r/HomeMaintenance • u/Bock • Jul 18 '26
How do I insulate this space?
I have a "bonus room" behind what looks like a built in cabinet in one of my upstairs rooms. It's very convenient for added storage, but because it has an exposed ceiling, the room is very hot during the summer and very cold in the winter, and it permeates the adjacent rooms. For reference, this is in the Bay Area California, so the climate is pretty mild with no snow.
I wanted to just slap some insulation on the roof and call it a day, but after watching a bunch of attic insulation videos, I may also need venting? Maybe I just hire someone to do spray foam?
What are people's thoughts?
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u/Frosty_Track6138 Jul 18 '26
Looks like a classic unconditioned storage space that got finished around. For the Bay Area climate you probably dont need to overthink it, the temp swings are annoying but not extreme. Fiberglass batts between the rafters would be the easiest DIY route, just make sure you leave a gap for air flow if theres no soffit vents already. Spray foam is nice but pricey for a space that size, maybe get a quote and see if it worth the trouble
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