Hello,
As mentioned in the title, we are building with Ytong to achieve KfW55 standard.
Now our construction company has offered to build with 36.5 cm (14 inches) Ytong blocks instead of 24 cm (9.5 inches) Ytong plus 12 cm (5 inches) of full thermal insulation.
Advantages according to the construction company:
1. All values for KfW55 are met just the same.
2. Fastenings on the exterior wall, e.g. satellite dish, awning, etc., would be much easier to install because it’s solid masonry directly, without soft insulation.
3. Our site manager considers the insulation a sort of "hazardous waste" from his point of view, as its production and disposal are quite energy-intensive...
Disadvantages: none?? Price-wise it would make no difference for us.
What do you think?
Especially point 2 appeals to me...
Point 3 is just a personal opinion and therefore secondary for now.
Thanks and best regards to everyone!
As mentioned in the title, we are building with Ytong to achieve KfW55 standard.
Now our construction company has offered to build with 36.5 cm (14 inches) Ytong blocks instead of 24 cm (9.5 inches) Ytong plus 12 cm (5 inches) of full thermal insulation.
Advantages according to the construction company:
1. All values for KfW55 are met just the same.
2. Fastenings on the exterior wall, e.g. satellite dish, awning, etc., would be much easier to install because it’s solid masonry directly, without soft insulation.
3. Our site manager considers the insulation a sort of "hazardous waste" from his point of view, as its production and disposal are quite energy-intensive...
Disadvantages: none?? Price-wise it would make no difference for us.
What do you think?
Especially point 2 appeals to me...
Point 3 is just a personal opinion and therefore secondary for now.
Thanks and best regards to everyone!
Soundproofing, people!! In a residential area with a 30 km/h (20 mph) speed limit, I sleep deeply and peacefully in my steep-wall tent. Ytong blocks are more than sufficient for that. The thermal insulation advantage of a Styrofoam exterior will realistically save at most 20 euros per year. So, no contest.
And you get a solid wall that won’t get punctured if a ladder falls against it and is suitable for mounting fixtures. That’s not even a question.
And you get a solid wall that won’t get punctured if a ladder falls against it and is suitable for mounting fixtures. That’s not even a question.
Especially since the sound insulation does not come from the polystyrene – it actually worsens it by about 2 dB.
The sound insulation comes from the sand-lime brick – this is not really up for discussion here. So why accept the disadvantages of the external thermal insulation composite system (ETICS) without gaining any of its benefits...?
The sound insulation comes from the sand-lime brick – this is not really up for discussion here. So why accept the disadvantages of the external thermal insulation composite system (ETICS) without gaining any of its benefits...?
I cannot verify the U-values posted recently, at least not those for the monolithic construction. I had already shared these earlier, and the difference is clearly more significant.
The issue with wall plugs is vastly overrated. On the exterior, you will need only a handful of fixings for lights, a satellite mast once in a lifetime, and perhaps an awning. Yes, for external thermal insulation composite systems (ETICS / EIFS), special wall plugs and/or mounting boxes are required. But what about wall plugs inside? For aerated concrete blocks, definitely not standard wall plugs, and inside, you need many more wall plugs just for kitchen installation.
The myth about dents in ETICS walls comes only from those who equate ETICS with yogurt cups and polystyrene used for transport protection. Ouch. That is extremely painful to read, not helpful at all, but simply ridiculous. Just try running your fingernail over an aerated concrete block ... that argument is just as silly as the flying bikes that could destroy everything. That’s what I meant at the beginning about practical relevance.
The main disadvantage of aerated concrete is sound insulation compared to other building materials. Here, ETICS combined with calcium silicate bricks (sand-lime bricks) have the advantage. You have to consider whether you want to take that risk, as walls are difficult to replace later. But in a 30 km/h (19 mph) zone in a small area, it should not be overestimated. Furthermore, aerated concrete absorbs water, but it is not alone in this. Also, the monolithic construction brings disadvantages regarding thermal bridges and the related problems for the building fabric. This can be a problem but doesn’t have to be (just as not every ETICS is prone to algae growth or falls apart after 20 years).
The issue with wall plugs is vastly overrated. On the exterior, you will need only a handful of fixings for lights, a satellite mast once in a lifetime, and perhaps an awning. Yes, for external thermal insulation composite systems (ETICS / EIFS), special wall plugs and/or mounting boxes are required. But what about wall plugs inside? For aerated concrete blocks, definitely not standard wall plugs, and inside, you need many more wall plugs just for kitchen installation.
The myth about dents in ETICS walls comes only from those who equate ETICS with yogurt cups and polystyrene used for transport protection. Ouch. That is extremely painful to read, not helpful at all, but simply ridiculous. Just try running your fingernail over an aerated concrete block ... that argument is just as silly as the flying bikes that could destroy everything. That’s what I meant at the beginning about practical relevance.
The main disadvantage of aerated concrete is sound insulation compared to other building materials. Here, ETICS combined with calcium silicate bricks (sand-lime bricks) have the advantage. You have to consider whether you want to take that risk, as walls are difficult to replace later. But in a 30 km/h (19 mph) zone in a small area, it should not be overestimated. Furthermore, aerated concrete absorbs water, but it is not alone in this. Also, the monolithic construction brings disadvantages regarding thermal bridges and the related problems for the building fabric. This can be a problem but doesn’t have to be (just as not every ETICS is prone to algae growth or falls apart after 20 years).
Alex85 schrieb:
The myth about the WDVS (external thermal insulation composite system) wall getting dented only comes from those who compare WDVS to yogurt cups and polystyrene used for transport protection. Ouch. That’s extremely painful to read and not helpful at all—in fact, it’s simply nonsensical.
Try running your fingernail over an aerated concrete block... That argument is just as smart as the flying bicycles that could supposedly destroy everything. This is what I meant at the start about practical relevance. But then there are the woodpeckers that have become pure WDVS eaters and have now destroyed 97% of the world’s polystyrene reserves.
Tego12 schrieb:
Woodpeckers, which [...] have by now destroyed 97% of the worldwide polystyrene reserves.Oh, those are outdated figures; now it's 101% *LOL*
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