How do I resolve a slight low spot? Is that the purposeof the recommended second layer of 1/2 plywood? I suppose I can use more screws (if its on a joist) to lower slight high spot. I'm not certain how to resolve these since they are so slight. I know that I have some slight high spots and dips in the subfloor. I don't know what you mean about the "unsupported span of the joists."ĭo you mean the greatest distance between where the joist rest on the concrete block foundation around the perimter and the smaller stacks of block scattered throughout the crawl? This weekend I will get in the crawl space and measure the distance between each joist and the height and thickness of the joists. Additionally, cement board adds no structural strength but takes up more height. Ditra does a better job of uncoupling the subfloor movement than does the cement board. It would be better for you to use ditra (over a second layer of plywood), than cement board. Consider using a leveling system like the Lash System for minimizing lippage. It'll depend if they are cupped, tile size consistency, how flat the floor is, what the edges of the tile look like and maybe some other factors.
Minimum grout joint size for these tiles is probably 3/16" or bigger. If the tiles are cupped, they will not match up well and you may have to rethink your pattern. You can do this by doing a test layout on a dead flat surface, and checking the height of the tiles where 2 ends meet the middle of the tile next to them.
If you will be installing the tile in a brick pattern, you will want to check the tile to make sure they are perfectly flat. You want to resolve any high spots or dips in the floor before you install the ditra. Consider adding an additional 1/2" of exterior glue plywood over the subfloor, and then using ditra.įor that size tile, you will need a dead flat floor, and little to no movement. Give us the details as to the joist size, on center spacing and unsupported span of the joists. Its a great product.įor tile that size, you will want a proper joist structure and substrate. I will tell you that Ditra is a product that has been around for many years and there are many miles of successful installations out there. I have never used it and so cannot comment on its performance. I think the membrane you are talking about is Custom Building Products "SpiderWeb".
0 kommentar(er)
