Hello everyone,
Recently, the topic of the concrete slab came up.
One builder said:
The insulation layer goes on top of the concrete slab.
Why? Because then you don't have to effectively heat the slab unnecessarily.
Another builder argued:
Include the concrete slab within the insulation, so the slab is protected from the outside as well.
What are your thoughts on this?
I hope my question is clear 🙂
Recently, the topic of the concrete slab came up.
One builder said:
The insulation layer goes on top of the concrete slab.
Why? Because then you don't have to effectively heat the slab unnecessarily.
Another builder argued:
Include the concrete slab within the insulation, so the slab is protected from the outside as well.
What are your thoughts on this?
I hope my question is clear 🙂
As far as I know, there is also 10-15cm (4-6 inches) of insulation planned under the concrete slab, followed by the "standard" insulation on the slab for underfloor heating or, yes, below the screed. The basement is also insulated from the outside, so the overall construction works again.
B
Bieber081515 Jan 2018 13:58As far as I know, a slab-on-ground with insulation underneath is still the exception (to my knowledge, the required insulation boards are somewhat more expensive).
Insulating below reduces thermal bridges. When the slab is insulated on top, the (interior) walls create thermal bridges (which can be minimized using a special cove stone).
For underfloor heating systems, i.e., heated screeds, there should be insulation between the heated screed and the slab in both cases (as is also done with intermediate floors).
I find the reasons cited in #1 insufficient. They seem rather weak, if not outright incorrect, statements.
Insulating below reduces thermal bridges. When the slab is insulated on top, the (interior) walls create thermal bridges (which can be minimized using a special cove stone).
For underfloor heating systems, i.e., heated screeds, there should be insulation between the heated screed and the slab in both cases (as is also done with intermediate floors).
I find the reasons cited in #1 insufficient. They seem rather weak, if not outright incorrect, statements.
Joedreck schrieb:
I would probably follow the way the contractor always builds. Because that’s what they are good at Without having a specific opinion on this question, I would generally recommend this approach: whenever there is reasonable doubt that two construction methods are equivalent, choose the one the builder knows inside out. Differences between system X and system Y are often marginal, whereas the factor “defect-free execution” (which becomes much more likely with experience) is a major advantage. In the worst case, the builder might misunderstand and use a material or installation method that is correct (unfortunately) only for X, but then applied to Y.
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