What's the best way to measure a shed in order to buy a tarp to cover the entire body of the shed?
Ira: this measuring guide should help
One tarp is what you want to cover your garage with? If one measurement is considerably longer than it is deep, I would measure the length from the ground up, over the top and down the other side. then I would "wrap around the whole depth of it. Do you intend for this to be wrapped like a package or will you need access to it?