irvinehomeowner
Well-known member
Sanded grout with rectified tiles is not a good mix.
You can look it up but the reason why rectified tiles are so sharp is because they are cut AFTER they are fired which allows for thinner grout lines. Thin grout lines uses non-sanded grout (usually a polymer) because it needs to be able to seep into the thinner space.
Sanded grout is for wider grout lines and has more "give"... if not allowed to set properly before being sponged, you will see that type of "trough effect".
You should get a flooring installer to take a look and he will explain it to you. The only reason I am familiar with this is because we had travertine in one of our houses with what they called "zero grout lines" and this was explained to us.
It's also what they like to do with wood-looking tiles to achieve a more wood look with thinner grout lines (see the thread that OpenSky posted about that).
You can look it up but the reason why rectified tiles are so sharp is because they are cut AFTER they are fired which allows for thinner grout lines. Thin grout lines uses non-sanded grout (usually a polymer) because it needs to be able to seep into the thinner space.
Sanded grout is for wider grout lines and has more "give"... if not allowed to set properly before being sponged, you will see that type of "trough effect".
You should get a flooring installer to take a look and he will explain it to you. The only reason I am familiar with this is because we had travertine in one of our houses with what they called "zero grout lines" and this was explained to us.
It's also what they like to do with wood-looking tiles to achieve a more wood look with thinner grout lines (see the thread that OpenSky posted about that).