New Code Requirements for Fenestration Energy Performance
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The document details new code requirements for fenestration energy performance under the BC Building Code (BCBC) and the Vancouver Building Bylaw (VBBL), effective from December 19, 2014, and January 1, 2015, respectively. Key topics include the distinctions between Part 3 and Part 9 buildings, climate zone regulations for energy performance, and compliance requirements for fenestration U-values. It emphasizes that architects are responsible for compliance with these standards and outlines requirements for documentation and performance testing for fenestration products.
New Code Requirements for Fenestration Energy Performance
- 1. New Code Requirements for Fenestration Energy Performance FENBC WEBINAR FEBRUARY 12, 2015 PRESENTED BY AL JAUGELIS
- 2. Topics covered 1. Summary of new code requirements 2. Climate Zones 3. Part 3 Buildings 4. Part 9 buildings 5. Fenestration U-values: 2015 – 2020
- 3. 1. New code requirements for energy performance of fenestration
- 4. Energy related code changes—BCBC 2012 BCBC code changes related to energy efficiency: Announced April 2013 Took effect Dec. 19, 2014 (building permits) Changes affect all buildings (Part 3 and Part 9)
- 5. Building Code—Part 9 vs. Part 3 Part 9 of Code applies to: Buildings up to 3 storeys tall, with building area not exceeding 600 m2 and used for these major occupancies: Residential occupancies Business and personal services occupancies Mercantile occupancies Medium- and low-hazard industrial occupancies “If it’s new, and it’s on the ground, and it ain’t Part 9, it’s Part 3” (oversimplification)
- 6. Energy related code changes—BCBC Part 9 changes Part 3 changes Before Dec. 19, 2014 After Dec. 19, 2014 No energy requirements for fenestration New Section 9.36: comprehensive energy requirements include fenestration Before Dec. 19, 2014 After Dec. 19, 2014 ASHRAE 90.1-2007 ASHRAE 90.1-2010 or 2012 National Energy Code for Buildings
- 7. Energy related code changes—VBBL 2014 VBBL code changes related to energy efficiency: Part 9 announced April 2014, took effect Jan. 1, 2015 Part 3 changes took effect Nov. 2013
- 8. Energy related code changes—VBBL Part 9 changes Part 3 changes Before Jan. 1 2015 After Jan. 1, 2015 No fenestration energy requirements One and two family dwellings, laneway houses: Subsection 10.2.2 Other Part 9 buildings: No code requirement, BCEEA applies Before Jan. 21, 2014 After Jan. 21, 2014 ASHRAE 90.1-2007 ASHRAE 90.1-2010 or 2011 National Energy Code for Buildings
- 9. City of Vancouver Part 3 requirements differ from BCBC BCEEA only applies where there is no code provision BCEEA needs to be updated Update expected in 2015 Summary of fenestration energy requirements 2015 Part 9 buildings BCBC New Section 9.36 All Part 9 buildings Part 9 buildings VBBL New Subsection 10.2.2 One/Two Family Dwellings ONLY Part 3 buildings BCBC and VBBL ASHRAE 90.1-2010 or 2011 NECB
- 10. City of Vancouver Part 3 requirements differ from BCBC BCEEA only applies where there is no code provision Needs to be updated Update expected in 2015 Summary of fenestration energy requirements 2015 Part 9 buildings BCBC New Section 9.36 All Part 9 buildings Part 9 buildings VBBL New Subsection 10.2.2 One/Two Family Dwellings ONLY Part 3 buildings BCBC and VBBL ASHRAE 90.1-2010 or 2011 NECB
- 11. 2. Climate Zones
- 12. BC climate zones Energy performance properties are regulated with respect to Climate Zones Climate Zones are based on the Heating-Degree Day (HDD) values in the Code HDD called “Degree-Days Below 18°C” in Code
- 13. BC climate zones Energy performance properties are regulated with respect to climate zones—but consult AHJ first! ASHRAE 90.1 Climate Zones (SI units) 2011 NECB and BCBC 9.36 Climate Zones (SI units)
- 14. BC climate zones Energy performance properties are regulated with respect to climate zones—but consult AHJ first! ASHRAE 90.1 Climate Zones (SI units) 2011 NECB and BCBC 9.36 Climate Zones (SI units) Vancouver is in ASHRAE 90.1 Zone 5 Vancouver is in NECB/9.36 Zone 4
- 15. 3. Fenestration energy performance for Part 3 buildings
- 16. Fenestration on Part 3 buildings ASHRAE 90.1 and NECB are whole building energy performance standards Both have prescriptive, trade-off, and performance based compliance paths Who is responsible for compliance to these standards?
- 17. Fenestration on Part 3 buildings Suppliers do not comply with ASHRAE 90.1 or NECB— architects do Design team chooses a compliance path for the building Determine type and extent of fenestration Determine performance requirements (U-value, SHGC) Specify products and performance requirements Suppliers (manufacturers/contractors) provide products with specified characteristics Suppliers must demonstrate compliance with specified U-value, SHGC, air leakage requirements
- 18. ASHRAE 90.1 compliance paths All compliance paths require U-values to be determined using NFRC 100, SHGC using NFRC 200 Prescriptive Path Building Envelope Trade-off Path Performance Path AAMA methods to determine U-value are not recognized by ASHRAE 90.1, though they may be accepted by some consultants
- 19. NECB compliance paths All NECB compliance paths require U-values, SHGC to be determined using NFRC 100/200 or CSA A440.2 Prescriptive Path Building Envelope Trade-off Path Performance Path
- 20. Supplier compliance documentation Q: How do you show compliance with ASHRAE 90.1 U-value/SHGC requirements? A: "permanent nameplate" or a "signed and dated certification" by the manufacturer, installer, or supplier based on
- 21. Supplier compliance documentation Q: How do you show compliance with ASHRAE 90.1 U-value/SHGC requirements? A: "permanent nameplate" or a "signed and dated certification" by the manufacturer, installer, or supplier based on: NFRC 100 test sizes NFRC 100 & 200 simulations NFRC 100 physical testing Ratings to be "determined by a laboratory accredited by a nationally recognized accreditation organization, such as the National Fenestration Rating Council"
- 22. Supplier compliance documentation Q: How do you show compliance with NECB U-value requirements? A: No form of documentation specified, but: Ratings to be based on NFRC 100 / CSA A440.2 test sizes and test methods
- 23. Supplier compliance documentation What about spandrels, deflection channels, “actual size configurations”? NFRC 100 and CSA A440.2 do not require actual size simulations or inclusion of deflection channels, flashings, and similar thermal bridges Some designers believe these must be included, so you may get requests for that
- 24. Supplier compliance documentation So what is the minimum compliance documentation you need to submit? Whatever is required in the specifications Whatever the architect or AHJ will accept
- 25. 4. Fenestration energy performance for Part 9 buildings
- 26. City of Vancouver—Subsection 10.2.2. Maximum fenestration U-values (one and two family dwellings, laneway homes only): Windows and glass doors (sliding, hinged, folding): 1.4 W/m²•°K ( 0.25 Btu/h•ft2•°F ) Skylights: 2.4 W/m²•°K ( 0.42 Btu/h•ft2•°F ) “Averaging” of fenestration U-values is permitted to allow for individual products that exceed maximums
- 27. Q: What about other products, such as opaque, partially glazed or wood doors? A: Not regulated at this time. Q: What about “commercial” aluminum products such as curtain wall? A: Presumably treated the same as windows. Q: Is there still a 15% fenestration to floor area limit? A: No. It has been removed. City of Vancouver—Subsection 10.2.2.
- 28. City of Vancouver—Subsection 10.2.2. Compliance requirements See VBBL Appendix Products must be labeled with certified U-values as required by BCEEA Certified Energy Advisers (CEAs) are being trained to determine compliance with energy performance requirements, including windows Allows P.Eng to average overall U-values at actual sizes similar to BCEEA “flexibility provision” (City has discussed simplified UxA averaging as well, not clear in Code)
- 30. VBBL Div. B, Appendix A, A-10.2.2.2
- 31. Performance path uses whole building energy modeling that allows departure from prescriptive requirements Rest of BC—Section 9.36 9.36 compliance path Part 9 building type 9.36.2 Prescriptive or Trade-off Paths Residential occupancy, including houses Small business, commercial, low-hazard industrial (<300 m2) Buildings containing both 9.36.5 Performance Path Houses Residential buildings with common spaces 2011 NECB Non-residential occupancies (>300m2) Medium hazard industrial
- 32. 9.36 prescriptive requirements Products covered Manufactured products Windows, doors, skylights, curtain wall, including site- glazed and site-assembled products Prescriptive U-values according to climate zone Site-built products Site-built products are those to which BCBC 9.7.5 applies: they are “products outside the scope of NAFS” * Site-built products can comply by having the prescriptive glass required by Table 9.36.2.7.C. * Based on email correspondence with Building Safety and Standards Branch. Info was not available on date this was first presented. Slide Updated on March 10, 2015 based on new information from BC Building Safety and Standards Branch
- 33. 9.36 prescriptive requirements Manufactured products: max. U-values based on climate zone Exception: 9.36.2.7.(5): One door “separating conditioned from unconditioned space” may have a U-value up to 2.6 W/m²•°K ( 0.46 Btu/h•ft2•°F )
- 34. Site-built windows and glazed portion of doors 9.36 prescriptive requirements – site-built products
- 35. Site-built windows and glazed portion of doors 9.36 prescriptive requirements – site-built products
- 36. Site-built windows and glazed portion of doors 9.36 prescriptive requirements – site-built products
- 37. Site-built windows and glazed portion of doors 9.36 prescriptive requirements – site-built products
- 38. 9.36 trade-off path Fenestration trade-off limitations Can only trade window for window, door for door Total areas of all traded windows are equal Traded windows must have the same orientation Sum of areas of all traded windows divided by their effective thermal resistance ≤ to what they would be if all windows complied with prescriptive U-values Other envelope trade-offs are permitted only when total fenestration to wall ratio is between 15% and 17% of above ground gross wall area
- 39. Performance path The performance path allows greatest design flexibility and variation from prescriptive requirements Requires energy modeling to show that proposed house is no less energy efficient than a reference house of same size built to prescriptive requirements High performance (low U-value) windows will allow larger glazed areas, free designers from prescriptive requirements
- 40. Compliance requirements No specific compliance requirements identified in code language circulated for public comment Presumably building officials or CEAs will be looking for BCEEA certified U-value labels
- 41. 5. Fenestration U-values summary: 2015 – 2020
- 42. Summary of U-values: 2015 – 2020 From Energy Star to code regulation of fenestration U-values, there is a lot to grasp Helpful to view the prescriptive requirements side by side, arranged with reference to climate zones ASHRAE 90.1 has detailed individual tables for each climate zone, and for specific building types within each zone ASHRAE 90.1 values in the following tables are for Residential buildings
- 54. rdhbe.com Discussion + Questions FOR FURTHER INFORMATION PLEASE VISIT