You have two different 24 x 24 tiles for two different floors.
Grout size for 18x18 travertine tile.
Let s talk about grout size options.
Note that using the smallest grout possible will increase installation time.
The difference is not really noticeable visually but can make a big difference to the quality of the installation.
If one of the tiles is fairly flat with minimum warping cupping you may meet the proper coverage requirement using a 3 8 square notched trowel.
How to install 18 x 18 tile.
Larger grout lines will compensate for that.
Finished grout lines will vary from 1 16 to 3 16.
Daltile recommends that large tiles have a 1 8 or 3 16 minimum grout joint for the most successful installation.
Unsanded grout is a cement grout with less than 1 8 grit.
Grout lines for floor tiles as a general rule floor tiles should have grout lines of 1 8 inch or larger depending on the type and size of tile.
Although they are the same dimension each tile may require a different trowel size.
Actual finished grout spaces will vary from 1 8 to 1 4 if 3 16 spacers are used.
Large format 18 inch tiles are often used by designers to visually expand a small space.
Special types such as slate or quarry tiles often do not have edges uniform enough to look good with tight spacing.
With tile that size you need a larger grout line due to inconsistencies in the cooling process of the tile.
Grout joint for staggered brick joint patterns.
Prior to even thinking of grouting tumbled travertine tile you first need to apply a deep penetrating sealer.
Mapei does not have a grout called colorfast not sure what particular grout you re referring to but they do have a few different color consistent grouts that work very well.
Whether it is a natural stone tile like travertine or a ceramic tile like a porcelain tile all have to have a grout joint for two reasons.
Tumbled travertine tile has many dips curves holes and natural surfaces which give it its character but also makes it more difficult to grout.
Generally unsanded grout is used for tile applications with narrower grout joints from 1 16 to 1 8.
Mix up the sanded grout until it is the consistency of peanut butter.
Sanded grout is classified as a cement grout that has 1 8 or larger grit to it.
One is that there are tolerances for size variation as each tile is not always exactly the same size.
Scoop up an orange sized ball of grout and apply it to the surface of the travertine with the grout float.