Insulation under the floor slab - Is it sensible? Experiences

  • Erstellt am 2019-05-07 17:18:30

Bauherr am L

2019-10-14 12:02:20
  • #1
That sounds interesting. Did you also take measures with the masonry? With sand-lime bricks, there are thermal insulation blocks that could be used for the bottom row of bricks... What about your other insulation? ETICS? How does the insulation run at the connection between wall and floor slab?
 

pffreestyler

2019-10-14 13:31:54
  • #2
We have Ytong. I would have to check the Lambda value they have in the calculation, but it will not be an exceptionally good value since it was built only according to the Energy Saving Ordinance.

We have a base slab with an 80 cm frost skirt and 10 cm perimeter insulation in the basement area (Knabe brick) then on the base slab 17.5 cm Ytong, 18 cm mineral wool, 2 cm air layer, and 11.5 cm facing bricks.

I don't know exactly what that is, since we did not use a KfW loan. It's something between the Energy Saving Ordinance and KFW 55.



 

Stadtvilla19

2020-02-02 13:57:59
  • #3
Our architect also said that insulation under the concrete slab is nonsense. Firstly, the insulation is applied on the slab, and secondly, the temperature of the soil under the house regulates itself. Whether inside in winter or summer, there are about 15 degrees in the soil directly beneath the slab. But everyone will probably have a different opinion on that.
 

Bookstar

2020-02-02 16:29:09
  • #4
Is actually nonsense and costs money. We did it because of [KFW]. But it doesn't bring you a single euro in savings or anything else.
 

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