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This Technical Advisory deals with TCNA handbook listed & detailed methods for Exterior Walls and Interior Walls over Masonry or Concrete Methods and Solid Backing:
EXTERIOR WALLS (Ceramic, Porcelain and Glass Tile) - pages 127-130
These methods have the highest environmental rating – Res 6 / Com 6. However, bear in mind that waterproofing is not a requirement. If it desired, then it must be clearly specified. The exception is method W244E (cement backer board over wood or metal studs). A membrane is required in this method; however, its location (whether over the framing or directly beneath the tile over the face of the cement backer board) is left up to the design professional to specify. Our preference is to place the waterproofing over the cement backer board. In this location, it protects the fasteners and the connections to the framing. If a water resistive barrier is also required, waterproofing can still be applied over the face of the cement backer board.
A note appears under membrane options; which mentions that local building codes should be consulted to determine if a water-resistive barrier (typically 2 layers of 15 # builders felt), waterproof membrane or vapor retarder membrane is required.
Some other notes of interest:
o Not all bonding mortars are suitable for exterior use
o Protection of installation may be required to prevent premature exposure of setting materials to moisture.
INTERIOR WALLS OVER MASONRY OR CONCRETE (Ceramic, Porcelain and Glass Tile) - Pages 131 – 133
As in the exterior details, a membrane is optional.
These methods have environmental ratings of Res 1,2,3,5 / Com 1,2,3,5. Therefore, only high humidity / heavy moisture (Res 4 / Com 4 – e.g. steam rooms) and exterior (Res 6 / Com 6) applications are excluded. The exception is W215 (Epoxy Spot Bond Method) which can only be used in dry areas (Res 1 / Com 1).
INTERIOR WALLS OVER SOLID BACKING (Ceramic, Porcelain and Glass Tile) - Pages 134 – 137
There are 3 methods in this section. As in the exterior details, a membrane is optional.
This section includes another example of the versatility within a given installation method. Methods W221 and W222 have environmental ratings of Res 1,2,3,5 / Com 1,2,3,5 with masonry backing (e.g. brick or block). With gypsum board or plaster backing the environmental ratings drop to Res 1, 2 / Com 1, 2 and drop further with wood backing to Res 1 / Com 1.
These methods can be suitable for exterior applications when flashing, waterproofing and appropriate material selection is considered. If used in exterior applications, certain notes / conditions will apply.
Method W223 (organic adhesive over solid backing) is only suitable for Res 1, 2 / Com 1, 2 interior only applications.
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