wrote:
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.

Do fire codes actually allow installing foam without covering it with
something highly fire resistant? Should they allow it?