KERDI Ceiling Install with Large Format Tile or Slab

There is no issue installing large format tile on a shower ceiling with KERDI/KERDI-Board provided the structure construction (i.e., joists and wall board on the ceiling) are designed and installed to carry the load. 


We state this in the Shower Handbook with the following:


"When KERDI/KERDI-DS and tile are installed on the ceiling, the solid backing and fasteners must be able to support the load of the tile and setting and grouting materials."

By leaving out any qualifications on the load capacity of KERDI, we are saying there is no issue with the bond of the KERDI to the solid backing, or the tile to the KERDI/KERDI-Board, provided both are installed properly. The stress on the KERDI/KERDI-Board is no different when installing 12"x12"x3/4" vs 2"x2"x3/4" tile. 


The following calculation shows this in detail. The weight of granite is approximately 1lb per cubic inch. This means the total weight of a 48"x48"x3/4" slab would be 1728 lbs. That is 0.75 psi (1728 lbs/2304 in2 = 0.75 psi). The tensile bond strength of KERDI is greater than 29 psi. Therefore, there is no issue even though overall the large format tile or slab is very heavy.


Additionally, encouraged and best practice would be to install the slab on the ceiling first followed by the wall tile. This way the wall tile can act as an insurance policy in case of a failure (poor installation). Installation should always include a full spread of mortar with the correct trowel size and back-buttering to meet the ANSI requirement 95% bond coat coverage.  





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