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

rdhbe.com

Discussion + Questions

FOR FURTHER INFORMATION PLEASE VISIT