Grout should sit for around 10 minutes. Allowing the mixture to sit gives any dry bits time to absorb water before you mix it again. A pro may add more water if the mixture is still a bit dry.
A competent tile installer uses a self-leveling compound, like thin-set, to create a flat surface before laying any tile on the floor. Some floors are not level, so check them with a straightedge.
Your pro should remove the baseboards from your floors before laying tile. When the baseboards are removed, the tiles do not need to be quite as precise, so he or she can work quickly.
Some installers use chalk lines to guide their tile placement, but these can be difficult to see, and tiles can move. Guide boards hold tiles in place and are much more obvious than chalk.
Check that your pro has cleaned any excess thin-set from joints and on the tiles as soon as possible. He or she should remove the excess with a tile spacer or utility knife before it hardens.
Your pro should moisten the concrete of the bare floor with a sponge and add latex additive to the thin-set, rather than water, when mixing it. This slows the drying process, which is helpful.
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Create a staging area in your home where your installer can prepare.
Ask your installer if there are tools or supplies he or she needs.
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