Grout serves as the rigid filler between tiles, locking them into place and preventing debris from settling in joints. It is typically cement-based or epoxy-based and is designed for stability rather than flexibility. Because grout is rigid, it cannot accommodate the natural expansion and contraction that occurs at the junctions where walls meet floors or where two planes of tile intersect. Over time, applying rigid grout in these areas will lead to cracking. Silicone sealant is a flexible, elastomeric product that is used specifically at these perimeter points and change-of-plane transitions. Its primary function is to provide a waterproof barrier while allowing for structural movement without cracking. While grout is porous or semi-porous depending on the type, high-quality silicone is fully waterproof and acts as an expansion joint. Using the correct material for the right application is essential for maintaining a long-lasting and leak-free tile installation. If you notice cracking at corners, it is often a sign that rigid grout was used where a flexible sealant should have been applied.
Key considerations
- silicone vs grout
- when to use caulk
- tile corner joints
- Grout
- Silicone
- Caulk