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What’s new in the 2015 Residential IECC/IRC?
1 DiSanto Builders
ICF Specialist
City of Scottsdale IECC Adoption Effective Date – January 1, 2017
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Building thermal envelope must be represented on the
construction documents easily depicted on floor plan
and building sections
Information for Construction Documents
2015 IECC/IRC Major Residential Changes
2 N1101.5.1 (R103.2.1)
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Sequence of Inspections Footing and foundation Framing and rough-in Plumbing rough-in Mechanical rough-in Final inspection
Enhanced Inspections
2015 IECC/IRC Major Residential Changes
Recognition of third-party inspection agencies not affiliated with the building design or construction
R104.2
Adv
anta
ge In
spec
tion
Serv
ice
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2015 IECC/IRC Major Residential Changes
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Not exceeding 5 air changes per hour for detached dwelling units Not exceeding 7 air changes per
hour for attached dwelling units (Scottsdale amendment)
N1102.4.1.2 (R402.4.1.2)
2015 IECC/IRC Major Residential Changes
Building or dwelling unit shall be tested and verified for Climate Zone 2 as having an air leakage rate -
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2015 IECC/IRC Implementation and Compliance
R104.4 Approved Inspection Agencies The code official is authorized to accept reports of third-party inspection agencies not affiliated with the building design or construction.
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Supply and Return Duct Insulation
N1103.3.1 (R403.3.1)
Building framing cavities shall not be used as ducts or plenums
2015 IECC/IRC Major Residential Changes
Location 3 inches in diameter or greater
Less than 3 inches in diameter
In attics R-8 R-6
Other locations R-6 R4.2
Exception: Ducts located completely inside the building thermal envelope including air handling units (AHU)
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Service Hot Water Systems
2015 IECC/IRC Major Residential Changes
N1103.5.1.2 (R403.5.1.2)
• 21 feet for a 3/4 inch line • 32 feet for a 5/8 inch line • 43 feet for a 1/2 inch line • 50 feet for a 3/8 inch line or less
Heated water circulation systems shall be provided when the length of hot water piping or tubing from the source of hot water to the furthest fixture exceeds:
Section N1103.5.1.2 (R403.5.1.2) Circulation system piping.
Where the water piping or tubing length contains more than one size of pipe, the largest size shall be used for determining the maximum allowable length of pipe before a circulating hot water system is required.
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Demand-Controlled Hot Water Circulation
N1103.5.1.1 (R403.5.1.1)
Return line from the heated-water supply pipe to the heated-water source shall be a dedicated return pipe or a cold water supply pipe
Controls shall limit the temperature of water entering the cold-water piping to 104°F
Controls shall start the pump based on the identification of a demand for hot water within the occupancy
Controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water
2015 IECC/IRC Major Residential Changes
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Mechanical Ventilation Provide outside air ventilation per Table M1507.3.3(1) Shall consist of one or more supply or exhaust fans or a
combination of such, and associated ducts and controls
N1103.5 (R403.5) and M1507
2015 IECC/IRC Major Residential Changes
Outdoor air intakes shall have automatic or gravity dampers that close when ventilation system is not operating Notes: 1. Controls are required for supply-only
(air intake), exhaust-only and balanced systems with manual override
2. Exhaust-only systems only work when there is a fresh air inlet
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2015 IECC/IRC
N1103.5 (R403.5) and M1507
Mechanical Supplied Outside Air Ventilation
Ventilation options that meets the requirements of IRC M1507 for hot dry climates Option 1- Bathroom exhaust fan with make-up air inlet in
separate area Option 2 - Bathroom exhaust fan with make-up air inlet in
return air box Option 3 - Air Intake Duct to supply plenum
with inline fan Option 4 - Energy or Heat Recovery Ventilator
Note: These options range in cost, manufacturer & efficiencies.
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IMC Ventilation for R-2, R-3 and R-4 three stories or less and four stories or more Where the air infiltration rate in a dwelling unit is less than 5 air
changes per hour when tested with a blower door, the dwelling unit shall be ventilated by mechanical means in accordance with IMC Section 403
IMC 401.2 and 403.3
2015 IECC/IRC - IBC/IMC Major Residential Changes
Provide outside air ventilation per IMC Table 403.3.1.1
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R303.3 and M1507
2015 IECC/IRC Major Residential Changes
Bathroom Exhaust Exhaust fans in bathrooms with a shower or tub shall be
provided with a delay timer or condensation control sensor. except where functioning as a component of a whole house ventilation
system Exhaust fans shall be switched
separately from lighting systems Exhausts shall have automatic or
gravity dampers that close when the ventilation system is not operating
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2015 IECC/IRC Major Residential Changes
Compliance Paths
Prescriptive Performance Energy Rating Index (ERI) Compliance Alternative
N1106 (R406)
CLIMATE ZONE ENERGY RATING INDEX 1 52 2 571
3 51 4 54 5 55 6 54 7 53 8 53
TABLE N1106.4 (R406.4) MAXIMUM ENERGY RATING INDEX
1Energy generated from on-site renewable energy shall not be included in the calculation of the Energy Rating Index value.
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Must be provided with a vapor-retardant cover or other approved vapor-retardant means
N1103.10.4 (R403.10.4)
Exception: Where more than 70% of the energy for heating is from site-recovered energy such as heat pump or solar energy source
2015 IECC/IRC Major Residential Changes
Outdoor heated pools and permanent spas
Laguna Pools
Swim University
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• A minimum of 90% of the permanently installed lighting fixtures shall contain only high efficacy-lamps
N1104.1
• 60 lumens per watt for lamps over 40 watts
• 50 lumens per watt for lamps over 15 to 40 watts
• 40 lumens per watt for lamps 15 watts or less
Exception: Low-voltage lighting shall not be required to utilize high-efficacy lamps.
2015 IECC/IRC Major Residential Changes
Lighting Equipment Amendment
Cha
ndel
iern
light
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2015 IRC Residential Changes
Plumbing Fixture Flow Rates
Plumbing Fixture Maximum Flow Rates
Lavatory faucet 1.5 gpm at 60 psi
Shower head a 2.0 gpm at 80 psi
Sink faucet 2.2 gpm at 60 psi
Water Closet 1.28 gallons per flushing cycle c, d
a. A handheld shower spray shall be considered a shower head. b. Consumption tolerances shall be determined from referenced standards. c. 1.6 gallons per flushing cycle is permitted where a water closet is connected to a building’s existing sanitary drainage piping. d. For a dual-flush water closet, the effective flush volume is the composite, average flush volume of two reduced flushes and one full flush.
TABLE P2903.2 MAXIMUM FLOW RATES AND CONSUMPTION FOR
PLUMBING FIXTURES AND FIXTURE FITTINGS b
P2903.2
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2015 IECC/IRC Major Residential Changes
New Chapter/Section on Existing Buildings
Historic Additions Alterations Repairs Change of
Occupancy or use
houz
z
Arizona Architecture
N1107 (R501)
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2015 IECC/IRC Residential Changes
Solar Ready Provisions Solar-ready zone area
Not less than 300 sq. ft. exclusive of access and set back areas as required by the fire code
Free from obstructions, including but not limited to vents, chimneys and roof-mounted equipment
Main electrical service panel Reserved space for a dual pole
circuit breaker for future solar electric
Appendix U