I was reviewing some of my old posts here the other day for the fun of it, and it occurred to me that I'd been talking about making a large window film ("polycryo") tarp for a long time. I finally did, almost a year ago in fact, but I never showed it off. Well here it is.
It's loosely based on the plans on diygearsupply, but I messed up the dimensions a bit. The ridge line is straight, but all the edges are cat cut. I used the 1/2" double sided tape that came in the window kit to "hem" the edges. The ridge line is clear duct tape. To make the tie outs, I embedded nylon washers in duct tape. I cut off a bit from one side of every washer to make a flat edge and folded the tape over the washer with the flat edge in the fold. There's also extra reinforcing tape on the edges around each tie out. I learned all this from posts of other builders all over the internet.
The lines are all catfish drop line, which is cheap and strong enough. Each one has a short length of shock cord tied between it and the tarp tie out, maybe 5 inches worth.
The pull-outs are just surface mounted duct tape so I don't have to put holes in the plastic or bunch it up. Each one has a very short second piece of tape in the middle of it, sticky side to sticky side, so there's a space where it doesn't stick to the plastic, and you can tie things around it. I have a short length of cord around each one that forms a triangle when you pull on it and helps to spread the pulling force across the width of the tape. Time will tell if these will stay on. I hope so, since the pull-outs probably don't need much force on them, and they're connected to the guy lines with shock cord, just like the edge tie outs, so that should help.
The weight with guy lines attached, but not including stakes, came out to 381 grams (about 13 1/2 ounces).
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