Great project, see article below.
This beautiful home and two outstanding decks are made for outdoor entertaining. The only problem is the seemingly endless expense of repair. The home owner was clear they are tired of being told "stories" from contractors and having to pay and pay. As we began discussing the Duradek options they quickly went from a classy design to the Tiledek membrane. I would have to agree for as nice a view and the amount they entertaining they do; Tiledek was an excellent choice.
The lower level is over living space and had suffered some leaking and water damages. Over head is the upper deck, basically the roof of the lower deck and it too had a small area over living space. 
There was a liquid applied coating of some type applied over a plywood substrate that had failed once and when called the installation company charged them more money to add another coat to "fix" the problem. Not long after the problem was back and the leaking continued. Why? that is what the home owner didn't understand. Why did it happen and why would somebody make all the promises etc about the product? Part of this falls on the home owner to actually investigate the product and get the history, warranty, experience, training.
It doesn't take much to look up a products approvals if they have any or simply tell the installation company you want to see the ICC approvals before they do anything. Make sure that they meet building code and if not sure call the local building inspector for assistance. This is a good example of being sold a poor product that does not have the proper approvals for a deck over living space. With just a minutes time a layman can see that coatings in general are allowed to retain up to 15% moisture, so how can that be considered waterproof? It's just smoke and mirrors, creative marketing. 
For this job a couple of bids from Duradek trained installers had inspected the decks and each submitted a formal bid. MBL of Kaysville, UT was awarded the job. First thing was to determine what kind of water damages had been
done under the coating, It looked good above while the significant damage was happening below. While tearing up the damaged substrate they came upon the cause of the ponding water on the deck too. The deck surface had been designed with plenty of slope but there was a problem between trades during the build. The brick siding was actually higher than the substrate itself. here is where somebody should have addressed the issue but didn't. Rather then correcting the problem they simply added another sheet of 1/2 plywood to the already installed 3/4inch, closer but still lower than the brick. Ultimately what was done was the substrate was laying on top of the brick causing a reverse slope and that is why the water would pond around the outer edge. Once this was found the only way to properly correct the problem was to tear off the old substrate and re sheet it with new plywood. The joist's had 1/4 in 12" slope all ready on them but still lower than the brick, a 2x2 was glued and screwed to the joist providing proper height over the brick and excellent slope
With the new plywood down the next step was to use Mapei's Ultaflex 2 as a bond coat and Durarock cement board screwed down. One of the concerns when considering using tile or stone outdoors is movement and this step aids greatly in reducing any movement and thus problems with the tiles popping or cracking. Durarock (like all the other product used) approves of their cement board being used in this application. This is significant because it eliminates the optional finger pointing and "blaming" of wrong products used thus causing the failure.
Mapei's Ultra Flex 2 was used as a bond coat for the CBU as well as being screwed down.For the outer edge Duradek's PVC coating drip edge was installed allowing the Tiledek membrane to be welded to it providing a water tight finish.
Tiledek 60 mil membrane meets or exceeds a multitude of needs on this job, we bring roofing standards and practices to the tile industry. The TCNA (Tile Council of North America) calls out for a roofing membrane to be used when using tile over living space but stops short of specifying a thickness. Yet when roofing 60 mil is required over living space, so why the gap?
Once the Tiledek membrane is fully adhered it is ready for tile. Here the deck was large enough that the tile setters where already installing the tile while the membrane was getting the finishing details. Mapei's Granirapid thinset was used for setting the tile.
Imagine the delight of sitting on your new beautiful tile deck with your friends and family, barbecuing, relaxing and taking in the view.