Gypsum Substrate
 |
Every Substrate Presents Unique Challenges
Bonding ceramic or stone tiles directly to gypsum concrete substrates is generally considered questionable or not recommended. The challenges associated with gypsum-based underlayments include the requirement of an extended drying period before installing tile and continued sensitivity to the reintroduction of moisture throughout the life of the installation.
|
In addition, since the coefficient of thermal expansion of gypsum concrete is substantially greater than that of ceramic tile, shear stresses caused by temperature fluctuations can result in delamination or cracking of the tile covering. This is particularly important when gypsum concrete is used as a thermal mass for radiant heated floors. With the increasing popularity of radiant heated floors, which typically utilize gypsum concrete, tile installers need a reliable installation system to address these issues.
 |
Uncoupling
Schluter-DITRA’s uncoupling function protects the ceramic or stone tile covering by neutralizing the differential movement stresses between the gypsum concrete substrate and the tile, thus eliminating the major cause of cracking and delaminating of the tiled surface.
|
 |
Waterproofing
Schluter-DITRA’s waterproofing function prevents the reintroduction of moisture to gypsum concrete underlayments, which, if not prevented, could significantly compromise performance of the underlayment and lead to damage of the tiled surface.
|
 |
Vapor Management
The residual moisture in gypsum concrete is allowed to escape through the channels on the underside of the Schluter-DITRA matting. This is particularly important since gypsum concrete must dry in order to gain strength.
|
 |
Support/Load Distribution
Since Schluter-DITRA is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution capabilities.
|
By addressing all of the challenges associated with today’s fast, lightweight construction methods, Schluter-DITRA provides a durable installation system for ceramic and stone tile over gypsum substrates.
Tile or Stone over Gypsum Concrete
View tile assembly