Insulating Attics

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Repairing a Rotting Roof

Reducing indoor humidity was a critical first step. More

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Air-Sealing Attics In Existing Homes

For best results, locate the heat loss with a blower door and an infrared camera. More

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Insulating Unvented Attics With Spray Foam

Closed-cell polyurethane foam provides the insulation, air barrier, and vapor... More

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Island House Makeover — Insulating the Skin

In the teeth of a record-breaking winter, Thompson Johnson Woodworking wraps the... More

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Buried and Encapsulated Ducts

Encapsulating ducts with at least 1 1/2 inches of closed-cell spray foam... More

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Thermal Imaging With a Blower Door

Though it's impossible to seal every hole in an existing building to prevent air... More

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Insulating Attics Instruction

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Creating a Palette of Foam-Free Superinsulation Details

There’s more than one way to build a highly insulated, air-tight house—or to tighten up and super-insulate an existing home. Here’s a look at an evolving array of superinsulated details that don’t use spray foam. More

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Reusing Loose-Fill Cellulose

Working around existing attic insulation to seal air leaks may be more cost-effective than removing and replacing it More

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Fire Retardant in Spray Foam

Is it a potential health hazard? More

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Attic Insulation for Hot Climates?

Q: Builders in cold climates often go beyond code-required attic insulation levels... More

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Can Fiberglass Batts Perform Well in Tightly Sealed Houses?

I understand that fiberglass batt insulation can allow air to move through it and that this air movement degrades the insulation's R-value. Two causes I've heard about are wind-washing at the eaves and convective loops that can start in a wall cavity on really cold days and wick warmth from inside to the outside wall surface. But recently I have taken pains to do a very good air-sealing job on everything I build, whether it's an addition or a new house. I'm getting blower-door readings of less than 1.5 air changes per hour at 50 pascals. I also use baffles at the eaves, and seal the sheathing to the framing before insulating. Under these conditions - with air movement cut to a minimum - will fiberglass insulation perform at its stated R-value? More

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