ᐅ Is it practical to use material for exterior walls without insulation?
Created on: 9 Oct 2018 19:08
A
alex-md
Hello everyone,
I’m new to the forum and currently planning a house.
I already have a quote that includes exterior walls made of 36.5cm (14.4 inches) Poroton blocks without external insulation, just plaster.
Does that make sense, or would you advise against it?
With this construction method, would you recommend adding reinforcement to the exterior plaster to prevent possible cracking?
According to my scope of work description:
For the exterior plaster system, a lime-cement plaster with a thickness of 1.5cm to 2.0cm (0.6 to 0.8 inches) is applied onto the Poroton masonry. On top of that, a finishing coat is applied using a 2mm (0.08 inches) synthetic resin plaster.
Reinforcement is only listed in the scope of work for the version with external insulation, which we are not doing.
I’m looking forward to your opinions.
Best regards,
alex-md
I’m new to the forum and currently planning a house.
I already have a quote that includes exterior walls made of 36.5cm (14.4 inches) Poroton blocks without external insulation, just plaster.
Does that make sense, or would you advise against it?
With this construction method, would you recommend adding reinforcement to the exterior plaster to prevent possible cracking?
According to my scope of work description:
For the exterior plaster system, a lime-cement plaster with a thickness of 1.5cm to 2.0cm (0.6 to 0.8 inches) is applied onto the Poroton masonry. On top of that, a finishing coat is applied using a 2mm (0.08 inches) synthetic resin plaster.
Reinforcement is only listed in the scope of work for the version with external insulation, which we are not doing.
I’m looking forward to your opinions.
Best regards,
alex-md
0.09 refers to the lambda value, meaning thermal conductivity. For Poroton bricks, I believe this is even included in the product type designation. I think there are also some with 0.07.
Reinforcement in the plaster is necessary with external insulation because facade insulation boards are softer than bricks. Try knocking on a polystyrene wall 🙂
In monolithic construction, it is negligible.
Reinforcement in the plaster is necessary with external insulation because facade insulation boards are softer than bricks. Try knocking on a polystyrene wall 🙂
In monolithic construction, it is negligible.
We have a monolithic wall construction with 36.5cm (14.4 inches) thick blocks, and the exterior plaster was still applied with reinforcement. However, I have no idea what impact this had on the cost. Our architect always specifies it that way, and the plasterer obviously uses this method quite often. It definitely seems to be a very high-quality approach.
The indoor climate in the house is excellent, and I would not want an external insulation system (ETICS / EIFS). We had that on an extension of my apartment. The roofer wasn’t careful with the ladder once, and suddenly there was a hole. Besides, it’s simply a thick polystyrene shell...
The indoor climate in the house is excellent, and I would not want an external insulation system (ETICS / EIFS). We had that on an extension of my apartment. The roofer wasn’t careful with the ladder once, and suddenly there was a hole. Besides, it’s simply a thick polystyrene shell...
The full-surface reinforcement layer is usually applied in a two-coat plaster system between the first and second layers. Whether the reinforcement layer is necessary depends on various factors. For a 2mm (0.08 inch) topcoat, I would recommend using a full-surface reinforcement layer. Otherwise, manufacturers often provide instructions on how to apply the plaster system.
Just check with the construction company again and ask them to explain it.
Just check with the construction company again and ask them to explain it.
M
Mottenhausen13 Nov 2018 12:40Interior/exterior plaster unchanged:
- 365mm (14 inches) Poroton blocks in a corner result in approximately U=0.21, depending on the specific brick.
- 300mm (12 inches) Poroton blocks + 60mm (2.4 inches) external thermal insulation composite system (ETICS) U=0.18
- 240mm (9.5 inches) Poroton blocks + 120mm (4.7 inches) ETICS U=0.16
The total wall thickness remains the same in all cases. Looking at the requirements catalogs, option 1 meets the Energy Saving Ordinance 16, option 2 surpasses KfW55 standards, and option 3 reaches the KfW40 level or the so-called "3-liter house."
Don’t think only about winter. Summers are getting warmer and longer, and an ETICS also prevents the brick from heating up due to sunlight exposure.
With the next Energy Saving Ordinance, it will be difficult to manage without ETICS, so this issue will finally be resolved.
- 365mm (14 inches) Poroton blocks in a corner result in approximately U=0.21, depending on the specific brick.
- 300mm (12 inches) Poroton blocks + 60mm (2.4 inches) external thermal insulation composite system (ETICS) U=0.18
- 240mm (9.5 inches) Poroton blocks + 120mm (4.7 inches) ETICS U=0.16
The total wall thickness remains the same in all cases. Looking at the requirements catalogs, option 1 meets the Energy Saving Ordinance 16, option 2 surpasses KfW55 standards, and option 3 reaches the KfW40 level or the so-called "3-liter house."
Don’t think only about winter. Summers are getting warmer and longer, and an ETICS also prevents the brick from heating up due to sunlight exposure.
With the next Energy Saving Ordinance, it will be difficult to manage without ETICS, so this issue will finally be resolved.
Mottenhausen schrieb:
With the next energy saving regulation, it will be difficult without ETICS, then the issue will finally be settled. There are still wall constructions with 42.5cm (17 inches) and 50cm (20 inches) thickness WITHOUT insulation...
That should still be possible even with new energy saving regulations to come.
Regarding the topic:
I would at least have reinforcement applied at the junctions between Poroton <-> concrete/insulation.
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