Actually I don't have it strapped down. I did add a layer of shingles, and have it physically connected to the 10x10 fenced run. Added corrugated metal roof panels and HWC around, over the top and down into ground aprons. I found a hopefully wonderful source for the tarps. They're called TarpsNow. The ones I ordered come with grommets on all four sides, plus there are various thicknesses and sizes. They will do custom sizes. I say all that to HOPE that all the work I've done doesn't blow away like Dorothy and Toto! Should I recalculate for sail area???? Hahaha!