Living Green in Colorado: Air Sealing Materials

if you’re considering some do-it-yourself weatherization projects, make sure you’re using the right air-sealing materials for the job:
Caulk — Seals gaps of less than ½ inch. Select grade (interior, exterior, high temperature) based on application
Spray foam,— Fills large cracks and small holes. It can be messy (use light weigh disposable latex gloves. If you do get some on your hands you can use kerosene or rubbing alcohol to remove the foam from your hands) consider new latex-based foams. Do not us near flammable, applications (e.g., flue vents). ho not use expanding types on windows and doors
Backer rod — Closed-cell foam or rope caulk. Press into crack or gap with screwdriver or -putty knife. Often used with caulk around window and door rough openings
Housewrap — Installed over exterior sheathing. Must be sealed with housewrap tape or caulk to form an airtight seal. Resists water but is not a vapor barrier. (Mainly used in unfinished crawl spaces)
Polyethylene plastic — This inexpensive material for air sealing also stops vapor diffusion. All edges and penetrations must be completely sealed for an effective air barrier. Poly is fragile, and proper placement is climate specific.
Weatherstripping — Used to seal moveable components, such as doors, windows, and attic accesses.
Mastic — Seals air handlers and all duct connections and joints.
UL18I or foil-faced tape — Temporarily seals the air handler.

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