Ditra Uneven Floor

Can schluter ditra and schluter ditra xl be installed over vinyl flooring.

Ditra uneven floor.

First time floor diy i would like to install porcelain stone or thin brick on my 1955 kitchen and hall floor. A seasoned floor that never sees moisture you could skip the ditra. Multiple layers of vinyl is unacceptable. The subfloor must be free of moisture damage including rot and sponginess and must be securely fastened to the joists and squeak free don t lay tiles on a concrete slab with cracks that appear to be spreading or irregularities that prevent you from leveling it.

It s completely waterproof and it allows the subfloor and tile layer to move independently. Cushioned vinyl is unacceptable. Megabond from lowes or kerabond are good un modified thin sets. Ditra xl allows for ceramic tile application over single layer plywood osb subfloors on joists spaced at 24 610 mm o c.

Some limitations include the following. I plan to use the thinner ditra uncoupling membrane. Tile installers usually use cementboard as a tile underlayment over a standard plywood subfloor but as home flooring pros advises there are situations for which an uncoupling membrane is a better choice. Before laying tile or installing a tile underlayment like schluter ditra it s important to check the subfloor to ensure a flat even surface at its worst a very uneven floor will result in broken or loose tiles and cracked grout joints.

The subfloor is 3 4 x 7 tongue and groove plank with some knots set on the diagonal. Yes schluter ditra or ditra xl can be installed over vinyl. Floor joists are 1 75 x 9 16 oc longest support span is about 12 feet. Un modified under and over the ditra.

There are various types of tile underlayment but all serve to smooth out uneven spots in a subfloor and create an unbending layer that prevents the floor from flexing underfoot. Perimeter bonded vinyl tile is unacceptable.