Durock 2" x 250' Interior Tape, $7.79 USD/Box, LL Flooring (Lumber Liquidators)

Durock Interior Tape measures 2" x 250' and is used for reinforcing USG cement board joints and corners, USG Fiberock Underlayment, and USG Durock Glass-Mat Tile Backerboard, as well as USG Durock UltraLight Foam Tile Backerboard. Made of alkali-resistant glass-fiber mesh, it strengthens joints of exterior cement board and interior tile applications, ensuring a strong, durable joint.