the future installation of paddle fans.


Changes in Chapter 40 Devices and Luminaires

237Handout page 25

Section E4001.15 Switching controlling lighting loads (NEW)

A new section requires that a ground circuit conductor be provided in all switch boxes to accommodate devices that consume power, such as timers and automated lighting controllers. Exceptions address locations where adding the conductor at a later date is readily accomplished.


For more information Significant Changes to the

International Residential Code, 2012 Edition. Book 6-hour classroom training

There is also a 3-hour classroom IRC update course available.


Maryland Codes Administration

240

100 Community PlaceCrownsville, MD 21032410-514-7220 or 1-800-756-0119Maryland Code Administration Information Portal http://mdcodes.umbc.edu/

Ed LandonDirector, Codes Administration100 Community PlaceRoom 3.641Crownsville, MD [email protected] 410-987-8902

Ujjval Dave, P.E.Manager, Design Standards and ReviewIndustrialized Building and Manufactured Homes ProgramMaryland Building Performance Standards Program 100 Community PlaceRoom 3.627Crownsville, MD [email protected] 410-987-8902


http://mdcodes.umbc.edu/

http://mdcodes.umbc.edu/

mailto:[email protected]

241

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242

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