ᐅ New Construction – Is Insulation Worthwhile? Experiences?
Created on: 22 Jan 2023 15:03
H
Hausbau189
Good day, esteemed experts,
We are currently building our single-family house. It is being constructed using solid masonry (T9 unfilled 36.5), with a living area of approximately 290sqm (3120 sq ft) spread over three floors.
The roof will be insulated with about 24cm (9.5 inches) internally and 5cm (2 inches) externally.
We will heat the house using a geothermal heat pump (underfloor heating). Additionally, the house will be equipped with a controlled mechanical ventilation system. It should also be mentioned that we will have a fireplace (mainly for the ambiance). A photovoltaic system will be installed on the roof, potentially covering the entire surface area. The question now is whether it makes sense to additionally insulate the exterior walls (ETICS / external wall insulation system)?
We are not building to KfW standards…
Please do not be too harsh in your judgment ;-)
I could not find an answer to my question through the search function.
Our goal is to achieve good insulation in summer and, of course, to minimize heating costs.
Thank you for your kind exchange.
Best regards
We are currently building our single-family house. It is being constructed using solid masonry (T9 unfilled 36.5), with a living area of approximately 290sqm (3120 sq ft) spread over three floors.
The roof will be insulated with about 24cm (9.5 inches) internally and 5cm (2 inches) externally.
We will heat the house using a geothermal heat pump (underfloor heating). Additionally, the house will be equipped with a controlled mechanical ventilation system. It should also be mentioned that we will have a fireplace (mainly for the ambiance). A photovoltaic system will be installed on the roof, potentially covering the entire surface area. The question now is whether it makes sense to additionally insulate the exterior walls (ETICS / external wall insulation system)?
We are not building to KfW standards…
Please do not be too harsh in your judgment ;-)
I could not find an answer to my question through the search function.
Our goal is to achieve good insulation in summer and, of course, to minimize heating costs.
Thank you for your kind exchange.
Best regards
B
Bausparfuchs23 Jan 2023 21:31Feel free to ask your plasterer. They will probably try to convince you to use an External Thermal Insulation Composite System (ETICS). That way, they can charge five times the price of a simple lime-cement plaster and don’t have to carry as many bags.
I also installed the T9 with a thickness of 36.5 cm (14 inches). An excellent block. Applying a proper lime-cement plaster both inside and outside gives you roughly 40 cm (16 inches) wall thickness with healthy physical properties. Alternatively, a thermal insulation plaster (lightweight plaster) could be used.
You really don’t need more than that. Your house will remain largely breathable and moisture-regulating. You lose these qualities with ETICS.
And although today the polystyrene insulation is usually only glued with perimeter foam, the prices keep rising. Then there are all the rails, meshes, adhesives, anchors, and who knows what else. Totally excessive.
I wouldn’t do it.
I also installed the T9 with a thickness of 36.5 cm (14 inches). An excellent block. Applying a proper lime-cement plaster both inside and outside gives you roughly 40 cm (16 inches) wall thickness with healthy physical properties. Alternatively, a thermal insulation plaster (lightweight plaster) could be used.
You really don’t need more than that. Your house will remain largely breathable and moisture-regulating. You lose these qualities with ETICS.
And although today the polystyrene insulation is usually only glued with perimeter foam, the prices keep rising. Then there are all the rails, meshes, adhesives, anchors, and who knows what else. Totally excessive.
I wouldn’t do it.
Bausparfuchs schrieb:
That’s all you need. Your house remains largely breathable and moisture-regulating. You lose these properties with external thermal insulation composite systems (ETICS). Your house only has these properties in the marketing brochure. Sorry.
Bausparfuchs schrieb:
Then he can charge five times as much as for a simple lime-cement plaster and doesn’t have to carry so many bags. That’s also untrue and comes straight from fairy tales.
Insulation materials are becoming more expensive, yes, due to demand and also because of renovation work on existing buildings. In new construction, ETICS has already been the dominant wall assembly for years.
But be that as it may, adding ETICS onto a monolithic exterior wall in a new building under construction is not sensible.
guckuck2 schrieb:
In new construction, ETICS has been the dominant wall system for years.
Is that really the case? In our new development area, the houses all look like ours from the outside—at least those that are not yet plastered. From the outside, you mostly just see these Ytong blocks. I haven't seen any composite systems so far.
W
WilderSueden24 Jan 2023 08:27Not here either. Four times prefabricated houses, twice filled bricks, and once us with Ytong.
Dominantly, an ETICS is used in residential construction as well as offices, etc., with reinforced concrete walls.
Dominantly, an ETICS is used in residential construction as well as offices, etc., with reinforced concrete walls.
kati1337 schrieb:
Is that really the case? In our new development area, all the houses look the same from the outside. At least the ones that haven’t been plastered yet. You usually only see those Ytong blocks from the outside. I haven’t seen any composite systems so far.It is difficult to find reliable statistics on this. At Destatis, you can find information about the materials used, but terms like "brick" or "aerated concrete" don’t specify whether the construction is monolithic or not. For example, Town & Country typically build with aerated concrete plus an external thermal insulation composite system (ETICS) / external wall insulation (EWI). So statistics on this are quite challenging to collect.
W
WilderSueden24 Jan 2023 09:37Using aerated concrete with external thermal insulation composite systems (ETICS) doesn't really make sense. This combines the disadvantages of both methods and has only one advantage: aerated concrete can be easily cut to size.
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