BASC Search | Building America Solution Center

Right – Metal duct boot is properly sealed at seams

Right – Metal duct boot is properly sealed at seams

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Right – Flex duct is mastic sealed at junction box

Right – Flex duct is mastic sealed at junction box

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Right – Metal or fiberboard duct is mastic sealed at seams

Right – Metal or fiberboard duct is mastic sealed at seams

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Right - Rigid foam board is attached to the interior surface of the basement walls.

Right - Rigid foam board is attached to the interior surface of the basement walls.

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Right – Rigid foam is attached to the exterior of this foundation wall.

Right – Rigid foam is attached to the exterior of this foundation wall.

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Right – Spray foam is used to seal around PEX plumbing pipes.

Right – Spray foam is used to seal around PEX plumbing pipes.

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Right – The exterior wall cavities are completely filled with dense-packed cellulose.

Right – The exterior wall cavities are completely filled with dense-packed cellulose.

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Properly installed vapor barrier

Properly installed vapor barrier

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Stuff cavities under kneewalls with rolls of fiberglass batt and spray foam in place

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Assembled section of fiber board duct

Assembled section of fiber board duct

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Right – Open-cell spray foam fills the cavity in this these double-stud walls

Right – Open-cell spray foam fills the cavity in this these double-stud walls

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The seams in the ceiling drywall are sealed from the attic side with spray foam.

The seams in the ceiling drywall are sealed from the attic side with spray foam.

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Right - R-100 of blown cellulose covers the floor and rafters of this attic.

Right - R-100 of blown cellulose covers the floor and rafters of this attic.

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Right – This home’s exterior walls are double walls for increased R value.

Right – This home’s exterior walls are double walls for increased R value.

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Right – Open-cell spray foam fills the attic floor joists.

Right – Open-cell spray foam fills the attic floor joists.

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This air conditioner is located in an unconditioned attic and has a condensate line that is uninsulated.

This air conditioner is located in an unconditioned attic and has a condensate line that is uninsulated.

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Retrofit Existing Crawl Space Foundations with Cripple Walls to Increase Seismic Resistance and Thermal Performance

Guide

Guide describing different options for providing seismic and thermal resistance for homes with 'cripple' wall crawlspace foundations, which are known for their instability.

Wrong - Unfaced fiberglass batt is not properly cut to fit in all the stud bays.

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Wrong - Double top plate seam is poorly caulked.

Wrong - Double top plate seam is poorly caulked.

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Use only Underwriters Laboratory UL-181 approved tape

Use only Underwriters Laboratory UL-181 approved tape

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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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Wrong: Duct is hung between truss members by strapping and not buried

Wrong: Duct is hung between truss members by strapping and not buried

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Two-stud corner using drywall clips; detail shows nail placement for exterior trim

Two-stud corner using drywall clips; detail shows nail placement for exterior trim

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Right - Closed-cell spray foam was applied to the interior of a foundation wall.

Right - Closed-cell spray foam was applied to the interior of a foundation wall.

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Four inches of rigid foam separate the concrete slab from the ground and the foundation walls.

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A thick vapor barrier and radon vent pipe keep soil gases out of the home.

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Right – Construction adhesive is applied to the rigid foam panels that will be installed on the interior basement walls.

Right – Construction adhesive is applied to the rigid foam panels that will be installed on the interior basement walls.

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Right – Rigid foam completely covers the foundation walls of the home.

Right – Rigid foam completely covers the foundation walls of the home.

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Re-install the storm window panels, ensuring that the low-E coating is facing outwards.

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Technology Solutions Case Study: Preventing Thermal Bypass

Case Study

Case study describing techniques used to prevent thermal bypass in new homes.

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