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.
Grout size for 18x18 travertine tile.
Because they have fewer grout lines than smaller tiles they make for a more.
Finished grout lines will vary from 1 16 to 3 16.
Let s talk about grout size options.
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.
One is that there are tolerances for size variation as each tile is not always exactly the same size.
Grout joint for staggered brick joint patterns.
Note that using the smallest grout possible will increase installation time.
Tumbled travertine tile has many dips curves holes and natural surfaces which give it its character but also makes it more difficult to grout.
If smaller spacers like 1 8 are used it will accentuate the size difference of handmade tile.
Actual finished grout spaces will vary from 1 8 to 1 4 if 3 16 spacers are used.
Daltile recommends that large tiles have a 1 8 or 3 16 minimum grout joint for the most successful installation.
You have two different 24 x 24 tiles for two different floors.
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.
Scoop up an orange sized ball of grout and apply it to the surface of the travertine with the grout float.
Larger grout lines will compensate for that.
Mix up the sanded grout until it is the consistency of peanut butter.
Although they are the same dimension each tile may require a different trowel size.
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.
Unsanded grout is a cement grout with less than 1 8 grit.
Prior to even thinking of grouting tumbled travertine tile you first need to apply a deep penetrating sealer.
The difference is not really noticeable visually but can make a big difference to the quality of the installation.
Most floor tiles are 8 inches by 8 inches but larger versions are available.
Generally unsanded grout is used for tile applications with narrower grout joints from 1 16 to 1 8.
With tile that size you need a larger grout line due to inconsistencies in the cooling process of the tile.