ᐅ Is a screed necessary? Unfinished but insulated attic space
Created on: 3 Aug 2017 13:07
H
Holleradhiho
Hello community,
We are currently planning a semi-detached house with a developer and I need some advice on one question.
It’s about the attic, which is not living space and not heated, but will be used for storage.
The roof will be insulated with 240mm (9.4 inches) of mineral wool and OSB boards, and the floor consists of a 20mm (0.8 inches) concrete slab.
My question: Is it necessary to seal the floor with screed, or can this be omitted for a purely storage area? The costs seem relatively high, so I’m asking about the benefit.
According to the developer, the screed would of course contribute to thermal insulation; without screed, the upper floor would help heat the attic. But since I have insulated the roof, no heat should be lost.
Is it possible to estimate how many degrees the attic would heat up more without screed compared to with screed?
Is it really necessary to install screed, or would floor coverings be sufficient? I just want to store cabinets and boxes there.
Thank you very much for your help and support,
Best regards
Holleradhiho
We are currently planning a semi-detached house with a developer and I need some advice on one question.
It’s about the attic, which is not living space and not heated, but will be used for storage.
The roof will be insulated with 240mm (9.4 inches) of mineral wool and OSB boards, and the floor consists of a 20mm (0.8 inches) concrete slab.
My question: Is it necessary to seal the floor with screed, or can this be omitted for a purely storage area? The costs seem relatively high, so I’m asking about the benefit.
According to the developer, the screed would of course contribute to thermal insulation; without screed, the upper floor would help heat the attic. But since I have insulated the roof, no heat should be lost.
Is it possible to estimate how many degrees the attic would heat up more without screed compared to with screed?
Is it really necessary to install screed, or would floor coverings be sufficient? I just want to store cabinets and boxes there.
Thank you very much for your help and support,
Best regards
Holleradhiho
I had an unfinished basement floor for over 20 years, as well as several unfinished garage floors. I am also familiar with attic storage rooms with tongue-and-groove boards. Why would you need a screed in these cases? I consider its "insulating effect" to be negligible.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
H
Holleradhiho3 Aug 2017 14:33@basti: Yes, exactly like that.
Does that mean the attic heats up excessively? No opening (window) is planned.
How much is "a lot of heat"?
Does this construction method affect the KfW rating?
Does that mean the attic heats up excessively? No opening (window) is planned.
How much is "a lot of heat"?
Does this construction method affect the KfW rating?
Is it really only a 20mm (0.8 inch) concrete slab or 20cm (8 inches)?
When I searched for "concrete slab insulation value," I found some information... One site mentions a U-value of 1.1 for a 20cm (8 inches) thick concrete slab with 4-5cm (1.5-2 inches) of screed... that would be roughly equivalent to double-glazed window insulation... but again, that's for 20cm plus 5cm (2 inches) of screed.
But as I said, others in the forum can probably provide more detailed information...
When I searched for "concrete slab insulation value," I found some information... One site mentions a U-value of 1.1 for a 20cm (8 inches) thick concrete slab with 4-5cm (1.5-2 inches) of screed... that would be roughly equivalent to double-glazed window insulation... but again, that's for 20cm plus 5cm (2 inches) of screed.
But as I said, others in the forum can probably provide more detailed information...
Basti2709 schrieb:
there is, among other things, a site that states a U-value of 1.1 with 20cm (8 inches) concrete thickness and 4-5cm (1.5-2 inches) screed... that would be roughly equivalent to double glazing... That should be about right. Screed is denser than concrete. It doesn’t primarily provide insulation—that’s not its purpose, nor is it designed for that. It doesn’t make a significant difference. It certainly cannot compensate for insulation being installed in the wrong place—while better than nothing, the ceiling would have been a more suitable location. The change screed provides is so minuscule that it doesn’t justify considering. The mistake was made elsewhere and cannot be corrected by this (and even mitigating it would be so minimal as to be pointless).
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Similar topics