Hello everyone,
We are finally back in the planning phase. A plot of land has been reserved.
We want to build a country house of about 180 m² (1,940 sq ft).
We are really just at the very beginning when it comes to the wall construction.
The first suggestion was 17.5 cm (7 inches) Poroton blocks plus insulation.
I think this is the cheapest construction method.
From what I have read so far, this might not be the best way to build.
What wall construction do you have and why?
What KfW standard have you achieved with it?
How satisfied are you with it?
I am also interested in experiences with walls insulated using styrofoam.
Thanks, Xinette
We are finally back in the planning phase. A plot of land has been reserved.
We want to build a country house of about 180 m² (1,940 sq ft).
We are really just at the very beginning when it comes to the wall construction.
The first suggestion was 17.5 cm (7 inches) Poroton blocks plus insulation.
I think this is the cheapest construction method.
From what I have read so far, this might not be the best way to build.
What wall construction do you have and why?
What KfW standard have you achieved with it?
How satisfied are you with it?
I am also interested in experiences with walls insulated using styrofoam.
Thanks, Xinette
DerBjoern schrieb:
... 17.5 Poroton + e.g. 16cm EPS requires about 50cm Poroton to achieve the same U-value. ... Not to forget the sometimes low floor area ratio: on a plot of 650m² (7,000 sq ft) with a floor area ratio of 0.2, you are allowed to build 130m² (1,400 sq ft) of floor area.
This can be barely enough for a bungalow ... if you can gain a few square meters of living space by using thinner walls, you would choose the ETICS version (or timber frame construction).
D
DerBjoern28 Oct 2014 12:05That's true, timber frame construction also achieves very good insulation values with thin wall thickness!
B
Bauexperte29 Oct 2014 11:04Hello,
With these values, we are no longer talking about "built to KfW 70" standards but well below KfW 55; especially since the T7 blocks are filled. However, this cannot be determined absolutely, as other factors also come into play.
I assumed a standard KfW 70; in this case, the perforated brick (thermal conductivity 0.09 W/mK) is not filled. When deciding between a narrower block plus external thermal insulation composite system (ETICS / external wall insulation) or a monolithic wall construction, the price differences are marginal.
From my practical experience, I see it differently.
Best regards, Bauexperte
DerBjoern schrieb:
17.5cm (7 inches) Poroton T7 + 16cm (6 inches) EPS with a thermal conductivity of 0.035 W/mK => U-value: 0.138 W/m²K
49cm (19 inches) Poroton T7 => U-value: 0.14 W/m²K
With these values, we are no longer talking about "built to KfW 70" standards but well below KfW 55; especially since the T7 blocks are filled. However, this cannot be determined absolutely, as other factors also come into play.
I assumed a standard KfW 70; in this case, the perforated brick (thermal conductivity 0.09 W/mK) is not filled. When deciding between a narrower block plus external thermal insulation composite system (ETICS / external wall insulation) or a monolithic wall construction, the price differences are marginal.
DerBjoern schrieb:
Not necessarily. A monolithic wall is also plastered separately. For an ETICS, the painter doesn’t need much more time. What the painter takes longer on the ETICS is saved in bricklaying time. The difference in effort has little impact on the scaffolding rental period.
From my practical experience, I see it differently.
Best regards, Bauexperte
Kurpfälzer7 Apr 2015 09:41I am currently very interested in this topic as well!
We plan to build a house this year. To qualify for funding through the favorable loan, we aim to meet KfW 70 standards.
I have read a lot by now, but I find myself reaching the limits of my understanding when I see the many different values for thermal conductivity and lambda values.
Could someone tell me which exterior wall insulation/thickness with ETICS (polystyrene) and 17.5cm (7 inches) calcium silicate brick is necessary to easily meet the requirements?
Thank you in advance.
We plan to build a house this year. To qualify for funding through the favorable loan, we aim to meet KfW 70 standards.
I have read a lot by now, but I find myself reaching the limits of my understanding when I see the many different values for thermal conductivity and lambda values.
Could someone tell me which exterior wall insulation/thickness with ETICS (polystyrene) and 17.5cm (7 inches) calcium silicate brick is necessary to easily meet the requirements?
Thank you in advance.
D
DerBjoern7 Apr 2015 10:15You cannot simply say that, as the overall package of the house must be right. There are no direct requirements for a single component, such as the wall.
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