You must prepare the surface of the deck properly before the TileDek membrane can be installed.
Make sure deck surface is made of 3/4" tongue and groove plywood, glued and screwed to the joists.
It is possible to install TileDek membrane directly to plywood but
this requires filling all knots and low areas with fast setting cement
floor levelling compound and sanding smooth all joints and rough spots.
Even better is to use cementitious fiber board. Durock is one
brand but there are others. Cement board makes an excellent substrate.
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