How big is the seam that Chaoshan people say?

The unit for measuring the width of tile houses, the tile houses in Chaoshan, are arranged in parallel rows from front to back according to the direction of the house. In principle, these rows cannot cross, so how many rows a tile house can row at most becomes the basis for its width estimation. A line is a seam. Common tile houses are 13, 14, 15 joints. The domineering one has a 18 seam.