Hello everyone,
We are currently planning our single-family home in the Stuttgart area. Apart from the exterior wall, most details are already decided. The house will be built in a quiet residential area with underfloor heating and gas.
I have received three options:
1. 17.5 cm (7 inches) brick + external thermal insulation composite system (ETICS) (standard wall) with no extra cost.
2. Ytong 36.5 cm (14 inches) block – if I may call it that – with a thermal transmittance of 0.23 W/m²K – additional cost: €8,900.
3. Poroton with 0.19 W/m²K – additional cost: €12,200.
I don’t really want to insulate my house with expanded polystyrene (EPS). I’m not a fan of that. Now I’m hesitating between options 2 and 3. What would you recommend?
Thank you very much.
We are currently planning our single-family home in the Stuttgart area. Apart from the exterior wall, most details are already decided. The house will be built in a quiet residential area with underfloor heating and gas.
I have received three options:
1. 17.5 cm (7 inches) brick + external thermal insulation composite system (ETICS) (standard wall) with no extra cost.
2. Ytong 36.5 cm (14 inches) block – if I may call it that – with a thermal transmittance of 0.23 W/m²K – additional cost: €8,900.
3. Poroton with 0.19 W/m²K – additional cost: €12,200.
I don’t really want to insulate my house with expanded polystyrene (EPS). I’m not a fan of that. Now I’m hesitating between options 2 and 3. What would you recommend?
Thank you very much.
Thank you. No, we do not need to meet any efficiency standards (not financed by KfW / no official regulations). We simply want reasonable insulation with a good cost-benefit ratio.
For sound insulation --> interior walls in the attic made of sand-lime brick.
We do not want a mechanical ventilation system with heat recovery (we do not like it).
A few questions about thermal insulation in the following:
What should I pay attention to regarding windows? Currently, triple-glazed clear glass windows made of meranti wood (white on both inside and outside / muntins sealed onto the glass / simple frame profile / aluminum drip caps) are planned for all floors except the basement. Basement windows will be PVC. All windows on the ground floor and attic will be equipped with electrically operated aluminum shutters.
Roof terrace: reinforced concrete slab with welded tapered insulation (Evalon) (according to the thermal protection calculation).
Attic: "membrane and insulation according to thermal protection calculation"...
Good luck
For sound insulation --> interior walls in the attic made of sand-lime brick.
We do not want a mechanical ventilation system with heat recovery (we do not like it).
A few questions about thermal insulation in the following:
What should I pay attention to regarding windows? Currently, triple-glazed clear glass windows made of meranti wood (white on both inside and outside / muntins sealed onto the glass / simple frame profile / aluminum drip caps) are planned for all floors except the basement. Basement windows will be PVC. All windows on the ground floor and attic will be equipped with electrically operated aluminum shutters.
Roof terrace: reinforced concrete slab with welded tapered insulation (Evalon) (according to the thermal protection calculation).
Attic: "membrane and insulation according to thermal protection calculation"...
Good luck
Ok, so the interior walls in the attic are made of sand-lime brick – but what about the interior walls on the ground floor/basement? Although this doesn’t directly relate to insulation, it is important for soundproofing and also practical considerations like mounting cupboards, shelves, TVs, and so on.
When it comes to windows and insulation, people often advertise an impressive U-value of around 0.5 (W/m²K). However, this is usually the Ug-value, which only refers to the glass itself, not the entire window. A good frame is essential for these values to really make sense.
In any case, triple glazing is always a safe choice. What matters more is that the calculations are done properly and that what was specified is actually installed. Otherwise, the sources of error tend to lie in the installation details, which can only be ensured by meticulous supervision from the site manager. The same applies to the roof terrace and the roof.
Good luck
K1300S
When it comes to windows and insulation, people often advertise an impressive U-value of around 0.5 (W/m²K). However, this is usually the Ug-value, which only refers to the glass itself, not the entire window. A good frame is essential for these values to really make sense.
In any case, triple glazing is always a safe choice. What matters more is that the calculations are done properly and that what was specified is actually installed. Otherwise, the sources of error tend to lie in the installation details, which can only be ensured by meticulous supervision from the site manager. The same applies to the roof terrace and the roof.
Good luck
K1300S
I have a question related to this topic, as I often see 17.5cm (7 inches) masonry plus insulation mentioned in the scope of work descriptions from companies in our region. As a non-expert, 17.5cm (7 inches) seems quite thin to me, and I would assume that load-bearing capacity and sound insulation might not be optimal. With the same insulation, one could also use 24cm (9.5 inches) masonry. What do you think is the minimum thickness the masonry should have? Or do you consider 17.5cm (7 inches) unproblematic? What factors determine how this should be evaluated?
1. Construction companies will build you a house that won’t collapse.
2. 17.5 cm (7 inches) calcium silicate brick masonry is standard/common. We have used it as well. It offers good sound insulation, and with brick veneer/ETICS (external thermal insulation composite system), it is also well insulated.
Of course, there are other ways to build, for example, with a thick solid wall without insulation (monolithic). The type of stone can also vary.
2. 17.5 cm (7 inches) calcium silicate brick masonry is standard/common. We have used it as well. It offers good sound insulation, and with brick veneer/ETICS (external thermal insulation composite system), it is also well insulated.
Of course, there are other ways to build, for example, with a thick solid wall without insulation (monolithic). The type of stone can also vary.
1. Understood...
2. However, sand-lime brick is not offered as a standard option.
I wonder if it is used frequently in construction or if it is included in the scope of work as the most economical wall structure, making the initial offer appear affordable, while most homeowners then choose a thicker wall construction for an additional cost.
2. However, sand-lime brick is not offered as a standard option.
I wonder if it is used frequently in construction or if it is included in the scope of work as the most economical wall structure, making the initial offer appear affordable, while most homeowners then choose a thicker wall construction for an additional cost.
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