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Tried spray foam in my garage ceiling and now my upstairs floor is freezing
I insulated my attached garage ceiling last month with that DIY spray foam kit from the hardware store. Thought it would keep the garage warmer in winter. Instead my living room floor above it is now ice cold, my gas bill went up about 60 bucks, and the garage still sits at 4 degrees most mornings. Turns out the heat was coming up from the garage into the house before, even if it felt wasteful. Now I'm wondering if I should have just left it or if I need to add vents. Anyone else mess with garage insulation and get the opposite result?
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ross.terry14d ago
Garage ceilings are a weird one. You basically sealed off the heat that was bleeding up into your floor joists, and that air was what kept your living room warm. So now that heat has nowhere to go, and the cold outside is winning through the foam. I'd check if there's any air sealing left around the perimeter edges and electrical boxes before you add vents. Those gaps can pull cold air straight in and make it feel like the foam did nothing. Also, that foam might be trapping moisture now, which can rot things out over time. Honestly, vents might help, but only if the garage is still getting some heat from somewhere, otherwise you're just letting more cold in. Keep an eye on that gas bill for another month, sometimes it spikes while the house rebalances.
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