dertill
2023-12-21 09:40:43
- #1
Offer of a barn built in 1960, which was converted into a residential building in 2013 (230m² living space, 380m² usable space on which the energy certificate is based). Consumption was about 18,000 kW in the last 3 years, probably so low due to the well-insulated roof.
18,000 kWh of what? Gas?
How many m² are actually heated? Even with 230m² living space (times 1.2 equals the energy reference area on the energy certificate), that would correspond to a final energy demand of 65 kWh/m². Quite low, even with a good roof. If the conversion to living space was carried out in 2013, there were also corresponding Energy Saving Ordinance 2009 or 2013 (depending on the date of the change-of-use application/building application) requirements for the minimum quality of the building envelope.
A solid brick wall of almost 40 cm would not have met this. Is there monument protection? If yes, that would be a reason why the wall was left as is – on the other hand, also a reason not to insulate it from the outside now.
I suspect the intended building is in an outer area? (Barns usually are)
Completely different rules apply there (building authority!), you should definitely ask beforehand what is permitted.
Regarding the installation of ETICS or similar or the installation of outdoor units of heat pumps, the location in the outer area has no influence. Both are allowed as long as property boundaries, distances, and TA noise (heat pump) are observed.
The sandstone is only visible on one wall inside, the rest has something over it (white inside, yellow outside).
Is the sandstone visible and unrendered inside? Outside too?
Visible raw structure of an exterior wall inside means it drafts like crazy.
In general, with visible sandstone without exterior render outside, if at all, I would opt for internal insulation. But first clarify the rest.