If the tiles are well spaced all gaps under 1 4 then you should be able to cover the entire mosaic of 18 x 18 with 2 lbs of grout.
How to grout mosaic tile wall.
How much grout you need depends on three things.
One key to success is to remember that grout has a limited working time and can dry before you know it if you grout an area that s too large the grout will set up and become difficult to work with or remove.
Grouting is not difficult to do well but it is even easier to do poorly.
When put together over a floor or wall these small tiles contain numerous grout lines which must all be filled to.
The unique layout of mosaic tiles produces many grout lines so grouting is an important step in achieving a clean final look.
Grouting is the final step of installing ceramic wall tile after the tile adhesive has fully cured.
Small tiles or mosaic tiles typically measure 2 inches or smaller in size.
To grout wall tiles start by dividing your wall into 3 foot by 3 foot sections so you can work on it before the grout dries.
Additionally spread the grout into the joints and use the side of your float to compress it.
Then mix your grout until it s smooth and spread it across one section with a trowel.
The area of the mosaic l x w the thickness of the tiles and the gaps between the tiles.