well, measure twice cut once!!!!
while on vacation I had my buddy take a quick measurement of my roof so that I could buy some rubber roofing material for 1/2 price at a surplus store. Well, he must have misunderstood what I needed and the roofing is 1.5 feet SHORT!!! That's $150 wasted, unless someone needs some roofing on Craigslist... Looks like i'll now have to get more from the same company and pay shipping this time. I could make a seam but I would be PO'd if it leaked after a major reroofing project...