Hello wetdec...
I DID tell you what height we recommend - if you read the post you'll see that it states a 75mm upstand is sufficient.
Where does it say that we recommend tanking the walls with Tilesafe? Please read the post. If you had 4m2 to cover then the 5m2 kit would be sufficient - obviously.
We make no claims that Tilesafe will prevent cracking due to lateral expansion or contraction - but then assuming the subfloor/boards have been fixed and screwed in accordance with recommended building standards then there shouldn't be a problem. We are talking about waterproofing - not installing a seperation layer which is the primary use for Ditra matting. But I would imagine that if tilers need to buy a product that provides a separation layer that you would be able to sell them something or help them out
Internal and external corners...well, as I said (please read the post) we provide a roll of jointing tape with our kits that is 150mm wide. This forms the wall/floor interface. To form the internal and external corners it is a case of cutting off a 300mm length of the tape and folding and forming the corner sections....we show how to do this on the Impey-showers website. Plenty of installers will choose to use various products for various applications - that is something well documented on many of the other trade forums.
You can use a self levelling compound to protect the cable on the flat areas of the bathroom - but using it in the graded area of the wetfloor, well that's bound to cause a problem - for obvious reasons.
Yes you can use the Devimat over the Aqua-Dec, LinearFlo-Dec (with linear drain) and Aqua-Grade (wetfloor former for new concrete screeds). Of course building up of layers COULD alter fall patterns - but then that's the same as with any wetfloor former - no?
Providing that the tanking, Devimat and grouting is set parallel to the gradient and thicknesses are maintained then it shouldn't make any difference how many layers you apply. Like Nick said - 5mm is 5mm.
Thanks for the warm welcome - glad we can help......oh and sorry for treading on your toes
