20' x 18' Heavy Duty Lumber Tarp | 6' Drop & Flap - 18 oz. Black Tarp20 18 Heavy Duty Lumber Tarp 6 Drop & Flap 18 oz PVC Black This 20 18 lumber tarp is engineered for full coverage protection on the flatbed, with a 6 drop and a 12 rain flap for sealing corners and keeping freight dry. Built from 18 oz PVC coated polyester, this tarp handles heavy duty use across all seasons perfect for shielding lumber, steel, and palletized loads from wind, rain, snow, and road debris. Built to Withstand the Elements With heat