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Samuel Anderson
Samuel Anderson

Repairing Cracked Grout From A Tile Floor



Apparently you need a specific blade designed just for grout removal. Good to know since we completely ruined another blade by using it the wrong way on our tiled fireplace makeover. This blade was more curved and much rougher than the other attachments and it helped with grinding into the grout at angles rather than straight down (where you risk breaking or lifting up a tile).




repairing cracked grout from a tile floor



Before you can apply any new tile grout you need to giveyour surface a thorough cleaning. Going over the grout lines again with avacuum and wiping down the tiles with a soft wet tile sponge should be all thatyou really need to do to prep for your new grout.


The last thing you need to do is clean off the fresh groutfrom the surface of your tile. Use a clean wet tile sponge to wipe down yourtiles, being careful to just glide over the fresh new grout lines. You may needto rinse and repeat this step a few times to clean off your tile surface.


Measure the width of the grout lines on your tile floor. If the lines are less than one-eighth of an inch, you need unsanded, epoxy or acrylic latex grout. Grout lines wider than one-eighth of an inch need sanded grout. The exception to this is marble tile floors. Sanded grout scratches the surface, so use unsanded, epoxy or acrylic latex on them.


Cut out the damaged grout with a grout saw. Insert the blade of the saw, which looks like a screwdriver or round handle with a saw on the end, into the joint with the damaged grout. Move the saw back and forth along the joint to cut out the grout. If the grout is particularly difficult to remove, apply more pressure to the grout saw as you move the saw along the joint. Take care not to damage the tiles.


Note: If you have small, hairline cracks in the grout, mix a small amount of unsanded grout and apply it directly into the damaged joint with your finger. Wipe off any excess from the surrounding tiles and allow the grout to dry.


Do you need to fix some tiles? You can do tile repair in many ways, but the most common is by using epoxy grout. This will fill any cracks and holes found in the tile and make it look new again! The process of fixing tile is not difficult at all.


This customer contacted us about repairing the grout on their bathroom tile floor: they had observed the grout separating and cracks forming around the tiles. Upon investigation, however, we realized more was needed than a simple regrout. We noticed that the tiles had actually lost their bond to the floor. When tapping on the tiles, we could hear the loose tiles move. This will often be a smacking sound as the tile hits the substrate, or a gritty sound as the sand in the joints crumbles and grinds against the tile. The video below shows the type of sound we are listening for:


Repairing grout around loose tiles will never fix the issue as a tile assembly can only absorb minimal movement. The extra movement in the tile as it is walked on will be enough to crack the tile or grout over and over. The only way to fix this problem is to remove the tiles and reinstall them to industry standards.


The next steps to repair the bathroom tile were to clean the remaining mortar off both tiles, and plywood substrate. In order to reuse the existing tiles, we had to grind the backs of the tiles. This in particular was slow work as we needed to minimize heat and vibration to ensure none of the tiles cracked.


Using ceramic or stone tiles in a home is a great way to create an aesthetically pleasing space. Tiles can provide a durable water resistant barrier on floors, walls, and in shower or bath enclosures. With so many color and textured options, tiles surfaces can allow a home to be unique and beautiful.


Grout is a material made from sand, water and cement, and is installed between tiles where tiles meet other surfaces. Grout helps to fill gaps and create a water resistant seal. It is common to find cracked grout at locations where the tiled surfaces meet other surfaces, such as at floors or countertops. Grout is not an elastic material, and will not stretch when building materials expand and contract, or when building structures settle. Therefore, when movement occurs grout can crack.


Cracked grout lines at countertops and floors are a common defect in newly built homes, and cracked grout repairs is one of the most common warranty claims for new construction homes. It is also common to find grout cracks inside tiled shower enclosures. These cracks when exposed to excess moisture can allow water to leak into walls and floor, and could cause substantial damage over time if not addressed. Best building practices calls for sealant to be installed at shower enclosure corners and transitions to prevent cracking and water intrusion issues.


Tile grout is vital to maintain and repair throughout its lifespan beca