Hello,
We are planning to build an urban villa. According to the building description, it will be constructed with 17.5 cm (7 inches) calcium silicate bricks and a 14 cm (5.5 inches) external thermal insulation composite system (ETICS), with a hipped roof at a 22-degree pitch.
The ceiling height should be 2.5 m (8.2 ft) for the 138 m² (1,487 ft²) living area.
The heating system specified in the building description is a Vaillant AuroCompact with a stratified storage tank (150 liters (40 gallons)), underfloor heating on both floors with individual room controls, and 2 solar panels (each 2.51 m² (27 ft²)).
We have now inquired about the additional cost if we want to upgrade to a KfW 70 energy standard house.
The following offer was made to us:
Increase insulation thickness from 14 to 16 cm (5.5 to 6.3 inches), install an air-to-air heat pump heating system (manufacturer not yet specified), and upgrade windows to triple glazing (currently Veka with double glazing, Ug 1.0). The price is €12,500. Is this justified? I find it a bit high, especially considering that the gas connection costs have already been offset in the calculation.
Unfortunately, I don’t know the heating load.
Regards,
Kay
We are planning to build an urban villa. According to the building description, it will be constructed with 17.5 cm (7 inches) calcium silicate bricks and a 14 cm (5.5 inches) external thermal insulation composite system (ETICS), with a hipped roof at a 22-degree pitch.
The ceiling height should be 2.5 m (8.2 ft) for the 138 m² (1,487 ft²) living area.
The heating system specified in the building description is a Vaillant AuroCompact with a stratified storage tank (150 liters (40 gallons)), underfloor heating on both floors with individual room controls, and 2 solar panels (each 2.51 m² (27 ft²)).
We have now inquired about the additional cost if we want to upgrade to a KfW 70 energy standard house.
The following offer was made to us:
Increase insulation thickness from 14 to 16 cm (5.5 to 6.3 inches), install an air-to-air heat pump heating system (manufacturer not yet specified), and upgrade windows to triple glazing (currently Veka with double glazing, Ug 1.0). The price is €12,500. Is this justified? I find it a bit high, especially considering that the gas connection costs have already been offset in the calculation.
Unfortunately, I don’t know the heating load.
Regards,
Kay
B
Bauexperte1 Dec 2013 20:44Nutshell schrieb:
Is it even clear what aerated concrete is? I think here Poroton (which can be filled with polystyrene beads, etc.) is being confused with aerated concrete Maybe you should take a look at my profile once 😉 Best regards, BauexperteB
Bauexperte1 Dec 2013 20:54Good evening,
I already mentioned that. If your supplier says it works, they should provide you with written proof… no loopholes.
Regards, Bauexperte
Nutshell schrieb:Then that is not sufficient – just my humble opinion. There are both organic and mineral fillers.
But still, aerated concrete blocks are not filled with anything ;-)
Nutshell schrieb:You can use the informal form with me :-)
What do you think is missing to achieve KFW55? We also do not want any polystyrene on the wall, especially since, according to my "supplier," it is not necessary to reach the target.
I already mentioned that. If your supplier says it works, they should provide you with written proof… no loopholes.
Regards, Bauexperte
B
Bauexperte1 Dec 2013 21:40Hello,
Regards, Bauexperte
Nutshell schrieb:Then please share – if you wish – which additional measures were taken … at your expense or that of your supplier.
It is all documented in writing, after all, a KfW55 house was sold! 😉
Regards, Bauexperte
Bauexperte schrieb:
Hello,
Then please share – if you want to – which additional measures have been taken… at your cost or that of your supplier.
Regards, BauexperteWhy do you assume that something needs to be changed in order to achieve that?B
Bauexperte1 Dec 2013 21:55Hello,
Regards, Bauexperte
Nutshell schrieb:17 years of continuous learning 😉
Why do you assume that something needs to be changed to achieve that?
Regards, Bauexperte