On Oct 16, 7:28*am, " wrote:
On Oct 16, 12:36 am, "Ivan Vegvary" wrote:

Got my crawl space dug out so I can move around. Want to insulate w/ R19
bats. Joists are 2x6 approx. 24 inches on center. What's the best way to
hold up the insulation? Can't staple the flanges since they need to face up
towards the heated surface. Can't use the "wire struts" since the 24" on
center is only approximate. ( 1/2 inch). Was considering cutting strips
of Mylar and stapling them to the studs under the insulation.

Any other thoughts????

Thanks!!!

Ivan Vegvary

If you EVER have moisture issues, fiberglass batts are a bad choice.
once they get moist their R value drops a lot.

closed cell expanding spray foam costs more but isnt effected by
moisture

With fiberglass R value drops proportionatly as it gets colder below
32f, at -20 it might be 20-35% less effective, Foam excells in keeping
R value stable, it also doesnt settle. R value can be double that of
fiberglass, it keeps out moisture from your home and cold or hot air
infiltration. It should be painted to keep from oxidising and covered
in small wire as rodents will burrow. R 7 foam may be 3 times as
effective per inch, than fiberglass at cold temps. But there are many
types of foam to pick.