New answers tagged ceramic-tile
Your tile may have been laid too close to the bottom framing boards. Tile doesn't expand the way wood does but it does expand. The solution would be to remove the baseboards, cut an expansion gap into the tile and re-install the baseboards.
I accepted answer but wanted to provide my line of thinking also, and some facts that were missing in initial question, and that is that length of the tile is 18" and that there will be a 1" overhand over the circle. Here is how I calculated it: Circumference of the circle is 43.98, let's round it up to 44. Since I want the tiles at the end not to be cut, ...
For your circle & tiles: 12-1/4 inches if you leave the tile full-width at the outside edge - tile plus grout. 2 pi R is circumference - 43.923 feet. 527.79 inches. Divide by 12.25 to get number of tiles. 43.084 - depending on the project, you either figure 43 is close enough (0.27 inch grout line rather than 0.25) or you use 44 tiles and trim more ...
Assuming you are just going to tile a simple circle with a radius of 7', the calculation is easy to estimate number of tiles. πR2 = Area I'm going to use inches here: Radius is 84" = surface area of 22,156" squared. It wouldn't be out of the question to calculate the number of tiles out of this, and add in a percentage for breakage/cuts. based on a 12" ...
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