Charlie: Alright, Michael’s installing some new doors and windows himself, in Hufsmith. He writes to us, he says, “Could you please let me know what you think of the best material for the window and door cavities? It’s less than an inch, and one installer recommended a close cell backer rod. Another installer was the exact opposite, and he recommended a spray foam.” What would you put in there, Tom?
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Tom: You know what, either way is fine. It’s just a small little filler. Be careful with the foam mixer. It’s non-expandable. If you put that expandable foam in there, it’ll just keep expanding until it’s like the blob growing out. So, if you use non-expandable foaming, I think that’ll be more common, but the backer is easier for a do-it-yourselfer to get their hands on. So, I think probably the little foam backer rods are going to be fine.
Charlie: All right. Where would you use an expandable foam? What’s that for?
Tom: I don’t know. They sell it in the can, and it’ll pull siding right off the house if you’re not careful. I mean you have got to be really careful with the expandable stuff.