ᐅ Construction method: 36.5 cm aerated concrete or 17.5 cm masonry with 14 cm external insulation (ETICS/EWI)
Created on: 1 Apr 2017 11:50
M
MaJessHello,
we are currently deciding on a construction company. Our main question right now is how we should build our house. We have one offer with a 36.5 cm (14 inch) aerated concrete wall with plaster, and another offer with a 17.5 cm (7 inch) aerated concrete wall plus 14 cm (5.5 inch) external thermal insulation composite system (ETICS) using mineral textured plaster as the top coat with a 2 mm (0.08 inch) grain size, and a base plaster with colored stone plaster as the top coat.
We are very inexperienced with building and do not know which option is better. The house will be built in a quiet village with no traffic noise. It is important for us that we do not have high heating costs, but that the walls can breathe and there is no risk of mold growth.
We appreciate any tips and advice.
The heating system in offer 1 would be gas plus solar, while offer 2 includes an air-to-water heat pump.
Best regards
we are currently deciding on a construction company. Our main question right now is how we should build our house. We have one offer with a 36.5 cm (14 inch) aerated concrete wall with plaster, and another offer with a 17.5 cm (7 inch) aerated concrete wall plus 14 cm (5.5 inch) external thermal insulation composite system (ETICS) using mineral textured plaster as the top coat with a 2 mm (0.08 inch) grain size, and a base plaster with colored stone plaster as the top coat.
We are very inexperienced with building and do not know which option is better. The house will be built in a quiet village with no traffic noise. It is important for us that we do not have high heating costs, but that the walls can breathe and there is no risk of mold growth.
We appreciate any tips and advice.
The heating system in offer 1 would be gas plus solar, while offer 2 includes an air-to-water heat pump.
Best regards
Your topic is a classic, see https://www.hausbau-forum.de/threads/Neubau-36-5-Porenbeton-dämmen.9364/ or https://www.hausbau-forum.de/threads/24er-Ytong-Dämmung-oder-Ytong-36-5er.18874/ (in the latter, I recently explained the ETICS in my view on page 10, post no. 60).
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https://www.linkedin.com/company/bauen-jetzt/
Mold becomes a problem when moisture collects in corners that are cooler than the surrounding areas and does not dry out. This has less to do with external thermal insulation composite systems (ETICS) than with the high airtightness of modern buildings. Closed means closed. Therefore, corners or window reveals are particularly vulnerable. Ventilation is important, or even better, mechanical ventilation. RegelAir is the most affordable option and imitates an old, not completely airtight window, which used to be healthy because of the slight drafts through the windows. When there is a northwest storm, the candle should flicker, but it no longer does behind triple-glazed units.
The disadvantage of ETICS facades is that the shaded north side, because the exterior render is always cooler than the interior, tends to become damp and often mossy. Aerated concrete plus render without expanded polystyrene insulation should, I emphasize should, be less prone to this. But is that true?
A real downside is the fragile surface. A thin layer of render, then expanded polystyrene insulation, then the masonry. And people often like to attach things to the exterior wall—mailboxes, hose holders, lights. This is much easier with a monolithic facade. My choice, since brick cladding was too expensive, was thick Ytong (aerated concrete) plus render without polystyrene, combined with mechanically ventilated windows, and no blower door test—I don’t want an airtight house. If I can’t afford the extra $50 for gas, I can’t afford the whole thing. That’s my opinion. Karsten
The disadvantage of ETICS facades is that the shaded north side, because the exterior render is always cooler than the interior, tends to become damp and often mossy. Aerated concrete plus render without expanded polystyrene insulation should, I emphasize should, be less prone to this. But is that true?
A real downside is the fragile surface. A thin layer of render, then expanded polystyrene insulation, then the masonry. And people often like to attach things to the exterior wall—mailboxes, hose holders, lights. This is much easier with a monolithic facade. My choice, since brick cladding was too expensive, was thick Ytong (aerated concrete) plus render without polystyrene, combined with mechanically ventilated windows, and no blower door test—I don’t want an airtight house. If I can’t afford the extra $50 for gas, I can’t afford the whole thing. That’s my opinion. Karsten
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