spray foam in masonry wall

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It's not , But it works pretty good.
Silicone works well, too if you don't touch it until it dries.
Then of course grout probably works best.
 
qualified said:
Can anyone tell me if spray foam is listed to secure a masonry box in an existing block wall?
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Doesn't have to be listed. After all, are your nails or screws listed? :) The only requirement is that the box be "secure". In an ICF home, the boxes are often normally fixed in place with spray foam. I've used PL-400 to hold boxes in masonry already.
 
mdshunk said:
Doesn't have to be listed. After all, are your nails or screws listed? :) The only requirement is that the box be "secure". In an ICF home, the boxes are often normally fixed in place with spray foam. I've used PL-400 to hold boxes in masonry already.
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PL-400 , Yep that'll do it. Hold just about anything together, might even hold fire and water together.
 
Spray foam works really well for installing boxes in mud adobe too, along with a couple of 6" galvanized drywall screws driven at angles.
 
I have used mortar with just a small amount of powdered drywall mud.It will set in 5 minutes while you hold it in place.25% is about all i suggest and dont mix till your inside and ready to use
 
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