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Use a pry bar or dull putty knife to push backer rod into the rough opening around an existing window

Use a pry bar or dull putty knife to push backer rod into the rough opening around an existing window
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Use caulk or spray foam to air-seal all four edges of the blocking material in each joist bay.

Use caulk or spray foam to air-seal all four edges of the blocking material in each joist bay.
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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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Use caulk, foam, or equivalent material to seal gap between common wall

Use caulk, foam, or equivalent material to seal gap between common wall
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Use low-expanding canned spray foam to seal unused holes, gaps around wires, and seams in the outlet box.

Use low-expanding canned spray foam to seal unused holes, gaps around wires, and seams in the outlet box.
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Use masking tape as a removable sealer to stop air from leaking around the return grille filter.

Use masking tape as a removable sealer to stop air from leaking around the return grille filter.
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Use pry bars to remove the trim around an existing window to access the rough opening

Use pry bars to remove the trim around an existing window to access the rough opening
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Vented Attic vs Unvented Cathedral Attic Air Flow

Vented Attic vs Unvented Cathedral Attic Air Flow
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Vented roof assembly at eave retrofitted with rigid foam, spray foam, and fully adhered membrane to air seal the top of wall-to-roof transition

Vented roof assembly at eave retrofitted with rigid foam, spray foam, and fully adhered membrane to air seal the top of wall-to-roof transition
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Vented roof assembly at rake retrofitted with spray foam and additional insulation installed at the attic floor and extended to the rake edge

Vented roof assembly at rake retrofitted with spray foam and additional insulation installed at the attic floor and extended to the rake edge
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Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics

Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics
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Ventilation duct is compressed because supporting strap is too small

Ventilation duct is compressed because supporting strap is too small
Case Study:

Veridian Homes: Cold Climate Region 40+% Energy Savings

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Vertical service shafts and trash chutes are isolated from corridors in multistory buildings by locating them within the vestibules

Vertical service shafts and trash chutes are isolated from corridors in multistory buildings by locating them within the vestibules
Presentation:

Voice of the Builder: DOE Zero Energy Ready Home Builders Share their Secrets for Cost-Effective High-Performance Homes

Video:

Wall Bracing: Satisfy the code with strong, resilient, fully sheathed walls

Video:

Wallingford Passive House | Blower Door Test

Video:

Wallingford Passive House | Exterior Assembly Details

Video:

Walls Behind Showers and Tubs (2)

Video:

Water Moisture Issues: Flashing Windows, Water Leaks, and Kick-Out Flashings

Presentation:

Water Ratings - How Accurate Can They Be?

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Weatherstrip installation on a door.

Weatherstrip installation on a door.
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Weatherstripping has been installed along the edge of this attic access panel to air seal the opening.

Weatherstripping has been installed along the edge of this attic access panel to air seal the opening.
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Weatherstripping has been installed along the framing of this attic access panel to air seal the opening.

Weatherstripping has been installed along the framing of this attic access panel to air seal the opening.