House 1960 - Facade insulation - Energy certificate G

  • Erstellt am 2022-01-31 22:14:43

leschaf

2022-01-31 22:14:43
  • #1
Hello everyone,

I just have a quick question: today we looked at a house (built 1960). In 2018, a drainage was installed around about 75% of the house (except around the terrace), and it looks like the basement was also insulated from the outside at that time. In addition, the facade was insulated in 2005 (unclear with what exactly, but it looks fairly thick (~15cm)). The heating system is a gas heating from 1991, windows are double glazed with plastic on the inside and wood on the outside. Ceiling height 2.50m.

Now the house has an energy demand of 200 kwh/m2 on the energy certificate – that seems very high to me for the insulation. The real estate agent said "the facade insulation has been there for quite some time" and "the heating is just old". Is it possible that an old heating system and newer building materials make that much of a difference, so that you basically have the energy demand of an uninsulated house? A few weeks ago we looked at another house, which was not insulated at all and had an oil heating from 2003 with 160 kwh/m2. I would estimate that you can still gain quite a bit from the roof and the windows – but otherwise?

I also noticed that in the kitchen downstairs there was, for example, an instantaneous water heater. I didn’t pay attention to the bathroom because we would throw something like that out anyway.
 

Tassimat

2022-02-01 02:15:45
  • #2
Well... that can have many causes:
- Missing insulation of the roof
- Heating all rooms including the basement to 25°, windows always tilted open
- Heating in summer
- No condensing boiler
- House from the 60s: maybe there is even a gravity heating system installed! I had that before the renovation as well. It was even used to heat the uninsulated attic.
 

SoL

2022-02-01 06:34:24
  • #3
Heating makes a big difference. As far as the comparison with other houses is concerned, it also depends on the house-specific materials. Our house from 1930 consumes 150kWh/m²/year, with minimal roof insulation from 1990. However, we also have massive, very thick exterior walls. Therefore, a comparison is always difficult...
 

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