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.
B
boxandroof23 May 2019 12:51Wall material is overrated.
Indoors, I would choose KSS, but not at an additional cost. It always depends on the overall construction: sound insulation of the utility shafts, windows and installation quality, roller shutter boxes, doors, and the structure of the exterior wall.
Indoors, I would choose KSS, but not at an additional cost. It always depends on the overall construction: sound insulation of the utility shafts, windows and installation quality, roller shutter boxes, doors, and the structure of the exterior wall.
Nordlys schrieb:
We live in a Ytong house.And Kaya shops at Edeka. By the way, I belong to a different faith, as they say in Cologne.Regarding the type of stone, I wouldn’t get too worked up—it’s not like any of them are disasters or magic solutions. Calcium silicate blocks for interior walls would also be my first choice, but that doesn’t mean other materials are a problem. Thermal bridges are not linked to any specific material; everything can be installed incorrectly.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Nordlys schrieb:
Hollow? The 3DF has a handle hole, otherwise solid. Weighs about 7kg (15 lbs). The smaller one weighs 5kg (11 lbs) or 4kg (9 lbs), it has no hole, it’s a brick. Yes, hollow.
Regarding #23:
That also makes it easier...
(Mechanical ventilation with heat recovery for the attic)