ᐅ House from 1960 – Exterior Wall Insulation – Energy Performance Rating G
Created on: 31 Jan 2022 22:14
L
leschafHello everyone,
I have a quick question: today we looked at a house built in 1960. In 2018, drainage was installed around about 75% of the house (except around the terrace), and it appears that the basement was also insulated from the outside during this work. Additionally, the facade was insulated in 2005 (it’s unclear with what exactly, but it looks quite thick, around 15cm (6 inches)). The heating system is a gas boiler from 1991, and the windows are double-glazed with plastic on the inside and wood on the outside. Ceiling height is 2.50m (8 feet 2 inches).
Now, the house’s energy certificate shows an energy demand of 200 kWh/m² — that seems very high given the insulation. The real estate agent said, “the facade insulation was done quite some time ago,” and “the heating system is simply old.” Is it possible that an old heating system combined with newer building materials can still result in an energy demand close to that of an uninsulated house? A few weeks ago, we saw another house with no insulation at all and an oil heating system from 2003, which showed about 160 kWh/m². I would guess there is still room for improvement through better roof and window insulation — but what else?
I also noticed that there was an instantaneous water heater in the kitchen downstairs, for example. I didn’t pay much attention to the bathroom because we would replace anything like that anyway.
I have a quick question: today we looked at a house built in 1960. In 2018, drainage was installed around about 75% of the house (except around the terrace), and it appears that the basement was also insulated from the outside during this work. Additionally, the facade was insulated in 2005 (it’s unclear with what exactly, but it looks quite thick, around 15cm (6 inches)). The heating system is a gas boiler from 1991, and the windows are double-glazed with plastic on the inside and wood on the outside. Ceiling height is 2.50m (8 feet 2 inches).
Now, the house’s energy certificate shows an energy demand of 200 kWh/m² — that seems very high given the insulation. The real estate agent said, “the facade insulation was done quite some time ago,” and “the heating system is simply old.” Is it possible that an old heating system combined with newer building materials can still result in an energy demand close to that of an uninsulated house? A few weeks ago, we saw another house with no insulation at all and an oil heating system from 2003, which showed about 160 kWh/m². I would guess there is still room for improvement through better roof and window insulation — but what else?
I also noticed that there was an instantaneous water heater in the kitchen downstairs, for example. I didn’t pay much attention to the bathroom because we would replace anything like that anyway.
Well... there can be many causes:
- Lack of roof insulation
- Heating all rooms including the basement to 25°C (77°F), windows always tilted open
- Heating during summer
- No condensing boiler
- House from the 1960s: Maybe there is still a gravity heating system installed! That was the case in my home before renovation. It even heated the uninsulated attic.
- Lack of roof insulation
- Heating all rooms including the basement to 25°C (77°F), windows always tilted open
- Heating during summer
- No condensing boiler
- House from the 1960s: Maybe there is still a gravity heating system installed! That was the case in my home before renovation. It even heated the uninsulated attic.
Heating makes a significant difference.
When comparing to other houses, it also depends on the specific building materials used. Our 1930 house consumes 150 kWh/m²/year, with minimal roof insulation from 1990. However, we do have solid, very thick exterior walls. Therefore, comparisons are always difficult...
When comparing to other houses, it also depends on the specific building materials used. Our 1930 house consumes 150 kWh/m²/year, with minimal roof insulation from 1990. However, we do have solid, very thick exterior walls. Therefore, comparisons are always difficult...
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