wrote in message
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Hello all,

Looking for opinions on crawl space insulation. This is for an old
rent house on block and pad foundation. I am considering either R13 or
1 1/2" rigid foam (vapor barrier on one side and radiant barrier on
the other).

Fiber seems to have better cumulative R-value. However, I don't know
if bugs and crawlies nesting in it will be an issue. I can get the 1
1/2 for about 10 dollars a piece. Fiber will let me do this
incrementally as time allows.

Trying to get a feel on what is the better option.

thanks
richard

There is price and there is value. No way would I use fiber in a crawl
space. Could be good rodent nesting. Spray foam is best for that, but foam
board would be my next choice.