ᐅ Sand-lime brick with external thermal insulation composite system (ETICS), aerated autoclaved concrete (AAC) blocks, or double-layered sand-lime brick construction
Created on: 10 Jun 2020 09:10
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bebymouzzz
Dear users,
I hope you can help us.
We want to build a rural house in Bavaria.
2 full floors + attic.
11 x 11.8 m (36 x 39 feet) floor area.
38° pitched roof.
2 residential units (possibly later).
A passive house standard is aimed for, according to the energy consultant.
Since our site manager retired, we need to find another company.
All timber houses have become more expensive; offers for the shell construction are mostly between about 287,000 and 350,000.
Now we have an offer from Ytong for 150,000, but Ytong causes us some concerns regarding sound insulation (2 loud children, etc.) and the fact that moisture is only released slowly, as well as difficulties with mounting fixtures.
We have now often heard that in our case, 24 cm (9.5 inches) calcium silicate blocks plus an external thermal insulation composite system (ETICS) would be cheaper than Ytong.
Do you possibly have some experience with this?
Or also calcium silicate block square meter prices including insulation, since the facade cost is missing from the Ytong offer.
Thank you very much.
I hope you can help us.
We want to build a rural house in Bavaria.
2 full floors + attic.
11 x 11.8 m (36 x 39 feet) floor area.
38° pitched roof.
2 residential units (possibly later).
A passive house standard is aimed for, according to the energy consultant.
Since our site manager retired, we need to find another company.
All timber houses have become more expensive; offers for the shell construction are mostly between about 287,000 and 350,000.
Now we have an offer from Ytong for 150,000, but Ytong causes us some concerns regarding sound insulation (2 loud children, etc.) and the fact that moisture is only released slowly, as well as difficulties with mounting fixtures.
We have now often heard that in our case, 24 cm (9.5 inches) calcium silicate blocks plus an external thermal insulation composite system (ETICS) would be cheaper than Ytong.
Do you possibly have some experience with this?
Or also calcium silicate block square meter prices including insulation, since the facade cost is missing from the Ytong offer.
Thank you very much.
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bebymouzzz11 Jun 2020 16:39tomtom79 schrieb:
Just because of the sound insulation, calcium silicate brick is my favorite choice for the next house. What are you currently using?
And how noticeable is the difference?
bebymouzzz schrieb:
Well, the Ytong contractor says that 24cm (9.5 inches) Ytong on the inside is more than enough to prevent hearing everything from the next room. That may be true, but who wants such thick interior walls? Sand-lime bricks can achieve this with 11.5cm (4.5 inches), or 17.5cm (7 inches) if load-bearing.
You also don’t need 24cm (9.5 inches) sand-lime bricks for exterior walls; the 17.5cm (7 inches) version should be sufficient there as well.
Make sure to include the space taken up by these thick walls in your calculations...
You didn’t save money by skipping a construction manager/planner, did you...?
bebymouzzz schrieb:
And the other guy is a Ytong partner (who also works with sand-lime bricks, mostly for commercial projects) who said the extra costs would be around €20,000. An extra €20,000 to build monolithically with Ytong? That would be reasonable. You save the external thermal insulation system (ETICS) for that. Ultimately, it’s a zero-sum game.
What makes Ytong and its variants so affordable is the labor cost. A Ytong house simply requires only a few hours of work. The thermal insulation is excellent; we live in such a house. You can build monolithically without external thermal insulation composite systems (ETICS / cladding), and mounting things like wall cabinets works well. However, the sound insulation is not very good. If you have some extra budget, adding a brick veneer on the outside improves the sound insulation as well. Many people here also build with Ytong on the outside for insulation, but use sand-lime brick inside the walls.
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bebymouzzz11 Jun 2020 17:58guckuck2 schrieb:
That may be true, but who wants such thick interior walls? Sand-lime brick is available at 11.5cm (4.5 inches), and load-bearing at 17.5cm (7 inches).
You also don’t need 24cm (9.5 inches) sand-lime brick for exterior walls; 17.5cm (7 inches) should be sufficient there as well.
Include the space loss caused by the thick walls in your calculations...
I guess you skipped on a construction manager/planner, right...?
20,000 more to build monolithically with Ytong? That would be okay. In return, you save on external thermal insulation composite systems (ETICS). In the end, it’s a zero-sum game. Well, regarding the interior walls, he said it’s possible but would cause structural issues.
We chose 24cm (9.5 inches) sand-lime brick because we need to run many cables inside (KNX).
Yes, we didn’t hire one; I often consult our building instructions at work (currently not possible due to a work accident).
He said that sand-lime brick would cost us 20,000 more than Ytong.
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bebymouzzz11 Jun 2020 18:05Nordlys schrieb:
What makes Ytong and its variants so affordable is the labor cost. A Ytong house simply requires fewer working hours. The thermal insulation is excellent; we live in such a house. You can build monolithically without external thermal insulation composite systems (ETICS / external wall insulation). Hanging wall cabinets, etc., works well, but the sound insulation is not as good. If you have some extra money, adding a brick veneer would improve the sound insulation. Many people here use Ytong for the exterior walls because of insulation, but use calcium silicate bricks for the interior walls. We have someone in the family who does ETICS (external thermal insulation), so for us, it would only cost materials and time (interior finishing will be done by ourselves).
Brick veneer is not allowed in our area; only plastered façades are permitted.
As mentioned above, according to the builder, calcium silicate bricks are not recommended for structural reasons, and Ytong would be comparable to calcium silicate bricks in terms of thickness.
Online, I have always seen prices for calcium silicate bricks at around €35 per m2 (approximately $38 per m2) plus €50 per m2 (about $54 per m2) for masonry labor, so the higher price for Ytong, which is said to cost for 169 m2 (about 1818 ft2) built, seems strange to me.
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