ᐅ Window quotes as different as day and night

Zaba12 schrieb:
Please write some details about what exactly was so disastrous.

Dr Hix has already provided a pretty accurate list.

Additionally: sealing tape that had “OUTSIDE” printed in large letters on it was used on the inside, and it was said that this was correct. Also, the connecting strip in the kitchen was installed above the window due to a higher countertop (this has been corrected).

Dr Hix schrieb:
Support blocks were either completely forgotten or just cut from a loose roof batten (spruce/pine)

I thought the roof batten under our patio door was one of a kind.

Dr Hix schrieb:
As cute as I find the candle test (I can truly empathize with it!), it was still pointless. Airtightness is not about wind possibly blowing through here (the outer compression tape should prevent that), but rather about preventing warm indoor air from penetrating the structure at this point.

Hehe, thanks . So if that is mostly the concern, then everything is fine.

Problem:
The building still needs a 10cm (4 inches) external insulation layer to comply with the energy-saving regulations. This means the window reveals would also need to be insulated, with 5cm (2 inches) on each side. As a result, the windows would become 10cm (4 inches) narrower. However, the windows are already quite small, and natural light is limited in the building.
We would like to avoid losing even more light by making the windows smaller. Is it possible to first enlarge and cut out the window reveals and then install the insulation? Or are there particularly thin insulation materials available? Any advice?

Making it wider is not possible, otherwise the lintel won’t rest properly.
Reveal insulation or reveal panels are the key. In the reveals, just use 3cm (1¼ inches) Resol or Bauder boards, which have a thermal conductivity of WLG 025.

Additionally, insulation is applied on top of the frame, allowing for about 3cm (1¼ inches) there. Even with 5cm (2 inches) insulation, that means only 2cm (¾ inch) narrower per side.

However, for existing buildings, there is no obligation to insulate the façade unless it was not a residential building.

Our windows were set further outward. A frame was installed, and the windows were fitted within it.

kaho674 schrieb:
The mentioned building still needs a 10cm (4 inch) insulation on the exterior to comply with the energy saving regulation

Is that really the case?
For existing buildings, the obligation to apply the energy saving regulation to “modified” components does not apply, as long as the building as a whole does not exceed the permissible reference values by more than 40% at the end. (Energy Saving Regulation §9 paragraph 1)
This means you theoretically have the option to achieve the required values through other measures. A detailed thermal bridge calculation is often a good approach here. It only costs a fraction of what exterior insulation would, and on paper can produce the same result.

But even if that is not sufficient, the question remains whether the entire facade actually needs to be insulated. The “10% rule” (e.g. when repairing plaster) always applies to the specific component. So if the entire north facade gets new plaster and this affects more than 10% of all plaster areas on the building, the insulation obligation applies only to the north facade.

Another option would be an exemption under §25, which is often relatively easy to justify, especially given the facade and its high costs.

It would be a shame if the charm of an old industrial building were spoiled by an ETICS (external thermal insulation composite system).