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
Bauexperte8 Jun 2014 09:09Good morning,
I recommend you read more in the forum; then you will better understand €uro´s comments, and many of your questions will also be answered by other users’ threads.
Regards, Bauexperte
Vega82 schrieb:So is it just the price at the bottom right that looks attractive?
We have now received a basically quite good offer from a company, which, to our surprise, builds with 30cm (12 inches) Ytong blocks.
Vega82 schrieb:36.5cm (14 inches) for good reason; though almost any other unfilled 36.5cm (14 inches) block can be used.
All other providers we have dealt with so far use 36.5cm (14 inches) Ytong blocks.
Vega82 schrieb:Meeting the Energy Saving Ordinance is not achieved by the chosen block alone but can be reached with almost any block if combined properly. The question is which KFW standard you want to achieve and which funding programs you want to apply for.
The Energy Saving Ordinance will probably be fulfilled with this, but I don’t really feel comfortable with it.
Vega82 schrieb:I hope you are not actually expecting to save on heating energy costs just by installing a controlled mechanical ventilation system?
We plan to install an air-source heat pump and a mechanical ventilation system (which is a requirement), and I have some concerns that the energy savings from those will be lost again due to the thin walls.
I recommend you read more in the forum; then you will better understand €uro´s comments, and many of your questions will also be answered by other users’ threads.
Regards, Bauexperte
My concern here is purely about the thermal insulation of the exterior wall; I fully understand that there are other factors involved.
I thought this was clear from my post.
This is a very reputable provider, which is supported by several points so far.
My focus is solely on the U-value. It likely won’t come down to 450 € (about 490 USD), but it would be interesting to know to what extent a U-value of 0.02 actually pays off.
The energy saving regulations certainly take many aspects into account, but the exterior wall has to meet the requirements as well. I was somewhat surprised that this standard can be maintained, since most providers now offer significantly better exterior walls as standard.
The ventilation and exhaust system is, as described, a requirement.
We do not plan to use KfW subsidies.
PS: The search function does not allow such short search queries.
I thought this was clear from my post.
This is a very reputable provider, which is supported by several points so far.
My focus is solely on the U-value. It likely won’t come down to 450 € (about 490 USD), but it would be interesting to know to what extent a U-value of 0.02 actually pays off.
The energy saving regulations certainly take many aspects into account, but the exterior wall has to meet the requirements as well. I was somewhat surprised that this standard can be maintained, since most providers now offer significantly better exterior walls as standard.
The ventilation and exhaust system is, as described, a requirement.
We do not plan to use KfW subsidies.
PS: The search function does not allow such short search queries.
Vega82 schrieb:
My point here is purely about the thermal insulation of the exterior wall; I am fully aware that there are other factors involved... Additional thermal insulation always reduces heating energy demand!However, the actual or expected consumption largely depends on the efficiency of the building services systems.
As an expert, I also work extensively with renovation projects, where the expected savings from insulation are often only partially or inconsistently realized. This leads to considerable disappointment among investors!
In many cases, this is not due to insufficient insulating properties of the building material itself. The main reason is usually that the building services systems are completely overlooked! Sustainable insulation measures generally require some degree of adjustment to the building services systems. This is often omitted or unknown by insulation material sellers due to their lack of technical training.
Even with new construction, proper planning and sizing of the building services systems are essential!
If you want to gain/receive X amount of money, you first have to invest some euros! You can’t get something for nothing!
Best regards,
Similar topics