How To Insulate/rat Proof Under House? - Insulation - DIY Chatroom Home Improvement Forum

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Old 11-19-2011, 05:39 PM   #1
Join Date: Nov 2011
Location: Seattle, WA
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how to insulate/rat proof under house?

Hi, I need help figuring out what I need to do to insulate and critter proof (from rats!) under my house which overhangs a cliff in Seattle. I don't have a standard crawl space under most of the house since my floor is well above the ground (>6') and is completely open to outdoors.

Here's what I'm thinking and my questions (disclaimer: I'm a total newby!):
I thought I'd string R-30 insulation between the beams, then put up plywood underneath to keep out the critters. Some questions:

Does it matter if the insulation is faced or unfaced?

Do I need any vapor barrier, and if so, is faced insulation good enough?

My beams are 7" deep, but insulation seems to come in 6 1/4 and 9" thickness. Is it worse to compress it by 2" or have a 3/4" gap?

Is plywood enough to keep out the rats?

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