ᐅ Single-Wall Masonry vs. Cavity Wall with External Thermal Insulation Composite System (ETICS)
Created on: 3 Jul 2011 22:01
W
Wallace
I am planning to build a KfW70 semi-detached house with an air-source heat pump.
I can choose between the following two options:
- 36.5 cm (14.4 inches) masonry made of aerated concrete or Poroton brick
- 17.5 cm (6.9 inches) Ytong / hollow brick plus 10–12 cm (4–5 inches) external insulation system
What do you see as the advantages and disadvantages? The necessary insulation should be achieved with both systems. An energy demand calculation will be done beforehand, and KfW70 certification is guaranteed.
I think the second option has the advantage of thinner walls (7–9 cm (3–4 inches) more interior space), no risk of water freezing within the masonry (>0°C (32°F)), the masonry is exposed to smaller temperature fluctuations and is therefore better protected against deformation and cracks, and better sound insulation due to the external insulation system.
Disadvantages: the external insulation system is less resistant to mechanical stress.
Advantages of the 36.5 cm (14.4 inches) masonry: faster construction, greater thermal mass/volume resulting in a more comfortable indoor climate (temperature and humidity).
These are some assumptions I have made. What about the costs?
I can choose between the following two options:
- 36.5 cm (14.4 inches) masonry made of aerated concrete or Poroton brick
- 17.5 cm (6.9 inches) Ytong / hollow brick plus 10–12 cm (4–5 inches) external insulation system
What do you see as the advantages and disadvantages? The necessary insulation should be achieved with both systems. An energy demand calculation will be done beforehand, and KfW70 certification is guaranteed.
I think the second option has the advantage of thinner walls (7–9 cm (3–4 inches) more interior space), no risk of water freezing within the masonry (>0°C (32°F)), the masonry is exposed to smaller temperature fluctuations and is therefore better protected against deformation and cracks, and better sound insulation due to the external insulation system.
Disadvantages: the external insulation system is less resistant to mechanical stress.
Advantages of the 36.5 cm (14.4 inches) masonry: faster construction, greater thermal mass/volume resulting in a more comfortable indoor climate (temperature and humidity).
These are some assumptions I have made. What about the costs?
Häuslebauer40 schrieb:
...Most general contractors are tough negotiators when it comes to pricing and rarely concede, even when confronted with their often excessive, in my opinion, profit margins. A smart builder therefore strengthens their position rather than weakens it, preferably by choosing local general contractors or general subcontractors!Best regards
H
Häuslebauer407 Sep 2012 19:21€uro schrieb:
A smart builder upgrades rather than cuts back, especially when working with local general contractors!
Best regards.Correct. I also built with a local contractor. Still, the negotiations were tough.