Personal tools
log in | join | help

I live in St. Pete, FL, and want to know more about closed-cell foam insulation for my crawlspace. Is it safe to use?

by LiveModern Webmaster last modified Jan 04, 2012 02:15 AM
Editorial Rating: 1 2 3 4 5
Average Rating: 1 2 3 4 5 ( 0 votes)
by last modified Dec 16, 2010

The house is hot and moist during summer, freezing in winter, and I believe most of it is due to the crawlspace. House was built in the '50s.



Even in dry climates, you'd be amazed how much moisture comes through the floor.

I think closed cell insulation might be ok, but when I think about using it I always ask the question: is moisture going to get trapped by it? Human habitat has moisture that could get trapped in, and possibly harm, the floor joists, but I hope someone else will weigh in on this, too.

My first thought, and it is cheaper than home foam insulation, is to:

  • lay a vapor barrier in the crawlspace,
  • run it up the foundation walls and seal it,
  • then add positive ventilation in the crawlspace with a small fan built for this purpose,
  • then insulate the floor with any insulation that is designed to fit between joists, such as cotton batts or formaldehyde-free fiberglass, or cellulose in a netted installation.


For more information:

Read Florian Speier's Q&A "We have an unheated crawlspace under our house that we would like to insulate."

Also, read Danny Kelly's Q&A "What kind of waterproofing can you use in crawlspaces to help with going green?"




Website migration, maintenance and customization provided by Grafware.