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New Code Requirements for Fenestration Energy PerformanceFENBC WEBINARFEBRUARY 12, 2015PRESENTED BY AL JAUGELIS
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
1. New code requirements for energy performance of fenestration
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)
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)
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 90.1-2010or
2012 National Energy Code for Buildings
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
Energy related code changes—VBBL
Part 9 changes
Part 3 changes
Before Jan. 1 2015 After Jan. 1, 2015
No fenestration energyrequirements
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 90.1-2010or
2011 National Energy Code for Buildings
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 9.36All Part 9 buildings
Part 9 buildings VBBL New Subsection 10.2.2One/Two Family Dwellings ONLY
Part 3 buildings BCBC and VBBL ASHRAE 90.1-2010 or2011 NECB
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 9.36All Part 9 buildings
Part 9 buildings VBBL New Subsection 10.2.2One/Two Family Dwellings ONLY
Part 3 buildings BCBC and VBBL ASHRAE 90.1-2010 or2011 NECB
2. Climate Zones
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
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)
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
3. Fenestration energy performance for Part 3 buildings
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?
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
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
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
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
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"
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
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
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
4. Fenestration energy performance for Part 9 buildings
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
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.
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)
VBBL Div. B, Appendix A, A-10.2.2.2
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
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 wasnot available on date this was first presented.
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 )
Site-built windows and glazed portion of doors
9.36 prescriptive requirements – site-built products
Site-built windows and glazed portion of doors
9.36 prescriptive requirements – site-built products
Site-built windows and glazed portion of doors
9.36 prescriptive requirements – site-built products
Site-built windows and glazed portion of doors
9.36 prescriptive requirements – site-built products
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
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
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
5. Fenestration U-values summary: 2015 – 2020
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
Zones7B-8
ZoneC
Zone2
VBBLHomes
Zones7B-8
ZoneC
Zone2
VBBLHomes
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Discussion + Questions
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