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Ditra Crack Isolation Membrane for Ceramic Tile Installations

Schluter Ditra Anti-Fracture / Waterproof Membrane

All work by: Harry Dunbar

Construction materials used in new homes today are susceptible to expansion and contraction. A ceramic tile or stone installation isn't meant to adjust itself in relation to movements in the substrate, and over time the ceramic tile will deflect relative to the stresses they are subjected to. In other words ... for every action, there is an opposite and equal reaction. In today's world without a proper substrate, the reaction results in a short lived ceramic tile installation.

Normal movement of the substrate is absorbed within the Ditra membrane and not transferred to the ceramic tile or stone installation.


Schluter Ditra Anti-Fracture Membrane

The Ditra has been installed over the existing plywood subfloor using a polymer modified thinset mortar. The ceramic tile will be installed over the Ditra using a non-modified mortar

Ditra was the only choice I had in this commercial office area where a type of gypcrete was used to build the substrate.
 
I'll use it to cover heating cables for a floor as shown in the next photo.
It's ideal for exterior work when waterproofing is required.
Schluter Ditra Anti-Fracture Membrane I've used it over this small mortar bed because I wasn't completely happy with the thickness in some areas. Also, the fact that this is a sunroom means extreme temperature changes which may cause movement.
BEFORE SETTING TILE

Ditra will allow expansion and contraction of the subfloor (plywood and joists) without transfering movement to the ceramic tile or stone installation and causing failure.
AFTER SETTING TILE
BEFORE SETTING TILE
AFTER SETTING TILE

BEFORE SETTING TILE

The concrete was porous and cracked in places so I added a primer before installing Ditra to increase the bond of the thinset.

If any hairline cracks exist or develope later, the Ditra isolation membrane will prevent movement from effecting the tile installation.
AFTER SETTING TILE


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