I know from my previous question that in most cases a cement board of some kind needs to be used. However, when the Kerdi membrane system is being used behind the tile, is it still necessary to use a cement backer board?
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Schluter says that behind the Kerdi membrane a solid backing needs to be used. They define a solid backing as :
- gypsum wallboard
- cementitious backer unit
- fibercement underlayment
- fiber-reinforced water-resistant
gypsum - backerboard/underlayment
- coated glass mat water-resistant gypsum
- backerboard
- portland cement mortar bed
- concrete
- masonry
Found this in their Shower System Installation Handbook here. Link : http://www.schluter.com/media/ShowerHandbook.pdf
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Add a link to the source of this info to make this the perfect answer. – auujay Jan 24 '11 at 21:28