Reducing Air Leakage Through Envelope Retrofits: Does Your … · 2018-04-04 · Reducing Air...
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Reducing Air Leakage Through Envelope Retrofits: Does Your Building Suck?
NOTICE: All statements, information and data given herein are believed to be accurate and reliable, but are presented without guarantee, warranty or responsibility of any kind, express or implied. Statements or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement, and are not recommendations to infringe any patent. The user should not assume that all safety measures are indicated herein, or that other measures may not be required. The values presented herein are typical values and are not to be interpreted as product specifications. User assumes all liability for use of the information and results obtained.
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage paths
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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Air Barrier Continuity
– Continuity is the most important characteristic of the air barrier system
– Allows the proper control of air movement into and out of building enclosures
– All six sides of a building enclosure must be continuous within themselves and in conjunction with each other
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage paths
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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Failure of air barrier systems
• Failure of air barrier systems and their continuity will make buildings:
• Less healthy• Unsafe• Less durable• Uncomfortable• Energy inefficient
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• Leads to:• Uncontrolled and
uncontrollable air leakage• Caused by:
• Stack effect• Wind effect• Mechanical effect
Failure of air barrier systems
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Stack Effect
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Wind Effect
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Mechanical Effect
• Flue and Ventilation Effects
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Moisture Transport over 1 Heating Season
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Failure of Air Barrier Systems
• Effects of uncontrolled air leakage on energy consumption:• High-rise multi-family – 40%• High-rise commercial – 22-46%• School building – 29%• Supermarkets – 2 to 4 times more leaky than high-rise and school
buildings• Low-rise residential – 40%
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• Effects of uncontrolled air leakage on energy consumption:• National Institute of Standards and Technology • 2004 NIST Study:
“Investigation on the Impact of Commercial Building Envelope Airtightness on HVAC Energy Use”
Conclusion:• Continuous Air Barrier Systems can:
– Reduce air infiltration by more than 60%– Reduce energy consumption by up to 40%
Failure of Air Barrier Systems
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage paths
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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Diagnosing the problems
• Building envelope assessment
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• Building envelope assessment• Depressurization testing
Diagnosing the problems
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• Building envelope assessment• Depressurization testing• Locating air leakage paths
Diagnosing the problems
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• Building envelope assessment• Depressurization testing• Locating air leakage• Infrared thermography
Diagnosing the problems
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• Building envelope assessment• Depressurization testing• Locating air leakage• Infrared thermography• Energy saving analysis
– EC 128
Diagnosing the problems
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Air leakage paths
5. Fixing and preventing air leakage
6. Materials used
7. Success stories
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Air Leakage Paths
Seal the air leakage pathways in this order:
Seal top
Seal bottom
Seal vertical shafts
Seal outside walls
Compartmentalize
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• Seal top of building
• Attics• Roof/wall intersections and plenum spaces• Mechanical penthouse doors and walls• HVAC equipment• Other roof penetrations
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• The plenum– Air can be extracted
through many different assemblies if air barrier systems are not in place
cavity insulation
Air Leakage Paths
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• The plenum– Air can be extracted
through many different assemblies if air barrier systems are not in place
exterior sheathing
Air Leakage Paths
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• The plenum– Air can be extracted
through many different assemblies if air barrier systems are not in place
roof assembly
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• Seal top of building
Air Leakage Paths
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• Seal the air leakage pathways in this order:
Seal top
Seal bottom
Air Leakage Paths
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Seal bottom of building• Defined as: “the ground floor and anything below grade”
• Typically a unique area of the building
• Soffits and ground floor access doors
• Underground parking access doors
• Exhaust and air intake vents
• Pipe, duct, cable and other service penetrations into core of bldg
• Sprinkler hangar penetrations, inspection hatches & other holes
• Seal core wall to floor slab
• Residential crawl spaces
Air Leakage Paths
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• Seal bottom of building
Air Leakage Paths
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• Seal bottom of building
Air Leakage Paths
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• Seal bottom of building
Air Leakage Paths
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• Seal bottom of building
Air Leakage Paths
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• Seal bottom of building
Air Leakage Paths
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• Seal the air leakage pathways in this order:
Seal top
Seal bottom
Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
• Stairwell fire doors
• Fire hose cabinets
• Plumbing, electrical, cable and other penetrations within service rooms
• Elevator rooms- cable holes, door controller cable holes, bus bar openings
Air Leakage Paths
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• Seal vertical shafts
• Garbage chute perimeter and access hatches
• Hallway pressurization grille perimeters
• Smoke shaft access doors
• Elevator shaft smoke control grilles
• Service shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal vertical shafts
Air Leakage Paths
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• Seal the air leakage pathways in this order:
Seal top
Seal bottom
Seal vertical shafts
Seal outside walls
Air Leakage Paths
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• Weather-strip windows, doors, including balcony/patio doors and seal window trim
• Exhaust fans and ducting
• All service penetrations
• Baseboard heaters
• Electrical receptacles
• Baseboards
Air Leakage Paths
• Seal outside walls
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Air Leakage Paths
• Seal outside walls
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• Seal outside walls
Air Leakage Paths
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Air Leakage Paths
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• Seal outside walls
Air Leakage Paths
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Air Leakage Paths
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Air Leakage Paths
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• Seal the air leakage pathways in this order:
Seal top
Seal bottom
Seal vertical shafts
Seal outside walls
Compartmentalize
Air Leakage Paths
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Air Leakage Paths
• Compartmentalize• Garages• Vented mechanical rooms• Garbage compactor room• Emergency generator room• High voltage rooms• Shipping docks• Elevator rooms• Workshops
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Air Leakage Paths
• Compartmentalize
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Air Leakage Paths
• Compartmentalize
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Air Barrier Continuity
RECAP: Seal the air leakage pathways in this order:
TOP
BOTTOM
VERTICAL SHAFTS
OUTSIDE WALLS
COMPARTMENTALIZE
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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Fixing & Preventing Air Leakage Paths
– Conduct building assessment
– Determine location and severity of air leakage pathways
– Identify internal pathways
– Develop scope of work to create air barrier continuity
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage paths
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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• 1-component polyurethane foam sealant
• 2-component polyurethane foam insulating air seal kits
Materials Used
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• Door and window weatherstripping and seals
Materials Used
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1. Introduction to air barrier continuity
2. Failure of air barrier systems
3. Diagnosing the problems
4. Common locations of air leakage paths
5. Fixing and preventing air leakage paths
6. Materials used
7. Success stories
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Success Stories
• 3 Schools– Built in 1970’s– Roof/Wall joints
– Brimwood SPS – 9.4% electricity cost savings
– Chester Blvd. PS – 17% electricity cost savings
– Brookmill Blvd. PS – 36.5 electricity cost savings
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• Donald St. Ottawa– Peak demand before air sealing – 772 kW– Peak demand after air sealing – 687 kW– Consumption reduction after air sealing –12%
Success Stories
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• Bridletown, Toronto– Peak demand before air sealing – 496 kW– Peak demand after air sealing – 454 kW– Consumption reduction after air sealing – 6.5%
Success Stories
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How each air sealing measure contributed to combined demand reduction:
• Weatherstripping windows – 42%
• Weatherstripping exterior doors - 28%
• Sealing shafts – 14%
• Miscellaneous – 14%
Success Stories
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• St. Hilda’s, Toronto– Provincial Government Energy Program
• Weatherstripping windows and doors
• Sealing behind baseboards
• Sealing mechanical penthouse
• Sealing elevator shafts
Success Stories
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• Baycrest Geriatric Centre, Toronto– Provincial Government Energy Program
• Weatherstripping windows and doors• Sealing behind baseboards• Sealing mechanical penthouse• Sealing elevator shafts• Reduced energy costs
Success Stories
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Success Stories
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• Forest Laneway Apartments– Control smoke, odor & improve thermal comfort
• Compartmentalize– Seal mechanical rooms– Fire stop service penetrations
• Decouple floors– Seal fire cabinets, garbage chutes, air supply grilles– Weatherstrip fire, parking garage doors
Success Stories
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• Cadillac Fairview Office Tower– Eliminate thermal discomfort complaints
• Air leakage at mullions in curtain wall• Drill and plug mullions from interior• Used 2-component insulating air seal kits
Success Stories
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• Trinity College, Toronto– Energy performance contract– Weatherstripping windows
Success Stories
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• Muskoka School Board, Ontario– ESCO performance contract
• Sealing roof/wall joints and roof level change• Weatherstripping doors and windows• Seal all exhaust penetrations• Seal soffits over entry exit doors• Compartmentalize mechanical room
Success Stories
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• Gravenhurst High School, Ontario– ESCO performance contract
• Cost of building envelope retrofit -- $6,740• Energy savings in first two winter months -- $4,893
Success Stories
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Air Barrier Continuity
• Acknowledgements:– Canam Building Envelope Specialists Inc.– NRC– Building Science Corp.
NOTICE: All statements, information and data given herein are believed to be accurate and reliable, but are presented without guarantee, warranty or responsibility of any kind, express or implied. Statements or suggestions concerning possible use of our products are made without representation or warranty that any such use is free of patent infringement, and are not recommendations to infringe any patent. The user should not assume that all safety measures are indicated herein, or that other measures may not be required. The values presented herein are typical values and are not to be interpreted as product specifications. User assumes all liability for use of the information and results obtained.