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Theodorius10 Jan 2019 15:05Hello!
Due to new construction plans, I have been researching insulation materials.
As a result, I now understand that the insulation should ideally be separated from the indoor air by a vapor barrier to prevent moisture from condensing in or on it once the dew point reaches that area.
I have also gathered the impression that, for this reason, an insulation material should ideally be hydrophobic, meaning it should not absorb moisture. Am I correct in this assessment?
Therefore, it should ideally be a closed-cell insulation material, which quickly led me to extruded polystyrene foam (XPS).
This material will be applied to the interior surface, onto the aerated concrete blocks, and it is also planned for use under the screed.
I am now considering whether I can also use XPS for the roof due to its ideal properties...
Due to new construction plans, I have been researching insulation materials.
As a result, I now understand that the insulation should ideally be separated from the indoor air by a vapor barrier to prevent moisture from condensing in or on it once the dew point reaches that area.
I have also gathered the impression that, for this reason, an insulation material should ideally be hydrophobic, meaning it should not absorb moisture. Am I correct in this assessment?
Therefore, it should ideally be a closed-cell insulation material, which quickly led me to extruded polystyrene foam (XPS).
This material will be applied to the interior surface, onto the aerated concrete blocks, and it is also planned for use under the screed.
I am now considering whether I can also use XPS for the roof due to its ideal properties...
Styrodur is a brand name, like Tempo, and not a building material by itself. What you probably mean is XPS, which is used under the concrete slab and as perimeter insulation. XPS doesn’t have "ideal" properties but has characteristics that are specifically suitable for this purpose. Under no circumstances should this material be used on interior walls or on the roof. I’m starting to seriously wonder if you’re just trolling with your threads…
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Theodorius10 Jan 2019 15:42I am a very balanced person and therefore not interested in arguments... so let’s stay on topic:
WHY shouldn’t Styrodur be applied to the inner layer or under the roof?
(By the way, it seems my builder also wants to “troll,” because he is currently installing Styrodur on my inner layer... a company with 40 years of history...)
Lumpi: If I knew everything like you do, I wouldn't even need to be registered in any forum.
WHY shouldn’t Styrodur be applied to the inner layer or under the roof?
(By the way, it seems my builder also wants to “troll,” because he is currently installing Styrodur on my inner layer... a company with 40 years of history...)
Lumpi: If I knew everything like you do, I wouldn't even need to be registered in any forum.
What do you mean by inner shell?
At the top, you mention putting insulation on the inside of the Ytong blocks. Anyone who attaches insulation, whether XPS, EPS, or mineral wool, directly to the inside of Ytong blocks doesn’t know what they’re doing. If they really do that, then congratulations.
Polyurethane belongs on the roof, EPS is cost-effective for ceilings. On the outside (!) of the walls, you can use various materials; economically, EPS or mineral wool is preferred, but definitely not XPS.
At the top, you mention putting insulation on the inside of the Ytong blocks. Anyone who attaches insulation, whether XPS, EPS, or mineral wool, directly to the inside of Ytong blocks doesn’t know what they’re doing. If they really do that, then congratulations.
Polyurethane belongs on the roof, EPS is cost-effective for ceilings. On the outside (!) of the walls, you can use various materials; economically, EPS or mineral wool is preferred, but definitely not XPS.
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