sb-10: the envelope ultimatum

SB-10 – THE ENVELOPE ULTIMATUM

Green Building Festival

12 October 2012

SB-10 – THE ENVELOPE ULTIMATUM | 12 OCT 2012

Energy Efficient

Enclosures & SB-10


Why does it matter?

• Codes demand it

• Substantial portion of construction budget – 20% range

• Integration with HVAC requires that the building envelope

perform

• Sustainable buildings often incorporate innovative assemblies

and materials

• Envelope failure can require costly repairs to re-establish the

design intent

• Envelopes are complex systems with shared responsibilities

and are not typically commissioned


0

2

4

6

8

10

12

1 2

Mechanical

Envelope

Why does it matter?

Extract from NCBC 2010 Seminar “Successful

Exterior Enclosure Commissioning”

Performance

Gap


Why does it matter?

$-

$10,000.00

$20,000.00

$30,000.00

$40,000.00

$50,000.00

$60,000.00

$70,000.00

$80,000.00

$90,000.00

1 2 3 4 5 6 7 8 9 10

Code Building

25% Better

based on 3%

annual inflation

over 10 years


Enclosure Failure Energy & Durability


Enclosure Failure Indoor Environmental Quality


Energy Code Trends


Achieving SB-10


OBC and SB-10

• Meet ASHRAE 90.1-2010 + SB-10 Envelope

Values (i.e. ASHRAE 189)

• Exceed ASHRAE 90.1-2010 by minimum 5%

• Exceed MNECB (1997) by minimum 25%

• 40% maximum fenestration-to-wall ratio

LEED NC 2009 prerequisite equivalent

Prescriptive

Modeled

Modeled

Design Considerations


SB-10 Envelope Values Zone Comparison

Zone

5 6 7

Assembly

Max U-value (w/m

2 K)

Min. R-Value Max U-value (w/m

2 K)

Min. R-Value Max U-value (w/m

2 K)

Min. R-Value

Roof 0.22 R-25 ci 0.18 R-30 ci 0.16 R-35 ci

Mass Walls 0.45 R-13.3 ci 0.40 R-15.2 ci 0.34 R-20 ci

Metal Building 0.30 R-13 + R-13 ci 0.30 R-13 + R-13 ci 0.30 R-13 + R-13 ci

Steel Framed 0.31 R-13 + R-10 ci 0.31 R-13 + R-13 ci 0.31 R-13 + R-10 ci

Metal framed fenestration (max 40%)

1.99 0.35 SHGC 1.99 0.40 SHGC 1.70 0.45 SHGC


Achieving SB-10 Solid Opaque Walls


Achieving SB-10 Fenestration


OBC and SB-10

• Meet ASHRAE 90.1-2010 + SB-10 Envelope

Values (i.e. ASHRAE 189)

• Exceed ASHRAE 90.1-2010 by minimum 5%

• Exceed MNECB (1997) by minimum 25%

• 40% maximum fenestration-to-wall ratio

LEED NC 2009 prerequisite equivalent

Prescriptive

Modeled

Modeled

Design Considerations


Accurate Performance

Prediction

(Energy Modeling that Works)


Energy Modeling That Works


High Performance

Enclosures


High-Performance Enclosures Building-Integrated PV


High-Performance Enclosures External Shading


High-Performance Enclosures Vegetated Green Walls

http://www.greenscreen.com/Projects/Wall_Hung/index.html

http://www.greenscreen.com/Projects/Parking_Structures/index.html


Delivering Quality Enclosure Commissioning


Verifying Performance Enclosure Commissioning


Scott R Armstrong Dipl. Arch. Tech., A.Sc.T., LEED AP BD+C

Manager, Building Science & Sustainability

Associate

MMM Group Limited

100 Commerce Valley Drive West

Thornhill ON L3T 0A1

[email protected] | m: 647.923.9053 | t: 905.882.4211 xt. 6864 | www.mmm.ca


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