BASC Search | Building America Solution Center

Right – Metal or fiberboard duct is mastic sealed at junction with duct register box

Right – Metal or fiberboard duct is mastic sealed at junction with duct register box

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Plumbing penetrations through the below slab insulation are sealed with tape and spray foam.

Plumbing penetrations through the below slab insulation are sealed with tape and spray foam.

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Wrong - Plumbing penetrations are not sealed in sub-floor and it is not recommended to run plumbing in a cantilevered floor.

Wrong - Plumbing penetrations are not sealed in sub-floor and it is not recommended to run plumbing in a cantilevered floor.

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Right – All seams in the sub-slab vapor retarder were sealed with tape.

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Right - Seam-sealing flashing tape is installed with roller to fully adhere to the OSB.

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This IR camera image shows a recessed can light that is well sealed and insulated.

This IR camera image shows a recessed can light that is well sealed and insulated.

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Air Barriers - Airtight Drywall Approach, Info-401

Reference

Brochure about creating an air barrier by sealing drywall assemblies.

Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

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Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

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Use caulk, foam or equivalent material to seal gap between partition wall

Use caulk, foam or equivalent material to seal gap between partition wall

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

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

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Right – Top plate to drywall connection sealed from attic with caulk

Right – Top plate to drywall connection sealed from attic with caulk

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Right – Neatly cut holes have been properly sealed with foam.

Right – Neatly cut holes have been properly sealed with foam.

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Right – Penetrations have been neatly cut and properly sealed with foam

Right – Penetrations have been neatly cut and properly sealed with foam

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Right – This neatly cut hole has been properly sealed with foam.

Right – This neatly cut hole has been properly sealed with foam.

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Right – This hole has been neatly cut and properly sealed with foam.

Right – This hole has been neatly cut and properly sealed with foam.

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Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser

Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser

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Right: A well-constructed air handler closet

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Roof/Attic to Exterior Wall Air Control Upgrade

Guide

Guide describing how to retrofit an exterior wall and/or attic to provide continuous air sealing.

Air Distribution Retrofit Strategies for Affordable Housing

Reference

Report describing two retrofit duct sealing techniques - manually-applied sealants and injecting a spray sealant, that were implemented in several low-rise multi-unit buildings in North Carolina.

Where the interior wall intersects the corridor wall in this multifamily building, the first intersecting wall stud is sealed to the corridor wall along both sides; other seams and penetrations in the exterior wall are also sealed

Where the interior wall intersects the corridor wall in this multifamily building, the first intersecting wall stud is sealed to the corridor wall along both sides; other seams and penetrations in the exterior wall are also sealed

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BSC Information - Critical Seal (Spray Foam at Rim Joist) for All Climates, Sheet 408

Reference

Fact sheet describing air-sealing at rim joists.

Wrong - Foil air barrier was ripped to install wiring; foil should be replaced with a solid air barrier and wiring hole should be caulked.

Wrong - Foil air barrier was ripped to install wiring; foil should be replaced with a solid air barrier and wiring hole should be caulked.

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Gypsum board is installed behind the bathtub before the tub is installed and all seams are sealed

Gypsum board is installed behind the bathtub before the tub is installed and all seams are sealed

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A technician assembles the spray sealant injection system to seal HVAC ducts from the inside

A technician assembles the spray sealant injection system to seal HVAC ducts from the inside

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The duct sealing spray injection system application tunnel inflates as the injection system operates

The duct sealing spray injection system application tunnel inflates as the injection system operates

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Sprayer-applied sealant seals every seam in the sheathing and framing of this double-walled home.

Sprayer-applied sealant seals every seam in the sheathing and framing of this double-walled home.

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Right – Spray foam is used to carefully seal behind plumbing that was installed in an exterior wall.

Right – Spray foam is used to carefully seal behind plumbing that was installed in an exterior wall.

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Right - Wood board sheathing seams are being sealed with low-expanding spray foam.

Right - Wood board sheathing seams are being sealed with low-expanding spray foam.

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Right – This register is sealed for a final test and the duct test pressure is being monitored at the register

Right – This register is sealed for a final test and the duct test pressure is being monitored at the register

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