A 20x40 tarp is the perfect emergency tool. In case the roof begins leaking during or after a storm a 20 x 40 tarp is a great solution. But these tarps can be used for so many other occasions. Perhaps you want to temporarily cover your boat, car, or use one as a ground cover when you have a painting job. A tarp is a very inexpensive way to get peace of mind. Planning a D-I-Y project? Need a versatile, waterproof, rot-proof material? You should take a look at this tarp.