Gently push the tiles together so the spacers are tight in the joint.
Gap between tiles and floor.
Gently spread the tiles and place two spacers between them one at the top edge of the seam and one at the bottom edge.
This creates a smooth final space that looks like solid tile.
For large format tiles 18 by 18 inches and larger you can actually get away with very tight grout lines of 1 16 inch or even 1 32 inch usually created by the lugs.
Look for silicone caulk at home improvement stores hardware stores and online.
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For regular format tiles between 12 by 12 and 16 by 16 inches you can stay with those measurements or go up to 3 16 depending on the tile and the look you want.
As the tiles increase in size a larger gap becomes acceptable.
Tile stores generally sell caulks that match the grout.
If you re fixing a gap between a tile floor and wall such as in a shower or a bathroom go with a silicone caulk so you can create an airtight waterproof seal.
Similar to the gap that can exist between your wall tile and tub you may have a space between the floor and your bathtub.
Place them between the tiles are you lay each one and grout straight over the top.
Whenever tile has a right angle like that grout is prone to fail so caulk is used.
Caulking is the best choice for this application.
Gap between tile floor and baseboard.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
As with any other gap near your bathtub you ll want to close the opening to prevent any possible water damage or the onset of mold and mildew.
This gap may widen over time as your home shifts.
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For smaller tiles is advisable to use small spacers.
You can try and maybe nothing will happen but if it cracks you will have to dig it out.
Never fill this gap with grout because tile grout is not flexible.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
Use silicone caulk to create a waterproof seal.