ᐅ How is the "typical wall thickness" determined for cavity walls?
Created on: 4 Nov 2021 19:48
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karl.jonas
Hello,
I have read a lot about possible wall constructions, and it seems there is no single “right” solution, which is fine. However, when I add up the commonly recommended layers (assuming it’s better to insulate more rather than less), I end up with a cavity wall consisting of Poroton blocks on the inside and clinker bricks on the outside measuring about 1 cm (0.4 inches) (plaster) + 30 cm (12 inches) (Poroton) + 18 cm (7 inches) (mineral wool insulation) + 4 cm (1.5 inches) (ventilation gap) + 12 cm (5 inches) (clinker) = 65 cm (26 inches). On the other hand, when I search for “typical wall thickness,” I usually find values around 49 cm (19 inches) or less (for a standard KFW55 or KFW40 house). Where am I mistaken?
Karl
I have read a lot about possible wall constructions, and it seems there is no single “right” solution, which is fine. However, when I add up the commonly recommended layers (assuming it’s better to insulate more rather than less), I end up with a cavity wall consisting of Poroton blocks on the inside and clinker bricks on the outside measuring about 1 cm (0.4 inches) (plaster) + 30 cm (12 inches) (Poroton) + 18 cm (7 inches) (mineral wool insulation) + 4 cm (1.5 inches) (ventilation gap) + 12 cm (5 inches) (clinker) = 65 cm (26 inches). On the other hand, when I search for “typical wall thickness,” I usually find values around 49 cm (19 inches) or less (for a standard KFW55 or KFW40 house). Where am I mistaken?
Karl
K
karl.jonas4 Nov 2021 23:03Thank you for the quick and clear responses, except from 11ant. I came across your websites through the "Steinemantra" and can now spend a few evenings reading again. It really helps when you want to understand later what the architect is telling you and why they suggest certain things.
Great forum here, and thanks again.
Karl
Great forum here, and thanks again.
Karl
Do I need to understand why you first explicitly exclude me from thanking everyone, and then in the same breath acknowledge that you found plenty of reading material on my page for several evenings?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
K
karl.jonas5 Nov 2021 08:13@11ant: Sorry and thank you for following up. My comment "Except for 11ant" was meant ironically. I’m very grateful for your contributions, not only here but also in many other parts of the forum. They are always very objective and informative. From my point of view, this also applies to your advice as a building guide. Forums like this thrive because of people like you, and beginners like me benefit greatly from it.
I hope I have clarified this now.
Karl
I hope I have clarified this now.
Karl
karl.jonas schrieb:
I am very grateful for your contributions, not only here but also in many other parts of the forum. They are always very factual and informative. From my perspective, this also applies to your guidance as a construction advisor. Forums like this thrive on people like you, and beginners like me benefit greatly from it. I’m glad to hear that, and it seems you are new here, but have actually been a silent reader for quite some time before? How long exactly?
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
H
HausTmMike5 Nov 2021 13:16If you use 17.5cm (7 inches) calcium silicate blocks + 20cm (8 inches) insulation + 2cm (1 inch) air gap, you end up with 51.5
Calcium silicate block was the best choice for a good indoor climate, right?
Benutzer200 schrieb:
Our last new build was, for example, 17.5cm (7 inches) calcium silicate block + 14cm (6 inches) insulation + 11.5cm (5 inches) facing brick. An air gap is not necessary.
Calcium silicate block was the best choice for a good indoor climate, right?