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I have a room built under the roof on top of the garage, so eaves are directly behind the side walls. I removed the skirting boards to install the a new flooring and realized that there is a sizeable gap (up to 4 cm / 1.5") between some of the wall plasterboards and subfloor.

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I'd love to put some insulation in there as these gaps would definitely allow the transit of cold air from eaves into the room. I would prefer the insulation to be removable if needed, so expanding foam is probably out of the question. What else could I use?

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  • I would spray foam at the crack as it will seal the airspace.
    – Ed Beal
    Commented Jul 13, 2018 at 23:05

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Hard density foam board is probably your best option. You can get 1.5" panels and cut them to size and get an R-7.5. enter image description here

You could take batt insulation and compress it but batt insulation works best when not compressed and compressing it down to 1.5" would yield a lower R value than the rigid foam:

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