Crawl Space Ninja® Christmas Tree Fasteners

Easy to use and worked fantastic!

Used Christmas tree fasteners in concrete block for the piers, and in the top of the 2" foam boards that were tapcon-ed to the wall. This seemed better than anchoring the fasteners to the concrete block, as near the top of the foam board, the plastic will pull at a 45 deg angle, whereas in the top of the foam board, the pull is at a direct perpendicular angle. Plus, you can simply press the Christmas Tree Fasteners in by hand through the sheet plastic into the foam board, and they are not coming out without a struggle!

They work really well on both Brick and Spray Foam walls

I installed mine through the plastic and butyl tape into 2”foam board and they hold tremendously!

I was worried these wouldn't work in my old crawlspace walls ... no need to worry. They are holding perfectly in less-than-ideal concrete! Having small hands, I used a rubber mallet to tap them in (GENTLY!!).

Great and easy to use. I also made a small flap at the ends and was able to double the holding power to the vaper barrier. Only four stars because i didn't see a fastener available that could hold my foam board. ( not long enough)