insulation and infiltration

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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 Presentation

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  • Insulation and Infiltration

  • Building ShellAir Barrier

  • *Air Sealing

    All homes must pass a blower door test with a result between 0.50 ACHn and 0.25 ACHn

  • *

    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 EnvelopeCorrect

  • Attic Kneewalls

  • *Air Sealing

    Bottom plate must be sealed to poured wall, slab, or subfloor.CorrectIncorrect

  • *Air Sealing

    Soffits must be sealed at cantilevered floors.

  • *Air Sealing

    Exhaust fan penetrations must be sealed at the band joist.Correct

  • *Air Sealing

    Joist cavities under attic kneewalls must be blocked.Correct

  • *Air SealingPenetrations through insulated floors must be sealed.Correct

  • *Air Sealing

    HVAC boots in insulated floors must be sealed to the subfloor.Correct

  • *Air Sealing

    Top and bottom plate penetrations must be sealed.CorrectCorrect

  • *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

  • *Air Sealing

    Gaps between pieces of exterior sheathing must be sealed.CorrectIncorrect

  • *Air Sealing

    Penetrations in exterior wall sheathing must be sealed.CorrectCorrect

  • *Air Sealing

    Exterior walls of fireplace chase must be sealed (including combustion air inlet).Incorrect

  • *Air Sealing

    Shower and tub drains must be sealed (rock wool/fiberglass not acceptable).CorrectIncorrect

  • *Air Sealing

    Solid sheet must be installed behind tubs and showers on insulated walls.Correct

  • *Air Sealing

    Window and door rough openings must be sealed (not chinked with insulation).Correct

  • *Air Sealing

    Stud cavities at changes in ceiling height must be blocked.Correct

  • *Air Sealing

    Attic kneewall doors must seal tight- this requires weatherstripping and a latch.Correct

  • *Air Sealing

    Stud cavities blocked from attic including attic kneewallsCorrect

  • *Air Sealing

    Attic kneewalls must be sheathed (and R-19 minimum insulation value).Correct

  • *Air Sealing

    Chase caps and penetrations through chase caps must be sealedCorrect

  • *Air Sealing

    Chases must be capped.

    CorrectIncorrect

  • *Air Sealing

    Recessed can lights in insulated ceilings must be air tight.Correct

  • *Air Sealing

    Ceiling mounted electrical fixtures, including lights, ceiling fans, and speakers in insulated ceilings must be sealed to drywall.Incorrect

  • *Air Sealing

    HVAC boots in insulated ceilings must be sealed to drywall.Correct

  • *Air Sealing

    Attic scuttle holes must seal tight- this requires weatherstripping

    Incorrect

  • *Air Sealing

    Attic pulldown stairs located in conditioned space must seal tight.

    CorrectCorrect

  • *Insulation

    Basement foundation walls must be insulated to a minimum of R-5 if they are part of the building envelope.

  • *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.

  • *Insulation

    Insulation must be installed against a solid air barrier (OSB, drywall, concrete, or solid sheet good).Incorrect

  • *Insulation

    Wall insulation must fill cavities completely.Correct

  • *Insulation

    Attic kneewalls must be a minimum R-19 insulation valueCorrect

  • *Insulation

    All areas of the attic must have vent openings. Bonus rooms over the garage must be vented, in addition to the attic.Correct

  • *Insulation

    Blown attic insulation may not block soffit vents - baffles must be usedCorrectIncorrect

  • *Insulation

    Blown attic insulation must have rulers and an attic card in each accessible attic spaceCorrect

  • *Moisture and Indoor Air Quality

    No polyethylene is allowed in above or below grade wall assemblies (except behind tubs and showers in bathrooms)

  • *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

  • *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 ShellAir 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.

    *********To be considered a basement wall, the average gross wall area (including openings) must be at least 50% below grade.Each wall must be considered separately.********

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