ᐅ Sand-lime brick versus pumice for masonry?

Created on: 2 Oct 2019 13:57
B
Bauherr am L
Hello everyone,

Our architects and the structural engineer have specified calcium silicate blocks for the exterior and load-bearing interior walls.

Now we have received a shell construction quote using pumice blocks (according to structural requirements).

Therefore, I would like to discuss the topic of calcium silicate blocks versus pumice blocks with you. What are the advantages and disadvantages of each type of block from your point of view? Who has experience?

Just to clarify: an external thermal insulation composite system (ETICS) will be applied to the masonry.

Thank you very much!
J
Joedreck
12 Oct 2019 09:56
Then I would choose sand-lime brick. Just a matter of personal preference.
T
Tego12
12 Oct 2019 13:28
With only a 2% difference, I would also choose sand-lime brick plus EIFS (external insulation and finish system). In my opinion, it has almost exclusively advantages compared to aerated concrete.
11ant12 Oct 2019 14:21
Tego12 schrieb:

In my opinion, it has almost only advantages compared to aerated concrete.
Pumice is not aerated concrete at all, but I already mentioned that. However, I think the difference here is mostly a matter of personal preference, so I wouldn’t consider calcium silicate brick inferior – but it isn’t the same either.
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B
Bauherr am L
12 Oct 2019 16:16
Tego12 schrieb:

With only a 2% difference, I would also choose sand-lime brick plus external thermal insulation composite system (ETICS). In my opinion, it has almost only advantages compared to aerated concrete.

Both options would be masonry plus ETICS. It really comes down to the wall material itself. 20cm (8 inches) pumice or 20cm (8 inches) sand-lime brick. According to the shell builder: they only differ in color, and plasterers prefer pumice because it requires less extensive priming.
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guckuck2
12 Oct 2019 18:06
Let's check if the sand-lime brick with a thickness of 17.5cm (7 inches) is sufficient, possibly with a higher thermal insulation value.

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