ᐅ Cement-based or anhydrite screed in new construction with underfloor heating?
Created on: 19 Sep 2018 08:00
A
Almo85
Hello,
we are trying to decide between cement screed and the recently popular anhydrite screed.
We have an air-to-water heat pump combined with underfloor heating. There are varying opinions regarding cost, accuracy, and thermal conductivity. According to most sources, anhydrite screed transfers the heat from underfloor heating much more effectively. However, I saw the exact opposite in a YouTube video. What is correct?
[MEDIA=YouTube]CF4RO4PXcEI[/MEDIA]
Best regards,
Almo
we are trying to decide between cement screed and the recently popular anhydrite screed.
We have an air-to-water heat pump combined with underfloor heating. There are varying opinions regarding cost, accuracy, and thermal conductivity. According to most sources, anhydrite screed transfers the heat from underfloor heating much more effectively. However, I saw the exact opposite in a YouTube video. What is correct?
[MEDIA=YouTube]CF4RO4PXcEI[/MEDIA]
Best regards,
Almo
We have cement screed in the bathrooms and utility room (less sensitive to moisture) and anhydrite screed everywhere else (but not flowing anhydrite).
With cement screed, you also need more expansion joints, which is why it wouldn’t have been as nice in the living room, for example.
Other than that, I have no expertise in this area and simply left the decision to the professionals / the construction company.
With cement screed, you also need more expansion joints, which is why it wouldn’t have been as nice in the living room, for example.
Other than that, I have no expertise in this area and simply left the decision to the professionals / the construction company.
So, in the shared YouTube video, cement screed is apparently better, but general information suggests that anhydrite screed is preferable.
I am aware of the thermal inertia with underfloor heating and will try to manage it using the self-regulating effect to prevent the air source heat pump from switching on and off 30 times a day.
Does anyone know if anhydrite screed can also warp like sometimes happens with cement screed? I believe this is called “cupping”... when, during the drying process, the screed lifts at the edges, like a slice of bread drying out.
I am aware of the thermal inertia with underfloor heating and will try to manage it using the self-regulating effect to prevent the air source heat pump from switching on and off 30 times a day.
Does anyone know if anhydrite screed can also warp like sometimes happens with cement screed? I believe this is called “cupping”... when, during the drying process, the screed lifts at the edges, like a slice of bread drying out.