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thevoz 01-09-2010 03:01 PM

crawl space insulation
crawl space floor joist should i use unfaced R19 isulation and then plastic or no plastic or something eles?

Mark Harvey 01-09-2010 03:53 PM

Crawl space
Yes, use plastic. Use a 6 ml (fairly heavy duty), thinner won't hold up.

canyonbc 01-09-2010 04:17 PM

if you use batt insulation I have used 6 mill plastic.

A lot of people in our area are moving towards the spray foam insulation. Do not no to much about it but might be something others can comment on and something you may want to use.

Gary in WA 01-09-2010 06:00 PM

The latest, and the science behind it:

Be safe, Gary

Wildie 01-09-2010 09:41 PM

In my area (Canada) we do not insulate the floor, we insulate and seal the outside walls and make the crawlspace part of the conditioned envelope.
My place was built with vents, but these have been closed for many years.

The above link is very informative!

" The easy answer is to construct a conditioned crawlspace . Construct it like a “mini-basement.”

Scuba_Dave 01-09-2010 10:22 PM

Dirt floor ?
If so you need a vapor barrier over the dirt too
My last house had both....perimeter insulation & floor insulation
Vapor barrier on the dirt

House stayed warmer, crawl space stayed well above freezing

Gary in WA 01-09-2010 11:56 PM

Hey, don't blame me, Wildie brought it up........ Location, location, location:

A surprise with ducts in the crawl: (find the surprise!)

Foam on the walls: If you go conditioned, need air exhaust or inlet/outlet:

Don’t melt the permafrost, and the benefits of a conditioned crawl:

If you go conditioned, take care of the radon:

Be safe, Gary

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