ᐅ KfW55 with 36 cm brick wall – feasible or not?

Created on: 11 Jul 2016 15:24

Hello.

We are planning a single-family house together with an architect, aiming for KfW55 standard. According to the architect, using 36.5 cm (14.4 inches) bricks should not be a problem. With these dimensions, everything is now also approved for the building permit / planning permission.
The structural engineer is now skeptical, and the energy consultant said this wouldn’t be possible at all.

So basically the question is: Has anyone successfully done this before?

Also to be installed: air-to-water heat pump, controlled ventilation with heat recovery.

Thank you.

tabtab17 Jul 2016 12:20

#19

That does not matter. T8 / T9 insulation, whether filled or unfilled, always has the same U-value. Only the sound insulation value changes.

bluminger30 Jul 2016 15:16

#20

It will now also be possible for us with KfW55 and 36cm (14 inch) masonry walls.
Ground floor and attic walls require a thermal conductivity of λ=0.07 – likely filled brick or aerated concrete.
Window U-value 0.9.
Roof insulation must be a total of 32cm (13 inches).

MoeGT18 Aug 2016 17:40

#21

What do you think, is it possible to achieve KfW55 standard with a gas heating system just by adding insulation and installing a controlled ventilation system?

Goldi0911118 Aug 2016 20:41

#22

I don't think so, and the additional investment will not be proportional to the "better" conditions, at least with the current interest rates.

Climbee18 Aug 2016 21:30

#23

I was told that the KfW55 standard can only be achieved using renewable energy sources. If you use gas, you are automatically disqualified.
My information.

Goldi0911118 Aug 2016 21:42

#24

Yes, the "nonsensical" panels on the roof are necessary.

ᐅ KfW55 with 36 cm brick wall – feasible or not?

Reaktionen