The schluter ditra heat duo membrane is 5 16 8 mm thick compared to ditra heat at 1 4 5 5 mm thick and has 4 benefits.
Ditra heated floors over concrete.
The integrated thermal break directs more heat up into the tile rather than down into the subfloor resulting in tiled floors that warm up to 70 faster over concrete substrates during heat up times.
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The ditra heat duo has fleece liner that results in a 70 faster floor warming response time.
Yet this application does make sense since concrete is heavy solid and is typically thought of as an unbending uncompromising material.
Ditra over concrete floors warning.
Over concrete substrates ditra heat duo is ideal due to its integrated bonding fleece which provides a thermal break as well as sound control.
The best part is that it solved my issue of heat loss through the cold concrete floor.
Installing tile directly on concrete.