Seal Attic Hatch

How to insulate and air seal an attic access hatch. Once you have the materials you can begin to seal and insulate the knee wall access door through these steps. Sealing the attic hatch or door finish up by sealing the access hatch with self sticking weather stripping.

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The insulation will both slow heat loss and add ballast to the hatch to improve the seal at the weatherstripping.

Seal attic hatch.

Remove your existing attic hatch and measure its size. Cut four pieces of polystyrene rigid insulation about 1 2 inch smaller than the dimensions of the hatch. 2 thick foam board 4 8 sheet with an r value of 10 or greater 15 foam weather stripping the wider the better 1 can great stuff foam or similar 1 tube liquid nail or other construction adhesive 8 16 penny nails misc. If your hatch rests directly on the moldings add 2 1 2 inch wide stops around the opening.

The stops provide a wider surface for attaching the weatherstrip and a space to mount hook and eye fasteners. From inside the attic check for any openings holes or fenestrations into the knee wall surrounding area. Air seal the trim the first step is air sealing the finish trim and enclosure around the attic hatch. Diy sealing the attic hatch seal trim to ceiling create air tight seal between hatch and trim.

Apply weather stripping to the door to create a seal. Hardware 2 small bungee cords to seal it tight. Carefully pull down the finish trim. Pray that the installer used finish nails and not say ring shank nails.

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