Definition: tub floor - A tent floor made from one piece of material, which means there are no cross-seams in the floor. Even though floor seams could be sealed they are subject to wear and tear, and they would require more frequent re-sealing. A tub floor gets its name from the way the material continues up the walls about six inches before being sewn to the walls. The purpose of this is to keep the side seams elevated so that no seams are touching the ground. A floor made out of heavy gauge polyurethane-coated nylon taffeta or oxford nylon will provide good waterproof protection.