Hello everyone!
We have chosen a Flair 124 ZD from Town & Country. The plan was a 24 cm (9.5 inches) wall made of aerated concrete plan blocks with plaster applied directly onto the blocks. The builder recommends using a 30 cm (12 inches) wall made of the same material instead. Does that make sense, or is it just a way to charge more?
We have chosen a Flair 124 ZD from Town & Country. The plan was a 24 cm (9.5 inches) wall made of aerated concrete plan blocks with plaster applied directly onto the blocks. The builder recommends using a 30 cm (12 inches) wall made of the same material instead. Does that make sense, or is it just a way to charge more?
Guestgiver schrieb:
After some research, it also seems to me that 36.5 cm (14 inches) is the actual standard and that 24 cm (9.5 inches) is quite thin? You didn’t really need to dig up this thread, as the topic is still actively discussed here: for example in https://www.hausbau-forum.de/threads/monolithische-Bauweise.25481/ and https://www.hausbau-forum.de/threads/in-2017-kein-kfw-70-kfw-55-kfw-40-40-plus-nur-noch-Standard-und-e55.25577/ (not claiming completeness).
“Standard” has been 36.5 cm (14 inches) since around 1980, before that it was 30 cm (12 inches); no minimum wall thickness is legally required, but rather a maximum thermal transmittance value (U-value) — at least until now. With today's energy-saving regulations, the situation is somewhat different; they focus on a mix of heat transfer through walls and other building elements, energy saving and generation methods, and so on. This means you can adjust factors such as the type of heating system, the size of window areas, etc. Wall thickness as a means of controlling the overall energy balance has become a less important factor.
Walls of 24 cm (9.5 inches) thickness — made from whatever masonry — without additional insulation are definitely outdated. Recently, I think I read here on the forum about a trick where some home builders include walls based on the 2014 energy-saving regulations in their construction descriptions and use that to make their prices look better, even though complying with the 2016 energy-saving regulations—which are required to obtain a building permit/planning permission—is offered only as an extra cost package. But this is nothing new; cheapness and reliability have always been mutually exclusive, just as in the days of Wilhelm II, and probably long before the “ancient Greeks.”
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