On Apr 16, 10:13*pm, 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.

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

thanks
richard

Foam board is easier to work with , not affected by moisture, no itch.
Fiberglass looses R value as it gets colder near zero, filber glass
irritates but there are types they say dont but they cost more. Foam
should be easier to get an airtight seal between sheets. With gas
prices going up I think foam will be alot more.