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dablakh0l t1_j22cw4o wrote

You can start by grabbing some expanded owens-corning pink foam boards. They come in 2" thick and are easily cut. Also get a can of the water-based spray foam, so that you can clean it up easily in the future if you need to. Cut 2 pieces from the foam board to fit the hole and so you end up with 4" of insulation. Fill any gaps around the edges with the spray foam, and enjoy the lack of cold air making it into your living space.

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Liberty-Justice-4all t1_j22oxvj wrote

This is the answer.

2 inch is overkill though, two layers of half inch or so one at the outside and one neat the inside of the opening will be THE most insulated part of your wall.

The stuff is incredibly light, incredibly easy to slice with a boxcutter, and incredibly incredibly insulative.

Cut it intentionally a bit bigger, put it in diagonally and push it towards being flat.

It will wedge and seal like the dickens as you shove the leaning sides.

Then do another one or so their is air space between them.

Measure your hole before you go and cut with 2 inches spare there.

(These things are cheap, but come in huge sheets that are a pain to transport)

Then stick the spare stuff in the back of your closet and haul it out whenever you want to be constructive over the years.

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Pulaski540 t1_j27mg51 wrote

Take measurements before you buy it, then cut it to size in the parking lot outside the store where you bought it. ... I have been known to take a T-square and a handsaw with me to Lowe's to cut timber or boards even though I own a pickup. Sometimes it is just that much easier to carrying material already cut into smaller pieces.

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snackedactor t1_j22x7sx wrote

This is the right answer.

Tip: Bring (or buy) a handsaw (doesn't need to be an expensive one) so you can rough cut the board and fit in your vehicle. Then you can cut it to fit at home.

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