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BV002986

11:27PM | 01/09/14
Bvwindows
I recently installed a new front door and the sill is quite a bit out of level so while the door is level and secure the sill that extends towards the exterior of the house is almost floating on one side. I’ve put shims in there so it’s now supported but I’d like to fill the entire gap under that sill plate. Can I use spray foam? Will that secure it, meaning will there be any give to the sill if I use that? I’m looking for something so I don’t have to shim the entire width of these door. If not spray foam, what else can I use?

David, Moderator

08:14PM | 01/10/14
Member Since: 11/15/13
255 lifetime posts

How's it going,
I can't tell you for sure if the spray foam would work. I have never used it for that purpose. My only concern would be how it holds up over time.
If you decide to go that route, be careful. Use the foam that does not expand. If you use the expandable and are not careful, it will bulge up your sill causing a huge problem.
There are 2 ways you can handle this.
1) place shims under sill about every 4 or 5 inches and cut flush.
2) If you have a table saw, cut a wedge to fill gap.

After doing either one of these, run a nice bead of caulk to seal the gap. Use a very good grade of siliconized latex caulk.
Silicone works great but is harder to work with.
Make sure your surfaces are clean and dust free.
Thanks for stopping and good luck
David

jcaption

12:31PM | 01/14/14
Member Since: 01/14/14
85 lifetime posts
Not going to work, it's just going to compress.
Out off level needed to be addressed before door went in.
If it's off it will effect the whole door.
If there's a gap then that tells me no flashing was done under the door.
What's under the door, slab, plywood ECT.

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