On Sep 29, 11:03*pm, "Steve Barker DLT"
wrote:
Yes, compression hurts the r value. *AND if it's trusses, you can't put
anything up there.

s

"jtpr" wrote in message

...



I am insulating the ceiling in my garage. *The ceiling is 2x8 16 on
center with dead space above. *I am using R-30 batts. *Now, I know
these will stick up about 2.5" and that's fine for now. *But if
someday I put a rough floor up there for storage and compress it,
what's the downside if any? *Does compression hurt the R value? *It
seems to me I would still be better off then using R-19.

Thanks,
Jim- Hide quoted text -

- Show quoted text -

I'm missing the math, but this is a garage with 2x8 rafters spanning
19'. I will be putting R30 (9.5") up there and if I do put some
plywood on top for a little storage it will compress it to 7.5". So
it sounds like even with the compression I'm better off then the
alternative of R19.

Am I off base?

-Jim