Seal board joints or tile backerboard with ease using this FibaTape cement board tape. The self-adhesive tape works with cement applications. Use it with dry or thin-set mortar. The white tape measures 150 ft. x 2 in. Vinyl-coated, the material embeds on the board's surface for added strength to withstand flexing that can lead to cracks. The alkali-resistant tape works outdoors or indoors and helps prevent mildew and mould growth. Made with heavy fibreglass yarn, it clings to corners for uniform joint support. Apply it as a DIY solution in high-humidity areas where moisture intrudes, such as kitchens and bathrooms. Strong enough to keep both cement board and drywall together, the tape helps prevent the sheets from pulling away from each other. This drywall tape holds up during temperature changes and won't contract or warp.