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I'm not sure what the code is, but for the cost, I would use it. Theoretically, the foam should seal out any drafts, but, if there were a small spot that got missed by the foam applicator any draft could find it's way in. In an area with a lot of wind it would be even more important. A wind against the side of a house actually applies a pressure to it and if there is even a small crack, that pressure will enter the wall and push cold air into any cavity inside the wall ...... or even into the house. An example would be when you take a cover plate off of an electrical outlet and you feel cold air blowing in. That's from a leak allowing it to be forced in. Also, there are places that air will leak that you can't apply foam to. Like along the top and bottom plates of walls.

Tyvek isn't expensive when you consider how much it may save in the long run. I'm not sure, but I think the last 100 foot roll I bought was about $75?? As with anything, it's only as good as the application though.

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Q: Do you need tyvek with spray foam walls?
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form_title=Spray Foam Insulation form_header=11383 How would you best describe the area in need of insulation?*= () Wall framing is exposed / unfinished () No framing exposed - walls to remain intact () Not sure How would you best describe the nature of the project?*= () Insulation for existing home () Repair/Replace existing insulation () Insulation for new construction/addition In which place do you want to install the foam insulation ? (Mark all items you deem fit)*= [] Non-masonry walls [] Attic [] Ceiling [] Floor [] Roof [] Foundation walls [] Masonry walls


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Great question! And that stuff DOES make spots on the walls. You need to make sure you spray in no closer than 5 feet from the walls and wipe it toward the wall from there. Be careful, and youll be fine. I wasnt and had to repaint the lower half of my walls


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