BASC Search | Building America Solution Center

Right - Hole drilled to verify sealant is present - Hole will be sealed after verification

Right - Hole drilled to verify sealant is present - Hole will be sealed after verification

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Right – Top plate to drywall connection sealed from attic with foam sealant

Right – Top plate to drywall connection sealed from attic with foam sealant

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Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

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Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

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Right – These neatly cut holes have been properly sealed with caulk and foam.

Right – These neatly cut holes have been properly sealed with caulk and foam.

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Glasswood Commercial Passive House Retrofit: Air Barrier

Video

Video describing the air barrier installed in a passive house.

New Code Options for Insulating, Sealing, and Controlling Moisture in Unvented Attics in Residential Buildings

New Code Options for Insulating, Sealing, and Controlling Moisture in Unvented Attics in Residential Buildings

Presentation

Webinar explaining new code options for insulating, sealing, and controlling moisture in unvented attics in residential buildings.

Exhaust terminates to the outside away from air inlets

Exhaust terminates to the outside away from air inlets

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Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.

Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.

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A caulk gun is a simple but power tool for sealing narrow cracks between framing and around penetrations.

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Install weatherstripping in the framing of openable doors and windows; use caulk to seal seams in and around trim.

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Right – Flex duct is properly connected to metal duct with a duct tie and connection is mastic sealed

Right – Flex duct is properly connected to metal duct with a duct tie and connection is mastic sealed

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All wood-to-wood joints and wiring holes have been sealed in this exterior wall

All wood-to-wood joints and wiring holes have been sealed in this exterior wall

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The seams in the plywood are taped seams in the cathedral ceiling serve as part of the advanced home sealing strategy.

The seams in the plywood are taped seams in the cathedral ceiling serve as part of the advanced home sealing strategy.

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Right – The joint between the foundation wall and the mud sill is thoroughly sealed with a liquid-applied sealant.

Right – The joint between the foundation wall and the mud sill is thoroughly sealed with a liquid-applied sealant.

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Right – The top plate-to-dry wall seams of the interior walls are sealed from the attic.

Right – The top plate-to-dry wall seams of the interior walls are sealed from the attic.

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Non-hardening removable putty can be used to seal around wiring holes in the HVAC cabinet

Non-hardening removable putty can be used to seal around wiring holes in the HVAC cabinet

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Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.

Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.

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Conducting a Residential Duct Leakage Test and Blower Door Test: Duct blaster testing – sealing the supply registers

Video

Video describing how to conduct a residential duct air leakage test, including why and how to seal off all of the supply air registers, including kickplate registers. Video 7 of 9.

Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.

Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.

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Right – All electrical boxes are carefully sealed as are all top plate-to-drywall seams.

Right – All electrical boxes are carefully sealed as are all top plate-to-drywall seams.

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Whole house fans draw cool night-time air in through open windows and expel hot house air into the vented attic

Whole house fans draw cool night-time air in through open windows and expel hot house air into the vented attic

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The missing top plate in a kneewall was covered with lumber and rigid foam insulation and then sealed with spray foam

The missing top plate in a kneewall was covered with lumber and rigid foam insulation and then sealed with spray foam

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Vented Attic vs Unvented Cathedral Attic Air Flow

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Wrong - This IR image shows air leakage around a window.

Wrong - This IR image shows air leakage around a window.

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Right – all seams in the rigid foam were sealed with tape before installing the wire lathe for stucco.

Right – all seams in the rigid foam were sealed with tape before installing the wire lathe for stucco.

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This fan has noticeable gaps between the fan box and the drywall that will need to be sealed with spray foam or caulk

This fan has noticeable gaps between the fan box and the drywall that will need to be sealed with spray foam or caulk

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Duct boots sealed to floor, wall, or ceiling using caulk, foam, mastic tape, or mastic paste

Duct boots sealed to floor, wall, or ceiling using caulk, foam, mastic tape, or mastic paste

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The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)

The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)

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Bottom plate-subfloor joints, corners, and wiring holes are all sealed with foam to improve the airtightness of the homes.

Bottom plate-subfloor joints, corners, and wiring holes are all sealed with foam to improve the airtightness of the homes.

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