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I have watched the video on insulating basement walls and was wondering what type of anchor you use to keep the foam board in place?
in the video I use plastic anchors designed for 2" rigid foam. Some brands are Anchor and Hilti. I have since found that a Tapcon screw and fender washer are cheaper so that is what I use now.
Please see this link. HD has it.
https://www.homedepot.com/p/Plasti-Grip ... /302244947