Regrouting Ceramic Tile – On the House

Regrouting Ceramic Tile

By on September 9, 2015

If there is one thing that we have learned in our many years as building contractors and home improvement journalists, it is that grungy tile grout is considered by most people to be the scourge of mankind. It is universally reviled. It is ugly, a pain in the neck to clean, and can reduce an otherwise handsome tile installation to a full-blown science experiment. Yikes! What’s worse, recent studies by the U.S. Center for Disease Control report that certain types of mold can negatively affect one’s health.

Appearance aside, tile and grout cleaning serves a very important purpose. It is a tiled surface’s first line of defense against infiltration by water. It’s the whole reason you installed tile in the first place – to protect the structural elements of your home from water damage. Albeit grout is only one part of the big picture, its job is an important one. Cracks and gaps in grout are a sure sign that water is doing its one-two punch on the substrate which can be a real knock out on the old pocket book when it comes time to make repairs.

While grout helps prevent water damage, it is not the only source of waterproofing. A top quality tile flooring installation will consist of a layer of straight and solid framing, a layer of building paper, a layer of mortar (we prefer floated mortar although precast mortar board is acceptable for a do-it-installation), and finally the tile, grout and sealer. Therefore, if the tile or grout should ever develop hairline cracks (often not visible with the naked eye) there is a layer of protection below that will prevent damage. It is for this reason that we are vehemently opposed to tile installed directly on wallboard – even if it is classified as “water-resistant.” A shower constructed of tile glued directly to wallboard is at best a repair contractors dream come true and at worst planned obsolescence.

Don’t be a victim! Take control and you’ll be money ahead. Start by keeping your grout clean. One of safest means of doing this is by using a solution that consists of one part distilled vinegar and one part water. Mix the two in a bucket and apply with a small brass brush or a toothbrush. The vinegar is a safe mild acid that will break down hard water deposits. For stubborn areas, spray the walls with vinegar and then cover the area with plastic wrap to keep it moist. This may be tedious work for a long neglected shower, but will become history when you follow the forthcoming maintenance steps.

If vinegar doesn’t do the trick, try using hydrogen peroxide (the same stuff used on cuts). Here again, a bit of scrubbing will help cut the grease. If mildew is the problem, use the following solution: one-third cup of powdered laundry detergent, one quart of liquid chlorine bleach and three quarts of warm water. Add the bleach to the water first, then the detergent, and mix thoroughly. Even though the solution is mild, be sure to wear rubber gloves, safety goggles and have plenty of ventilation. For large areas, put the solution in a spray bottle and spray it onto the surface. Allow it to sit until the black mildew stains have turned white (usually five to fifteen minutes), but don’t allow it to dry. Rinse with fresh water, dry and seal with a high-quality acrylic or silicone tile and grout sealer.

Once clean, if cracks are obvious or the grout is stained, discolored or just plain ugly, it’s time to regrout. This process involves removing a small amount of the uppermost layer of grout and replacing it with a fresh new layer of grout. Both appearance and waterproofing are improved and, save for the olive green or pink tile, the surface looks brand spanking new.

When we first wrote on this subject over a decade ago we recommended that a church key-style beer can opener be used to scrape away the upper layer of grout. Those were the days when it was easier to use our backs instead of our heads. Some years later we discovered a nifty tool called a grout saw – a small hand tool about the size of a toothbrush that consists of a handle attached to a small flat piece of steel covered with carbide particles. Take it from us, it is much more effective than the can opener and requires a lot less elbow grease. Now, thanks to modern technology, there is a lazy mans alternative – a power tool! A grout removal tool can be attached to a rotary tool to remove grout as effectively as your dentist grinds old fillings out of your teeth. Just be careful not to get crazy and grind the edges of the tile.

Once the upper crust has been removed – usually about an eight of an inch – vacuum away all of the dust and rinse with fresh water. Next, mix up a batch of new grout to a consistency of cake icing and apply it using a rubber grout float. Hold the float at about a 45-degree angle to the tile and, working in a diagonal direction to the tile, force the grout into the joints. Excess grout should be wiped off or “struck” using a damp sponge and fresh water. Wring the sponge out frequently to keep the tile clean and free of wayward grout. In short order, the grout will begin to dry and a haze will develop on the tile. This haze can be polished away using a piece of cheesecloth.

The final step, sealing the grout and tile, can’t be performed for about a week until the grout has had time to cure and dry. Use a high quality tile and grout sealer. We like one with a silicone resin. Epoxy is the best and should be used for added water resistance where tile is glued directly to wallboard or where extra stain resistance is needed such as with kitchen counters.

For more home improvement tips and information search our website or call our listener line any time at 1-800-737-2474! All you need to do is leave your name, telephone number and your question.

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