Joint Sealant

Joint sealant is used to create waterproof connections between compatible components in tile-ready waterproofing assemblies. Depending on the product and system, it may be used at backer board seams, inside and outside corners, fastener penetrations, transitions, and connections between shower system components.

Many joint sealants in this collection are specifically designed for use with compatible waterproof foam backer boards or building panels. They can help seal panel joints, corners, fasteners, and transitions, but compatibility varies by manufacturer and waterproofing system, so always verify the approved installation method before selecting a product.

Some waterproof joint sealants are formulated to provide both sealing and adhesive properties. Depending on the specific product, they may bond compatible building panels, shower bases, curbs, benches, niches, and other system components while maintaining a waterproof connection. Refer to the manufacturer's requirements for approved bonding applications.

Depending on the waterproofing system, joint sealant may be used to waterproof fastener penetrations, corners, seams, transitions, and other vulnerable connection points. Application requirements can differ between systems, so the appropriate sealant coverage, thickness, and treatment should follow the instructions provided by the product and system manufacturer.

Many joint sealants intended for tile-ready waterproofing systems are designed to become part of the surface beneath the tile installation. However, thin-set mortar compatibility and required curing conditions vary by product, so confirm the sealant manufacturer's requirements before installing mortar or tile over sealed areas.

Coverage depends on the specific sealant, bead size, joint dimensions, number of seams and penetrations, and the waterproofing system being installed. Check the manufacturer's stated coverage for the selected product and calculate the total joints, corners, fasteners, and component connections that require sealing before ordering.

Cure time varies by formulation, application thickness, temperature, humidity, and installation conditions. Some products may allow subsequent installation steps before reaching a complete cure, while others have specific waiting periods. Follow the manufacturer's curing requirements before covering the sealant or exposing the assembly to water.

Start with the waterproofing system or backer board being installed and choose a sealant approved for those components. Consider the adjoining materials, type of connection, application location, and manufacturer requirements rather than treating waterproof joint sealants as universally interchangeable products.