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!
K
Knallkörper7 Mar 2017 09:09tempic schrieb:
An external thermal insulation composite system (ETICS) is unfortunately more complex and expensive ...... than a double-layer wall with cavity insulation? Hmm
So, I’m back again… and hopefully you could pick up some information between the lines.
Why do we have the choice between 24cm (9.5 inches) Ytong + 12cm (5 inches) insulation or “just” 36.5cm (14.5 inches) Ytong?
The simple answer is: The standard allows choosing the insulation package… and in the discussion afterwards, we could decide (which we haven’t done yet).
Regarding the wall thickness: according to my calculations, it stays roughly the same +/- a centimeter (inch).
Sound insulation: Good question… it’s true that Ytong isn’t the best choice here, but we will be living in a residential area with a 30 km/h (20 mph) zone, and it’s on a ring road with about 20 houses and only one access road located at the other end… Furthermore, we are basically in the countryside.
So the question is how good the soundproofing really needs to be? I probably can’t answer that…
My builder only works with Ytong, so I just assume they know what they’re doing.
If I summarize for myself:
Disadvantages: Sound insulation
Advantages: Easier to mount objects. Insulation performance is equally good compared to 12cm (5 inches) of additional insulation.
Why do we have the choice between 24cm (9.5 inches) Ytong + 12cm (5 inches) insulation or “just” 36.5cm (14.5 inches) Ytong?
The simple answer is: The standard allows choosing the insulation package… and in the discussion afterwards, we could decide (which we haven’t done yet).
Regarding the wall thickness: according to my calculations, it stays roughly the same +/- a centimeter (inch).
Sound insulation: Good question… it’s true that Ytong isn’t the best choice here, but we will be living in a residential area with a 30 km/h (20 mph) zone, and it’s on a ring road with about 20 houses and only one access road located at the other end… Furthermore, we are basically in the countryside.
So the question is how good the soundproofing really needs to be? I probably can’t answer that…
My builder only works with Ytong, so I just assume they know what they’re doing.
If I summarize for myself:
Disadvantages: Sound insulation
Advantages: Easier to mount objects. Insulation performance is equally good compared to 12cm (5 inches) of additional insulation.
and I also have this statement:
With this, already 36.5 cm (14 inches) thick, single-shell wall constructions meet the energy standard of a KFW Efficiency House 55. Furthermore, the design block is thus already aligned today with the energy saving regulation standards applicable from 2020.
With this, already 36.5 cm (14 inches) thick, single-shell wall constructions meet the energy standard of a KFW Efficiency House 55. Furthermore, the design block is thus already aligned today with the energy saving regulation standards applicable from 2020.
Just enter the wall structure on u-wert.net. Then you have the comparison. I get a better U-value there with 24cm (9.5 inches) Ytong and 12cm (4.7 inches) insulation. Wasn't the statement that both wall constructions are sufficient for KfW 55 and not that they have equally good insulation?
Yes – that was exactly the main point. What does better mean? Do you have these values?
Sorry, I’m not a construction expert.
The site manager said that FW55 could be achieved with both... but what I’ve already understood is that KfW is initially a calculated value and only indirectly represents the heating demand. Is that correct?
Sorry, I’m not a construction expert.
The site manager said that FW55 could be achieved with both... but what I’ve already understood is that KfW is initially a calculated value and only indirectly represents the heating demand. Is that correct?
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