Our Heating Bill Doubled and Every Window Tested Fine

Sealing the Attic Hatch

The attic hatch itself wasn’t insulated. At all.

We pulled it down and found bare plywood, maybe half an inch thick, separating our heated hallway from a 20-degree attic. No weather stripping around the edges, no foam, nothing to stop air from pouring through the quarter-inch gaps on all four sides.

The fix took one trip to Home Depot and about forty minutes.

We picked up a sheet of foil-faced foam board ($18 for a 4×8 sheet), enough adhesive weather stripping for the perimeter ($8), and a roll of foil tape ($6). Total cost: $32.

I cut the foam to fit the back of the hatch, stuck it on with construction adhesive, then ran weather stripping around the frame where the door meets the ceiling. The foam tape compresses when you close it, sealing the gap.

The next heating bill dropped by nearly half—and yes, February ran a bit milder than January, but even accounting for degree days we were pulling way less energy than December at the same outdoor temps.

One warning: if your attic hatch is part of a fire-rated assembly or sits above a furnace room, call a contractor. Some locations require specific materials for code. Otherwise, this is a straightforward DIY.