How do I replace grout in my shower?

Replacing shower grout is a manageable DIY project that can refresh your shower's appearance and prevent water damage. The key is thorough removal of old grout and proper application of new grout with adequate waterproofing.

Start by removing the old grout using a grout removal tool, oscillating multi-tool, or manual grout rake. Remove grout to a depth of at least two-thirds of the tile thickness - shallow removal leads to poor adhesion and early failure. Clean out all loose debris with a vacuum and damp cloth. For shower areas, inspect the underlying surface for any signs of water damage or mold that may need addressing before proceeding.

Choose the right grout type for your shower environment. Epoxy grout offers superior water resistance and stain protection, making it ideal for shower walls, though it's more challenging to work with. Sanded grout works well for joints wider than 1/8 inch, while unsanded grout suits narrower joints. In Ottawa's climate with temperature fluctuations, ensure your grout has good flexibility to prevent cracking.

Apply the new grout by working it into joints at a 45-degree angle using a rubber float, ensuring complete fill without air pockets. Remove excess grout with the float's edge, then clean tile surfaces with a damp sponge before the grout fully sets. Allow proper curing time - typically 24-72 hours depending on humidity levels common in Ottawa homes.

Critical waterproofing step: Replace caulk around tub edges, corners, and where tile meets fixtures. Use 100% silicone caulk rated for bathrooms, as this flexible seal prevents water from getting behind tiles where grout cannot flex with building movement.

For extensive grout replacement or if you discover water damage during removal, consider consulting with experienced bathroom renovation contractors who can assess whether underlying waterproof membranes need attention.