I would install 10 mm marmox insulated backer boards fixed with spf adhesive then slc over heatmat minimum 6 mm imo then install ditra with spf adhesive then tile.
Ditra matting installation underfloor heating.
Whether you use ditra xl 1 4 inch hardibacker or whatever is up to you.
Substrates for ditra matting.
What you can do is run that mat everywhere but only heat the parts that you want.
Ditra heat mat is about 1 4 inch thick.
Uncoupling waterproofing vapor management and support to ensure a long lasting installation.
Leaving other conventional systems out in the cold schlüter ditra heat is the perfect all in one integrated solution for use under tiles and natural stone flooring.
Areas of application over any even and structurally sound osb or.
Prior to installing ditra matting it is important the substrates are even load bearing clean and compatible prior to installing ditra matting.
Ditra matting is particularly useful when installing underfloor heating and provides a decoupling layer between the underfloor heating and the tiles.
Schluter ditra and ditra xl are specifically designed for ceramic and stone tile installations ditra and ditra xl provide uncoupling to prevent cracked tile and grout.
Where a waterproof floor is required all ditra heat and ditra heat tb seams and floor wall transitions must be sealed with kerdi band using unmodified thin set mortar.
Ditra matting is particularly useful when installing underfloor heating and provides a decoupling layer between the underfloor heating and the tiles.
Floor warming ditra heat combines the flexibility of loose heating cables with the ease of installation of mat systems.
Schlüter ditra heat has been developed offering unique electrical underfloor heating within the uncoupling matting layer system that eradicates sticky situations measuring mistakes and self levelling and primer layers.
Vapor barrier on crawl space floors according to regional building codes.
Schluter ditra heat integrates customizable comfortable electric floor warming with the functions associated with ditra.
Ditra matting can be used on a wide range of surfaces including concrete mortar screeds gypsum based screeds radiant heated screeds and masonry mixed substrates.
Alternatively you could use ditra heat mat only where you want to heat but i would recommend another similar height tile underlayment to use with it.