The images were produced by a recognised University and show that a cementitious screed is 20 to 30% more efficient as a thermal conductor than an anhydrite screed.
Cementitious screeds are more efficient due to their greater compaction and due to cement being an active conductor.
Anhydrite

FlexiDry Fibre Screed

FlexiDry Fibre Screed vs anhydrite

The comparison thermal image shows the heat generated by the UFH pipes. The heat transferred through the cementitious screed can be seem on the left. Whereas with the anhydrite screed, on the right, the heat from the UFH pipes is visible but the screed acts as an insulator rather than a conductor so the heat transfer through the screed is less.
3 D Thermal Images: FlexiDry Fibre Screed (left), Anhydrite Screed (right)


