insulation and infiltration
DESCRIPTION
Insulation and Infiltration. Building Shell. Air Barrier. Air Sealing. All homes must pass a blower door test with a result between 0.50 ACHn and 0.25 ACHn. 3. Good Building Envelope. Create an airtight shell using wall sheathing and ceiling drywall. - PowerPoint PPT PresentationTRANSCRIPT
Insulation and Infiltration
Building Shell
Air Barrier
3
Air Sealing
All homes must pass a blower door test with a result between 0.50 ACHn and 0.25 ACHn
4
• Create an airtight shell using wall sheathing and ceiling drywall.
• Fill cavities completely with insulation.
• Encapsulate insulation on all sides.
• Use required Energy Code R-values.
Good Building Envelope
Correct
Attic Kneewalls
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Air Sealing
Bottom plate must be sealed to poured wall, slab, or subfloor.
Correct
Incorrect
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Air Sealing
Soffits must be sealed at cantilevered floors.
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Air Sealing
Exhaust fan penetrations must be sealed at the band joist.
Correct
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Air Sealing
Joist cavities under attic kneewalls must be blocked.
Correct
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Air Sealing
Penetrations through insulated floors must be sealed.
Correct
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Air Sealing
HVAC boots in insulated floors must be sealed to the subfloor.
Correct
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Air Sealing
Top and bottom plate penetrations must be sealed.
Correct
Correct
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Air Sealing
Exterior doors must have weatherstripping, thresholds, and doorknobs prior to final inspection in order to pass (including basement doors if they penetrate the building envelope).
Correct
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Air Sealing
Gaps between pieces of exterior sheathing must be sealed.
CorrectIncorrect
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Air Sealing
Penetrations in exterior wall sheathing must be sealed.
Correct Correct
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Air Sealing
Exterior walls of fireplace chase must be sealed (including combustion air inlet).
Incorrect
20
Air Sealing
Shower and tub drains must be sealed (rock wool/fiberglass not acceptable).
CorrectIncorrect
21
Air Sealing
Solid sheet must be installed behind tubs and showers on insulated walls.
Correct
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Air Sealing
Window and door rough openings must be sealed (not chinked with insulation).
Correct
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Air Sealing
Stud cavities at changes in ceiling height must be blocked.
Correct
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Air Sealing
Attic kneewall doors must seal tight- this requires weatherstripping and a latch.
Correct
25
Air Sealing
Stud cavities blocked from attic – including attic kneewalls
Correct
26
Air Sealing
Attic kneewalls must be sheathed (and R-19 minimum insulation value).
Correct
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Air Sealing
Chase caps and penetrations through chase caps must be sealed
Correct
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Air Sealing
Chases must be capped.
CorrectIncorrect
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Air Sealing
Recessed can lights in insulated ceilings must be air tight.
Correct
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Air Sealing
Ceiling mounted electrical fixtures, including lights, ceiling fans, and speakers in insulated ceilings must be sealed to drywall.
Incorrect
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Air Sealing
HVAC boots in insulated ceilings must be sealed to drywall.
Correct
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Air Sealing
Attic scuttle holes must seal tight- this requires weatherstripping
Incorrect
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Air Sealing
Attic pulldown stairs located in conditioned space must seal tight.
Correct Correct
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Insulation
Basement foundation walls must be insulated to a minimum of R-5 if they are part of the building envelope.
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Insulation
Concrete foundation walls may not be insulated with kraft-paper faced fiberglass batts. Unfaced batts, blown in fiberglass, or perforated vinyl encapsulated batts are permitted.
Note: Floors over an unconditioned basement can be insulated instead of foundation walls. When intending for the basement to be conditioned, you must plan for this in the load calculation or the equipment will be too small.
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Insulation
Insulation must be installed against a solid air barrier (OSB, drywall, concrete, or solid sheet good).
Incorrect
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Insulation
Wall insulation must fill cavities completely.
Correct
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Insulation
Attic kneewalls must be a minimum R-19 insulation value
Correct
39
Insulation
All areas of the attic must have vent openings. Bonus rooms over the garage must be vented, in addition to the attic.
Correct
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Insulation
Blown attic insulation may not block soffit vents - baffles must be used
Correct
Incorrect
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Insulation
Blown attic insulation must have rulers and an attic card in each accessible attic space
Correct
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Moisture and Indoor Air Quality
No polyethylene is allowed in above or below grade wall assemblies (except behind tubs and showers in bathrooms)
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Moisture and Indoor Air Quality
All fireplaces and other combustion equipment must be equipped with a flue and outside combustion air supply.
No ventless fireplaces are allowed.
Correct
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Insulation
Limit the number of 4x8 sheets of subfloor installed in the attic. (If more than two sheets of subfloor is desired, it is recommended they be raised up to provide for the full attic height of insulation underneath.)
Building Shell
Air Barrier
Air That Has Been Heated, Rises.
As the air inside the envelope is heated, it begins to rise.
Air That Has Been Heated, Rises.
The Air will escape through any available hole.
Air That Has Been Heated, Rises.
COMMON HOLESBathroom Fans and Wiring/Plumbing penetrations
Air That Has Been Heated, Rises.
As air leaves the envelope, it creates aNegative (pulling) pressure.
Air That Has Been Heated, Rises.
Outside air is drawn into the home to replace the escaping warm air.
Air That Has Been Heated, Rises.
The cold outside air is then heated. As the air is heated it rises.
Air That Has Been Heated, Rises.
The cycle is repeated.