Powdery or crumbling grout is likely to occur if the tiler.
Grout crumbling between tiles.
For every application there are specific spans of tile which can be installed before a soft joint is required.
Vacuum all powdered grout and grout chunks from the joint.
Inferior grout can be a problem.
At most tile specialty shops you can get or order sanded caulk most floor grouts are sanded that will closely match your existing grout color.
Doesn t mix the grout to a consistent thick and creamy paste.
If the space is larger than 1 8 of an inch use a sanded grout.
Doesn t wet the joints before applying the grout.
Spread sheets of newspaper or a drop cloth over the ground in the work area if you are working on a tiled surface that is not the floor if.
Measure the space between the tiles.
If the width is 1 8 of an inch or smaller use an unsanded grout.
Wipe off excess grout from the face of the tiles and smooth the surface of the grout with the squeegee.
Put on safety glasses to protect your eyes from flying grout pieces and dust.
Use a grout saw to remove the top 1 8 inch 0 32 cm of damaged grout.
But if the tiles were not adhered well and they re shifting that s going to break off little pieces of grout as a matter of that action of that movement.
Use an old paintbrush to dust out the joint.
The bottom of the joint and sides of the tile need to be dust free to get the best bond.
So the grout might just be evidence that the tiles are moving.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
When grout and water are mixed together a chemical reaction called hydration is started.
So in that case yes you may need to pull the whole floor out and re install it.
A grout saw is a small handheld blade that fits between the gaps in tile.
You do not have expansion joints in your tile.
Most grout is cement based and comes in sanded and un sanded varieties.
It is this reaction that causes the grout to go from a thick paste to a hard tile joint.
Scrape out all of the crumbling grout.
This fix is only practical for interior tile floors and when the gaps between the tiles are 1 4 in.
Use a grout saw that has a blade with a width that will fit between the tiles you re working on.
It is important to clean off excess grout from the face of the tiles with a damp grouting sponge before it hardens completely.
This will cause cracking grout and eventually tenting of your tile.
Rinse the sponge frequently in clean water to get rid of the grout but remember to use a damp not wet sponge.
