Spray Foam Between Sill Plate And Foundation? - Insulation - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation


Thread Tools Search this Thread
Display Modes
Old 10-21-2014, 02:25 PM   #1
Join Date: Oct 2014
Posts: 1
Rewards Points: 2

Spray foam between sill plate and foundation?

My recently-purchased 1949 one-story ranch has a crawl space with untreated sill plate resting on top of a somewhat wavy (in places) foundation wall. There's tar paper or something like that between the wood and concrete.

Because the top of the foundation isn't perfectly flat, there are large areas with about a 1/2" to 3/4" gap between the sill and the concrete. The original builders shimmed it in various locations.

Mice infested the crawl space and batt floor insulation in the past, and I removed it over the summer (nasty). I'm doing everything possible to exclude rodents and was thinking that I should stuff some copper mesh into the gaps between the sill plate and the foundation, and then squirt some canned spray foam over that (between wood and tar paper).

Is there any reason I shouldn't do that?

My only concern is that this might somehow lead to rot issues since I live in the maritime Pacific Northwest, but if spray foam does not wick moisture then I should be good, right? The exterior vinyl siding is in good condition and does prevent our constant rain from getting the sill and nearby framing wet.

jimcrook is offline   Reply With Quote
Sponsored Links
Old 10-21-2014, 02:38 PM   #2
Exterior Construction
Windows on Wash's Avatar
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 26,027
Rewards Points: 848
Blog Entries: 41

The tar paper is serving as the capillary break so it should be fine.

Make sure the water can still drain out if need be and do it from the inside surface.
Windows on Wash is offline   Reply With Quote
Sponsored Links

mice , rot , sill plate , spray foam

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Waterproof Sill Plate, or Foundation, or French Drain? kgkg Concrete, Stone & Masonry 10 10-12-2013 12:32 AM
Replacing sill plate - foundation wall repair NWChris Building & Construction 0 09-14-2013 12:05 PM
Joists, Sill Plate, Foundation and broken main beam Bonebag Building & Construction 14 02-03-2013 07:40 PM
big gap bwtn foundation and sill plate oldhouse49 Building & Construction 3 10-21-2011 07:19 AM
sill plate repair over block foundation MARLE Building & Construction 14 05-04-2009 08:03 PM

Top of Page | View New Posts