Hello everyone,
We are currently planning the construction of a solid brick house (urban villa with 160 sqm (1722 sq ft)), with two full floors plus a basement, without KfW funding. The standard option with the general contractor includes 36.5 cm (14 inches) porous S9 bricks without integrated insulation (Lambda value 0.09) with a two-layer plaster, no external thermal insulation composite system (ETICS) => U-value 0.23 W/(m²K).
Now we have the option to choose TV7 bricks (Lambda value 0.07) with integrated insulation instead, for an additional cost of nearly 5000 euros => U-value 0.23 W/(m²K).
Is this additional cost worth it?
It is also not yet decided whether to install a ventilation system with heat recovery (additional cost 7000 euros). Our concern here is not the comfort it provides but really the efficiency and cost-benefit factor. Is a ventilation system really necessary to avoid moisture problems? I am not asking about the comfort of ventilating three times a day, but rather whether anyone has experienced mold issues in a relatively new house due to the absence of a ventilation system, especially if windows were only opened once or twice occasionally.
Thank you in advance for your information and opinions.
We are currently planning the construction of a solid brick house (urban villa with 160 sqm (1722 sq ft)), with two full floors plus a basement, without KfW funding. The standard option with the general contractor includes 36.5 cm (14 inches) porous S9 bricks without integrated insulation (Lambda value 0.09) with a two-layer plaster, no external thermal insulation composite system (ETICS) => U-value 0.23 W/(m²K).
Now we have the option to choose TV7 bricks (Lambda value 0.07) with integrated insulation instead, for an additional cost of nearly 5000 euros => U-value 0.23 W/(m²K).
Is this additional cost worth it?
It is also not yet decided whether to install a ventilation system with heat recovery (additional cost 7000 euros). Our concern here is not the comfort it provides but really the efficiency and cost-benefit factor. Is a ventilation system really necessary to avoid moisture problems? I am not asking about the comfort of ventilating three times a day, but rather whether anyone has experienced mold issues in a relatively new house due to the absence of a ventilation system, especially if windows were only opened once or twice occasionally.
Thank you in advance for your information and opinions.
Petey01 schrieb:
An additional cost of nearly 5000 euros for TV7 bricks (Lambda value 0.07) with integrated insulation instead => U-value 0.23 W/(m2K). Typo, it should of course say => U-value of 0.18 W/(m2K)
Lumpi_LE schrieb:
What goal do you want to achieve with the T7? What other goals are there besides better insulation? I would expect to have lower heating costs as a result.
Lumpi_LE schrieb:
Before you get mold problems from poor ventilation, other problems already occur. What would those be?
Petey01 schrieb:
The standard for the general contractor (GC) is 36.5cm (14 inches) porous S9 bricks without integrated insulation (lambda value 0.09) with two-layer plaster, no external thermal insulation composite system (ETICS) => U-value 0.23 W/(m²K). Then take that one. Black, no sugar. Always with that nonsense about left-rotating soy milk. The twin turbo isn’t worth it if you only drive in the city.
I don’t understand why laypeople, once they become future homeowners, believe the magic must lie behind some fifth decimal place in the product description. Even the brick makers are just using water to mix.
Lumpi_LE schrieb:
Without more information, the question is like asking: "Is a red car worth it?" Sort of. My car is worth it — but I’ll change the color the next time I trade it in, because that’s exactly the part that’s not worth it.
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