Homeowner here: I’m going to chalk it up to colder temperatures, but the attic where I had the box is much warmer than outside (about 50 degrees today). Last time I did this (same roll btw) years ago it was end of summer and I remember it sticking to itself and giving me a hard time rolling it out. Is it a good sign that hitting it with a heat gun seemed to promote adhesion to the deck? I may just have to run an extension and hit all areas. Or would a hotter (60’s or 70’s) day with a blast of sunshine do the trick? The deck is clean and I’ve removed the brown paper backing. Good thing is no wrinkles I guess. I used cap nails for now.