ᐅ Exterior wall, interior insulation, followed by slate installation in new construction
Created on: 6 Mar 2011 10:25
F
Franka
Hello! Sorry if I’m bringing up a topic that has probably been discussed many times before. However, we have an additional issue: the later installation of slate cladding on the gables and the required substructure for it.
Background:
We are in the process of having a 150 sqm (1,615 sq ft) solid house built. It is intended to be a "standard house" that complies with the 2009 energy-saving regulation guidelines. It will be equipped with a gas condensing boiler combined with a solar system and underfloor heating. The house will have a white plastered finish; the gables are to be clad with slate.
Our builder has proposed exterior walls of 17.5 cm (7 inches) aerated concrete blocks ("Ytong") on the ground floor and upper floor. In addition, the interior walls on the ground floor will be made of 17.5 cm (7 inches) thick lime sand brick masonry as plan blocks. The interior walls in the upper floor will be built with 11.5 cm (4.5 inches) aerated concrete blocks. The facade is to receive a 140 mm (5.5 inches) external thermal insulation composite system (ETICS).
The slate facade cladding will also require an elaborate and costly thermal insulation system.
Now my question:
Is it possible to use a thicker exterior wall (for example 24 cm or 30 cm / 9.5 inches or 12 inches) with less insulation? Can the slate cladding be installed on counter battens with minimal insulation in between? Or could the upper floor perhaps be constructed with a timber frame system to avoid multiple layers of insulation and substructures?
We are complete beginners and would appreciate your suggestions and experiences.
Background:
We are in the process of having a 150 sqm (1,615 sq ft) solid house built. It is intended to be a "standard house" that complies with the 2009 energy-saving regulation guidelines. It will be equipped with a gas condensing boiler combined with a solar system and underfloor heating. The house will have a white plastered finish; the gables are to be clad with slate.
Our builder has proposed exterior walls of 17.5 cm (7 inches) aerated concrete blocks ("Ytong") on the ground floor and upper floor. In addition, the interior walls on the ground floor will be made of 17.5 cm (7 inches) thick lime sand brick masonry as plan blocks. The interior walls in the upper floor will be built with 11.5 cm (4.5 inches) aerated concrete blocks. The facade is to receive a 140 mm (5.5 inches) external thermal insulation composite system (ETICS).
The slate facade cladding will also require an elaborate and costly thermal insulation system.
Now my question:
Is it possible to use a thicker exterior wall (for example 24 cm or 30 cm / 9.5 inches or 12 inches) with less insulation? Can the slate cladding be installed on counter battens with minimal insulation in between? Or could the upper floor perhaps be constructed with a timber frame system to avoid multiple layers of insulation and substructures?
We are complete beginners and would appreciate your suggestions and experiences.
E.Curb schrieb:
definitely do not add insulation afterward, because it’s not necessary!Sorry, but as a layperson looking at the wall structure described by the original poster—17.5cm (7 inches) aerated concrete block plus 14cm (5.5 inches) external thermal insulation composite system (ETICS)—I don’t have to be a clairvoyant to know that this building probably won’t even meet the KfW 70 energy standard and will be completely outdated in terms of energy efficiency in 15–20 years!
AND now please tell me, what can you do afterward with such a facade?
No offense intended, but if someone wants to build cheaply and “backwards,” they should at least try to achieve a monolithic wall construction to have a chance of adding insulation later with relatively low effort—am I completely off here?
I’m happy to be convinced otherwise, since I’m just a layperson who has absolutely no professional involvement with construction and is only trying to think logically.
So please don’t take offense
B
Bauexperte7 Mar 2011 19:03Hello,
exactly ... and you don’t need plastic or elastomers for that
Kind regards
E.Curb schrieb:
By the way: a U-value ≤ 0.16 W/m²K is not magic
exactly ... and you don’t need plastic or elastomers for that
Kind regards
B
Bauexperte7 Mar 2011 19:13Hello,
Well, look at that—you might want to work on your sentence construction; it read quite differently before.
By the way—a small remark—why don’t you actually build houses yourself? Are you afraid of your own courage?
Still, best regards
€uro schrieb:
Anyone living in a "plastic shell" just had the wrong advisor/planner!
Well, look at that—you might want to work on your sentence construction; it read quite differently before.
€uro schrieb:
There’s no need to discredit anyone; in the end, numbers and facts are what matter.
By the way—a small remark—why don’t you actually build houses yourself? Are you afraid of your own courage?
Still, best regards
blurboy schrieb:
Sorry, but as a layperson looking at the wall construction the original poster describes—17.5 cm (7 inches) aerated concrete block plus 14 cm (5.5 inches) external thermal insulation composite system—I don’t need to be a clairvoyant to know this building probably won’t even meet KFW 70 standards and will be energetically outdated in 15 to 20 years!
So please tell me, what do you do later on with such a façade? And that is exactly why it must be planned with foresight. A 17.5 cm (7 inches) backup wall plus 14 cm (5.5 inches) insulation is clearly insufficient. I can only advise the original poster to invest a bit more money in the building envelope and save in other areas.
blurboy schrieb:
No offense, but if you want to build cheaply and “less advanced,” you should at least aim for a monolithic wall so you still have a chance to add insulation later with relatively little effort, or am I completely off here? Unfortunately, you are somewhat off there. It’s never cheaper than choosing the right construction from the start when building new. Adding insulation afterward is also more challenging from a construction standpoint. I’m thinking about thermal bridges and how the façade insulation connects to the roof insulation, for example. Of course, it can all be done later, but it costs a small fortune.
blurboy schrieb:
So no hard feelings [/QUOTE]
Why would I be mad at you???
Regards
Bauexperte schrieb:
Exactly ... and for that, no plastic or elastomers are needed
The plastic cover thing came from you
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