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September/October 2007 Issue
Sealing Attic Hatches 
by Ian Shapiro and Timothy Lambert
Attic hatches are a common source of air leaks in homes. But how bad is it?
Attic hatches are a common source of air leakage from homes. This leakage contributes to energy losses, and to the formation of ice on roofs in northern climates, as the warm attic melts snow on the roof above.
The International Energy Conservation Code (IECC) requires that all sources of air leakage through a building’s thermal envelope in new construction be air sealed. This includes attic hatches. But unfortunately, most attic hatches in existing buildings do not have gasketed doors or caulked frames.
Attic hatches are commonly constructed simply by laying a piece of plywood on a frame formed by wood molding...
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