how changes to the ibc affect high-performance design ... · 5/29/15 1 presented&by&...

5/29/15

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Presented by Walt Norko, PE, CCM

VP of Professional Prac>ce, CMAA

How Changes to the IBC Affect High-Performance Design & Construction

2015 IBC Code Changes

Learning Objec-ves: •  Iden>fy the significant 2015 updates to the Interna>onal Building Code®

•  Learn how the real-‐world applica>on of these code changes will affect High Performance Buildings in the future.

•  Discuss changes incorporated by the Interna>onal Energy Conserva>on Code (IECC).

•  Learn what impacts these 2015 IBC & IECC modifica>ons will make.

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•  What is a High Performance Building? •  NIBS -‐ A building that integrates and op>mizes on a life cycle basis all

major high-‐performance building aYributes, including energy (and water) conserva>on, environment, safety, security, durability, accessibility, cost-‐benefit, produc>vity, sustainability, func>onality, and opera>onal considera>ons. –  Energy efficient -‐ op>mizes energy performance and even producing

on-‐site renewable energy. –  Low impact on the environment – Assists with water conserva>on and

reclama>on, aids in land conserva>on, and u>lizes recycled content. –  Provides a healthy atmosphere for occupants – Improves indoor air

quality and allows for natural ligh>ng. –  Low life-‐cycle costs.


•  2015 Interna>onal Building Code Published – More than 2,200 proposed change proposals reviewed and adjudicated from the 2012 edi>on.

– Not all were accepted – The increase in change proposals par>ally driven by energy conserva>on proposals

– Based on broad principles – Establishes minimum regula>ons and not necessarily op>mal high performance standards.

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•  2015 changes to the IBC & IECC are moving in the right direc>on – Wider focus & holis>c approach – On design construc>on opera>ons – Moves beyond component by component approach in some areas

–  Energy uses covered – More outcome focused goals incorporated –  Consistency with ASHRAE Standard 90.1 & other standards


•  2015 changes to the IECC are different from the IBC and focusses on “the use and conserva>on of energy over the life of each building”

•  This diverts from the normal life safety & property protec>on aspects of other codes.

•  It incorporates & references other specific codes •  Consistency with ASHRAE Standard 90.1

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•  Specific IBC & IECC Code changes related to High Performance Buildings in the following areas. – New Defini>ons –  Indoor Environmental Quality –  Improved Building Envelopes – Building Energy Systems – Water Systems – Ligh>ng Systems


•  New Defini>ons –  Building-‐Integrated Photovoltaic (BIPV) Products –  Photovoltaic Panel System, Module –  Photovoltaic Shingles –  Radiant Barrier –  Vegeta>ve Roof –  Building Thermal Envelope – Daylight Responsive Control – Daylight Zone

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•  Indoor Environmental Quality – 1203.3 – Moisture control •  Cross ven>la>on required for afc spaces •  Unvented afc & unvented enclosed assemblies – Unvented afc space is within the building thermal envelope

– 1203.5 – Natural ven>la>on – 1205.2 – Natural ligh>ng


•  Improved Building Envelopes –  C303.1 – Building thermal envelope –  1405.3 – Vapor Retarders – types of retarders in each climate zone

–  1405.10 – Adhered masonry veneer –  1409.10 – High pressure laminates requirement –  C402.1 – Building thermal assemblies –  Insula>on in building thermal envelope opaque assemblies shall comply with Sec>ons C402.2.1 through C402.2.8 and Table C402.2.

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•  Improved Building Envelopes •  C402.1 – Building thermal assemblies –  The thermal resistance (R-‐value) of the insula>ng material installed below grade on exterior walls of the building envelope

–  Table C402.2 -‐ modifies the thermal envelope requirements for above-‐deck roof insula>on to be consistent with the recently revised ASHRAE 90.1

–  Radiant hea*ng system panels that are installed in interior or exterior assemblies shall be insulated with a minimum of R-‐3.5 on all surfaces not facing the space being heated.


•  Improved Building Envelopes –  C402.3.2 –  Separate analyses for ASHRAE 90.1 have shown top ligh>ng of larger open spaces to provide very cost effec>ve energy savings, and that the size threshold may be significantly reduced from the current 10,000 k2.

–  C402.3.3.5 -‐ Dynamic glazing shall be permiYed and this change addresses code compliance with ASHRAE 90.1 & other standards. Dynamic glazing represents a key technology on the route to zero energy buildings.

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•  Improved Building Envelopes –  C402.4 Air leakage (Mandatory) –  The thermal envelope of buildings shall comply with Sec>ons C402.4.1 through C402.4.8. Alterna>vely the building thermal envelope shall be permiYed to be tested in accordance with ASTM E779. This change clarifies the language pertaining to the sealing of penetra>ons in the building thermal envelope associated with con>nuous air barriers so that all three compliance op>ons associated with air barriers are equivalent.


•  Building Energy Systems –  Table C403.2.3 -‐ This change contains all of the increased equipment efficiency requirements found in Standard 90.1. Since that standard is an alterna>ve path to compliance and there is a desire to maintain equivalency with 90.1.

–  C403.2.3.1 -‐ For consistency with Standard 90.1. This change makes changes to the requirements for air and water cooled chillers as defined in sec>on C403.2.3.1 and the efficiency requirements listed in table C403.2.3(7).

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•  Building Energy Systems –  C403.2.4.5 New -‐ ASHRAE/IES Standard 90.1-‐2010, which is adopted by reference has a provision to provide the ability to create isola>on areas within zones under certain circumstances in order to allow for addi>onal reduc>ons in energy use and opera>ng costs.

–  C403.2.4.6 New, Economizer fault detec>on and diagnos>cs (FDD). –  C403.2.5.2, Enclosed parking garage ven>la>on controls. –  Table C403.2.6, This change revises the requirements for the use of exhaust air energy recovery as defined in table C403.2.6.


•  Building Energy Systems –  C403.2.7, This change reduces the energy loss associated with duct

systems, such as those in cold climates, by increasing the level of insula>on required on ducts and plenums where it is cost effec>ve.

–  C403.2.7.1.3, High-‐pressure duct systems, Consistency with the provisions of ASHRAE/IES Standard 90.1-‐2010, which is adopted by reference and has been revised to limit the air leakage rate to 4.0

–  C403.3.1.1.5, Economizer dampers. Dampers used in economizers shall comply with the requirements of Sec>on C402.4.5.2. Ensures that economizer intake dampers are low-‐leakage, and that the low-‐leakage ra>ngs are cer>fied to ensure the design intent and energy savings.

–  C403.4.1 Economizers. Each cooling system shall include either an air economizer in compliance with Sec>on C403.3.1.1 or water economizer in compliance with Sec>ons C403.4.1.1 through C403.4.1.4.

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•  Building Energy Systems –  C403.2.10.3, Fan efficiency -‐ Change addresses the minimum efficiency of air system fans and requires a fan efficiency grade (FEG) of at least 67.

–  C403.2.12, Refrigera>on equipment performance – This change addresses energy efficiency opportuni>es available from commercial refrigera>on and freezing equipment in compliance with ASHRAE/IES Standard 90.1-‐2010.


•  Building Energy Systems –  C403.4.5.4, Frac>onal HP fan motors – This change provides for Electronically Commutated Motors (ECM) to be used that are more efficient and cost effec>ve compared to standard (e.g. PSC) motors in applica>ons where the fan runs many hours per day (e.g. toilet exhaust fans, series fan powered VAV boxes, and fan-‐coil units) other than those in the airstream that operate only when hea>ng a space.

–  C405.8 Electrical motors (Mandatory). Electric motors shall meet the minimum efficiency requirements of Tables C405.8 (1) through C405.8 (4)

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•  Building Energy Systems – C406.1 -‐ Required Efficiency Op>ons -‐ The purpose of this sec>on is to provide flexibility for compliance. –  C406.1 Requirements. Buildings shall comply with at least one of the following: •  1. More efficient HVAC equipment performance in accordance with Sec>on C406.2.

•  2. Reduced efficient ligh>ng power density system in accordance with Sec>on C406.3.

•  3. Enhanced ligh>ng controls in accordance with Sec>on C406.4 •  4. On-‐site supply of renewable energy in accordance with Sec>on C406.5. •  5. Provision of a dedicated outdoor air system for certain HVAC equipment in accordance with Sec>on C406.6.

•  6. High efficiency service water hea>ng in accordance with Sec>on C406.8.

–  C406.2. More efficient HVAC equipment performance.


•  Water Systems –  C404.8, Service water hea>ng systems commissioning and comple>on

requirements •  This change expands the scope of mechanical commissioning to include service hot water systems.

–  C403.2.5, Hot water boiler outdoor temperature setback control -‐ Hot water boilers that supply heat to the building through one-‐ or two-‐pipe hea>ng systems shall have an outdoor setback control that lowers the boiler water temperature based on the outdoor temperature. •  This change is one of the single most energy efficient controls for a hot water boiler.

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•  Ligh>ng Systems –  C402.4.8 -‐ Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage.

–  C405.2.2.1, Automa>c >me switch controls – This change provides addi>onal details to clarify that a 7-‐day clock and holiday override features are required.

–  C405.2.2.3, Daylight responsive controls -‐ Daylight responsive controls shall be provided to control the electric lights within daylight zones in required spaces.

–  C405.2.4 Exterior ligh>ng controls -‐ Ligh>ng for exterior applica>ons other than emergency ligh>ng.


•  Conclusions •  These code changes that s>pulate minimum energy efficient standards will not necessarily meet today’s high performance building goals en>rely.

•  However, these changes will take designers & builders in the right direc>on for eventually aYaining those goals.

•  Provides criteria that will allow more new materials, new equipment & new building designs in the future.

•  Part of the evolving process for truly high performance buildings and other structures.

how changes to the ibc affect high-performance design ... · 5/29/15 1 presented&by&...

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