New construction flat roof with gas heating according to the Energy Saving Ordinance 2016

Hello,

since the construction of our new flat-roof house is imminent, we wanted to ask you for advice on which materials (aerated concrete, Poroton bricks filled/unfilled, sand-lime brick.. you would build with / which wall thicknesses / whether with or without ETICS) and why?

We want to heat with natural gas, which will make the matter more expensive.

Sound insulation from outside is not necessary, as we are building at the edge of the forest / outskirts of town at a dead-end street, at most soundproofing inside the house due to children/night shifts, etc.

We only want to achieve the minimum value of the Energy Saving Ordinance 2016 (no KfW funding), building as cost-effectively as possible, as narrow as possible, the latter probably conflicting?

The double garage attached to the house should also be built solidly, which materials there?

Many thanks in advance!

I always respond the same way, as you can read using the search function in any thread about this singer dispute:

Find a suitable builder and then have them build it the way they do best. No stone is the devil, and there is no philosopher's stone either. The reversed approach (deciding on the stone first and then looking for the processor) puts the cart before the horse, and specifying stone X and demanding it from the contractor—knowing that they are much more experienced with stone Y—increases the risk of botched building part connections.

In terms of wall thickness, it is almost a zero-sum game whether you build 36.5 cm monolithic or 24 cm stone + 12 cm insulation or 17.5 cm stone + 16 cm insulation.

A garage is a functional building; its walls support the roof, climate is secondary there.

Every general contractor and every architect has their favorite construction method... And honestly: most of the time the overall package including price decides... no one asks about advantages or disadvantages. People gladly accept the construction method of the general contractor or architect if everything else fits. We have [WDVS]... otherwise we would probably build monolithically without this insulation if the price had not been higher.