ᐅ Assessment of Quotation Price for Insulation Under the Slab/Foundation

Thermal insulation certification and structural engineering calculations are not required for the building permit in our case. However, they must be submitted before construction begins.

Here in NRW it’s the same.

But it doesn’t make sense to request a shell construction if there are no specifications for insulation thickness. The order is wrong. It sounds like an amateur is trying to play the architect here.

We plan and manage the trades ourselves.
What do you mean by wrong sequence? I choose a general contractor, and then the contractor’s designer/structural engineer prepares the submission plan/energy performance certificate/fire protection, etc.
If I have a house built with Schlagmann T8 bricks and a concrete ceiling, then the general contractor will know from experience what type of insulation needs to be installed at least under the foundation slab.

You are talking about the shell construction, now it’s a building contractor who is also supposed to provide design services. In the next sentence, you say you will manage the trades yourself....

Again, good luck. ;-)
You will need it.

This gives a rough estimate of what needs to go beneath the foundation slab. However, nowadays, the thermal insulation certificate involves more than just U-value 0.28 W/m²K (T8) plus the foundation slab—it follows the energy-saving regulations. It’s not about evaluating individual parts alone but assessing the house as a whole, including heating type, windows, ventilation, and so on.

I’m already familiar with the procedure. The master mason handles the initial design submission, and the rest is done independently. This used to be standard practice here, but as the trades have become increasingly interconnected, this approach has become more difficult.

and1986 schrieb:
We plan and manage the trades ourselves.
What do you mean by wrong sequence? I choose a general contractor, and then the contractor’s planner/structural engineer prepares the submission plans/thermal insulation certificate/fire protection, etc.
If I’m having a house built with Schlagmann T8 bricks and a concrete slab, the contractor will know from experience the minimum insulation required under the slab.

What about your architect or draftsman? They should determine everything in an integrated way.

With the current approach, it won’t work.