Hello,
We have now received a fundamentally good offer from a company that, to our surprise, uses 30 cm (12 inches) Ytong blocks for construction. All other providers we have dealt with so far use 36.5 cm (14.5 inches) Ytong blocks.
The house will probably meet the energy saving regulations with this, but I still do not feel entirely comfortable. We are planning a heat pump and a ventilation system with heat recovery (which is required), and I am somewhat concerned that the energy savings from these might be offset by the thinner walls.
We have now received a fundamentally good offer from a company that, to our surprise, uses 30 cm (12 inches) Ytong blocks for construction. All other providers we have dealt with so far use 36.5 cm (14.5 inches) Ytong blocks.
The house will probably meet the energy saving regulations with this, but I still do not feel entirely comfortable. We are planning a heat pump and a ventilation system with heat recovery (which is required), and I am somewhat concerned that the energy savings from these might be offset by the thinner walls.
B
BauProjekt146 Jun 2014 23:3030 cm (12 inches) aerated concrete is also sufficient for KfW 70. With 36.5 cm (14 inches), KfW 55 is achievable.
Vega82 schrieb:
Well, the brick has a U-value of 0.30
.... How do you know this, or the specific requirements of the particular building project? Are you aware of its required compressive strength based on the structural demands, and the resulting lambda value? Probably not!
Vega82 schrieb:
...What do you think? Apparently, as is often the case, this is an advice from people who are completely unqualified, otherwise you wouldn’t need anonymous, unreliable assistance. Best regards.
I’m not quite sure what you’re trying to say with that; it definitely doesn’t answer my questions.
I got the values for the bricks from the house construction company, as well as the alternative options to be used.
The question now is what cost/benefit ratio an “upgrade” would have.
I got the values for the bricks from the house construction company, as well as the alternative options to be used.
The question now is what cost/benefit ratio an “upgrade” would have.
B
BauProjekt148 Jun 2014 01:23Vega82 schrieb:
Hello,
We have now received a generally quite good offer from a company that, to our surprise, builds with a 30 cm (12 inch) Ytong block.
All other providers we have dealt with so far use a 36.5 cm (14 inch) Ytong block.
The energy saving regulation will probably be met with this house, but I’m not really comfortable with it. We are planning an air source heat pump and a ventilation system with heat recovery (which is mandatory), and I am somewhat concerned that the energy we save with these systems might be lost again due to the thinner walls. how old are you?
Vega82 schrieb:
..., it definitely does not answer my questions. Because they cannot be answered reliably. Besides winter thermal insulation, a building envelope must fulfill additional functions: load bearing, sound insulation, and summer thermal protection.
Vega82 schrieb:
...The question now is what cost/benefit ratio an "upgrade" would represent. The additional cost is defined by the supplier. If it is only about winter thermal insulation, the verifier can perform calculations with different U-values. Then, as a reference, compare the differences in final energy consumption, but not the absolute values. Hopefully, the 450 € will not exceed the budget; this should not actually be an issue.
Best regards.
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