ᐅ Single-Wall Masonry vs. Cavity Wall with External Thermal Insulation Composite System (ETICS)
Created on: 3 Jul 2011 22:01
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WallaceI 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?
Hello,
It is important, of course, that the exterior wall you choose also fits the overall building (heating system and other exterior components). All elements must be coordinated with each other.
Regarding the choice of building materials, I would like to suggest calcium silicate bricks.
Best regards
It is important, of course, that the exterior wall you choose also fits the overall building (heating system and other exterior components). All elements must be coordinated with each other.
Regarding the choice of building materials, I would like to suggest calcium silicate bricks.
Best regards
B
Bauexperte4 Jul 2011 09:34Hello,
More like 10 cm (4 inches), but you also add 10 cm (4 inches) external insulation in front of the masonry and the prospect—if the tightening of the energy savings regulations continues in the coming years—of having to dispose of this system as hazardous waste at high cost before you can implement further energy-saving measures. If you choose the 36.5 cm (14 inches) aerated concrete, you avoid these possible costs because you can add additional insulation materials without demolition work.
And—because E.Curb brought it up—the aerated concrete tolerates the material combination, here calcium silicate for the interior walls, better than hollow bricks.
Kind regards
Wallace schrieb:
I want to have a KfW70 semi-detached house built with an air heat pump. I can choose between two options:
- 36.5 cm (14 inches) masonry made of aerated concrete or Poroton bricks
- 17.5 cm (7 inches) Ytong / hollow brick and 10 - 12 cm (4 - 5 inches) external insulation system
I think with the second option I have the advantage that the wall becomes thinner (7 - 9 cm (3 - 4 inches) more interior width)
More like 10 cm (4 inches), but you also add 10 cm (4 inches) external insulation in front of the masonry and the prospect—if the tightening of the energy savings regulations continues in the coming years—of having to dispose of this system as hazardous waste at high cost before you can implement further energy-saving measures. If you choose the 36.5 cm (14 inches) aerated concrete, you avoid these possible costs because you can add additional insulation materials without demolition work.
And—because E.Curb brought it up—the aerated concrete tolerates the material combination, here calcium silicate for the interior walls, better than hollow bricks.
Kind regards
Hello,
Building now while already considering a future energy performance upgrade of the building envelope is generally a good approach.
However, it would probably be more practical to integrate a higher insulation standard right from the start (due to inflation), for example, KfW EH55.
Best regards
Bauexperte schrieb:However, the choice of additional and suitable insulation materials is limited in this case. Moreover, the type of thermal insulation composite system (ETICS) and similar elements must be planned accordingly in advance.
..If you choose the 36.5 cm (14.4 inches) aerated concrete blocks, these possible costs do not apply because you can add additional insulation without further demolition measures.
Building now while already considering a future energy performance upgrade of the building envelope is generally a good approach.
However, it would probably be more practical to integrate a higher insulation standard right from the start (due to inflation), for example, KfW EH55.
Best regards
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