Installation Guide

DITRA will forever change
the way you lay tile.
Ceramic and stone tiles are durable, easy to maintain, and hygienic, representing the ideal surface coverings.
However, today’s lightweight construction methods can make the installation of hard surface coverings particularly
challenging. In order to protect the integrity of the tile assembly, an underlayment that performs multiple functions
is required.
Schluter
®
-DITRA is specifically designed to allow the installation of ceramic and stone tile over any even and
load-bearing substrate. The integration of DITRA’s uncoupling, waterproofing, load-distribution, and vapor
management functions makes consistent results viable.
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Helpful
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Uncoupling
Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or
forgiving shear interface, within the tile assembly. DITRA provides uncoupling through its open rib
structure, which allows for in-plane movement that effectively neutralizes the differential movement
stresses between the substrate and the tile, thus eliminating the major cause of cracking and
delaminating of the tiled surface.
Waterproofing
DITRA provides reliable waterproofing in interior and exterior applications. Its polyethylene
composition protects the substrate from moisture penetration, which is particularly important in
today’s building environment where most substrates are moisture sensitive.
Vapor Management
The distinguishing feature of DITRA is the existence of free space created by the configured
channels on the underside of the matting. The free space provides a route for excess moisture
and vapor to escape from the substrate that could otherwise cause damage to the tile layer above.
Thus, DITRA effectively manages moisture beneath the tile covering.
Support/Load Distribution
When placed on a solid foundation, columns or pillars can support tremendous loads. The same
physical principle applies to DITRA installations. Column-like mortar structures are formed in
the cutback cavities of the matting. Loads are transferred from the tile covering through these
column-like mortar structures to the substrate. Since DITRA is virtually incompressible within the
tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution
capabilities. The ability of DITRA installations to support and distribute heavy loads while preserving
the integrity of the tiled surface has been verified through extensive laboratory and field testing,
including applications exposed to vehicular traffic.
Specifically designed as an underlayment for
ceramic and stone tile
Schluter
®
-DITRA