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Started By
Message
Spray foam insulation around windows.
Posted on 8/30/25 at 8:51 am
Posted on 8/30/25 at 8:51 am
I have a drywall guy coming to replace some overly textured pieces that a previous homeowner turned into a distracting swirled plaster canvas.
I’m expecting to see some poorly insulated gaps around the windows once the old stuff is removed. A previous door installer cautioned me against using spray foam in similar gaps because he claimed it could interfere with the integrity of the framing.
Was that guy full of shite? Or should I have a can ready to improve the energy efficiency around the window? Is there an ideal product I should be looking for that will not bend vinyl window framing as it expands?
I’m expecting to see some poorly insulated gaps around the windows once the old stuff is removed. A previous door installer cautioned me against using spray foam in similar gaps because he claimed it could interfere with the integrity of the framing.
Was that guy full of shite? Or should I have a can ready to improve the energy efficiency around the window? Is there an ideal product I should be looking for that will not bend vinyl window framing as it expands?
3
Posted on 8/30/25 at 9:00 am to Willie Stroker
do not underestimate how much force expanding spray foam can exert. it can and will blow out wood framing and trim and should be used sparingly if at all. a better application would be a flowable sealant or caulk
Posted on 8/30/25 at 9:35 am to Willie Stroker
There is an expanding spray foam made specifically for this. The blue can from Great Stuff is for doors and windows. I’ve used it for hundreds of windows and doors with zero problems. It’s great stuff.
Make sure it’s the blue can. Let it dry before trying to clean up the excess.
Also, caulk is an option if the gaps are not too wide. A backer rod may be needed.
Make sure it’s the blue can. Let it dry before trying to clean up the excess.
Also, caulk is an option if the gaps are not too wide. A backer rod may be needed.
Posted on 8/30/25 at 10:09 am to Willie Stroker
The window and door stuff is open cell foam and doesn't exert as much expanding pressure as the regular canned closed cell foam. I've use a load of the window and door (literally a door this morning) and haven't had any problems. As a precaution I do make sure jambs that don't have much support are shimmed or blocked it a way that keeps it straight while the foam cures.
I have heard of the W/D stuff bowing jambs. I assume those are especially weak and unsupported.
If possible, foam one window and see if it had any negative affects after curing. Worst case you can get in there with a sawzall blade and hog out enough foam for the jambs to relax again.
I have heard of the W/D stuff bowing jambs. I assume those are especially weak and unsupported.
If possible, foam one window and see if it had any negative affects after curing. Worst case you can get in there with a sawzall blade and hog out enough foam for the jambs to relax again.
Posted on 8/30/25 at 11:55 am to 9rocket
quote:
There is an expanding spray foam made specifically for this. The blue can from Great Stuff is for doors and windows. I’ve used it for hundreds of windows and doors with zero problems. It’s great stuff. Make sure it’s the blue can. Let it dry before trying to clean up the excess.
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