I used two pieces of 2" foam insulation and W&N for mine. The W&N holds perfectly. I also drew a level line across the center of the boards after they were hung so I could line things up nice and straight. Using 2" foam allows me to use any length straight pins, which lay completely flat when I push them in, instead of sticking out.
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Last edited by cindi; 09-19-2017 at 12:50 AM.