Have you been planning a D-I-Y project for a sheltered carport or other structure where you need a versatile, waterproof, rot-proof material? You should really take a look at PTM Heavy Duty Poly Tarps. You have a choice of silver, tan, clear, white, green, orange, red or yellow so you can blend the covering in with the color of your home, garage or temporary structure. Many customers use a heavy-duty poly tarp to cover boats, ATV's and other motorized vehicles during the off-season. These tarps include grommets spaced approximately every 18 inches on all four sides for maximum efficiency and convenience.
* Please Note: PTM brand tarps only offer a warranty against manufacturing defects found within 5 days after delivery. Any damage to or failure of the product while in use is not covered by the manufacturer’s warranty. For tarps offering a manufacturer’s warranty, please view tarps available from our other manufacturers.
* Also Note: Finished sewn size will be 4-6 inches shorter than original cut size of 20' x 40'
* Also Note: These tarps must be attached with elastic bungees to meet warranty standards.
Will this size tarp cover enough space to house a group of 50 people seated at 6 rectangular tables?
That is hard to determine without knowing the size of the tables and how many people you will have sitting at each table.
Unfortunately, this is something you would have to figure out by measuring the tables and finding out how many people will be at each table. Then you can figure out how to set them up under your 20' x 40' tarp, or determine if you need a bigger size.