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If I use one bat thickness of R12 insulation in the ceiling, what R value will two R12 bats thick be?

It's for an unheated gargae - I used bags of R12 insulation, each contains 18 bats, and I put two bats thick in the walls and ceiling.One bat just seemed too littleTwo bats was slightly bursting out of the studs like a pillow, then my 6 ml poly, then drywall.

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