Hello,
We were originally supposed to use a calcium sulfate screed (Maxit). According to the technical data sheet, it has a thermal conductivity of about 1.83 W/mK.
The construction company now wants to use a product from Hasit instead: Hasit cement sulfate screed. According to its data sheet, it has a thermal conductivity of about 1.4 W/mK.
Our contract specifies calcium sulfate screed. Should we insist on that since it has better thermal conductivity?
Thank you.
We were originally supposed to use a calcium sulfate screed (Maxit). According to the technical data sheet, it has a thermal conductivity of about 1.83 W/mK.
The construction company now wants to use a product from Hasit instead: Hasit cement sulfate screed. According to its data sheet, it has a thermal conductivity of about 1.4 W/mK.
Our contract specifies calcium sulfate screed. Should we insist on that since it has better thermal conductivity?
Thank you.
Tolentino schrieb:
Ah, is it because of the district heating?Yes, exactly.Tolentino schrieb:
Watch out for legionella. But of course, you might be allowed to set the storage temperature to 65°C (149°F).The hygienic storage tank is apparently set to 75°C (167°F).Allthewayup schrieb:
I now regret the 1,000 L (265 gallons) buffer tank.Why? The builder said that with the large tank, a small heat pump will run more efficiently later on because the temperature in the tank doesn’t drop as much when someone takes a bath (329 L (87 gallons) minus the homeowner)...A
Allthewayup25 Oct 2023 11:50However, you pay for this with losses. The heat pump can provide heat almost immediately on demand when needed, or it can repeatedly charge a buffer up to the target temperature that then releases the heat when required. If it is not needed, it is still present and loses energy through cooling.
Allthewayup schrieb:
It is also possible to leave out the area of the buffer tank when laying the screed. I just spoke with the construction company. The heating engineer is installing XPS instead of EPS under the buffer tank area. There will also be underfloor heating installed there. The screed will be done the same way as in the rest of the room. Impact sound isn’t a problem since it’s not connected to the wall. Is that correct?
Allthewayup schrieb:
However, you will pay for this with losses. So poor advice, unfortunate... Are these significant additional costs?
A
Allthewayup25 Oct 2023 20:09The actual additional costs mainly relate to purchasing components that could have been omitted or made smaller. During operation, you naturally won’t notice this since you have no point of comparison for how it could have been. It’s not possible to reliably quantify this. I learned during construction that sometimes it’s best not to overthink certain things, as you can’t know everything beforehand and therefore can’t adjust every detail.
Allthewayup schrieb:
The actual additional costs are primarily related to purchasing the components.I see.
Is using XPS under the screed also acceptable regarding impact sound? I believe they will install it tomorrow afternoon.
I really appreciate your input.
A
Allthewayup25 Oct 2023 21:34se_na_23 schrieb:
Oh, I see.
Is using XPS under the screed okay in terms of impact sound insulation? I think they will install it tomorrow afternoon?
I really appreciate your input Although XPS is not as sound-absorbing as EPS, it is acceptable—and allowed. We also use it like this in the utility room.
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