ᐅ Bought a sandwich roof but received a different type of roof?
Created on: 9 Dec 2021 14:58
J
johannMuc
Hello everyone,
I have a question. In the construction description from the developer, it says that the house will have a roof made of sandwich panels. But when looking at the photos of the progress, no sandwich panels seem to be used.
At least, that’s how it looks to me. However, I’m really not an expert here. So my question is, can someone tell me what the roof structure is called if it isn’t made of sandwich panels? Or could it still be considered a type of sandwich construction?
Question 2: Does this look correct?
As a final image, here is an excerpt from the construction description regarding the roof execution.
Thanks to everyone!
I have a question. In the construction description from the developer, it says that the house will have a roof made of sandwich panels. But when looking at the photos of the progress, no sandwich panels seem to be used.
At least, that’s how it looks to me. However, I’m really not an expert here. So my question is, can someone tell me what the roof structure is called if it isn’t made of sandwich panels? Or could it still be considered a type of sandwich construction?
Question 2: Does this look correct?
As a final image, here is an excerpt from the construction description regarding the roof execution.
Thanks to everyone!
J
johannMuc10 Dec 2021 12:51apokolok schrieb:
You are building a multi-family house in Munich worth several million, and there is no one except this forum who can answer your questions? I only purchased a small apartment in the complex and just want to avoid bigger problems in the future.
It seems I am the only one questioning the measures. At least, I haven’t heard any other questions from other buyers. The developer also keeps the buyers nicely separated...
johannMuc schrieb:
And I just want to avoid bigger problems in the future.
It seems I’m the only one questioning the measures taken. Well, we’re talking about an apartment here, not a Ferrari that would significantly lose its collector’s value due to hail damage. I consider the waves to be effects of thermally active materials. Whether they will fully snap back to their original shape in midsummer, I can’t say. I don’t expect any leaks. I suspect that compromises were made regarding the recommended thermal production and storage conditions, likely due to scheduling pressures, meaning the sandwich panels were manufactured without allowing the metal sheets and insulation core to acclimate properly before being processed and bonded together. This is not normal—but I’m not an expert who could tell you whether this is technically a serious issue or a minor one. The dents will not affect the resale value if an expert confirms they are purely cosmetic. To my knowledge, there are no experts for this within the forum—at best @Jann St or @nordanney might be able to help...
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Thanks for the link, but I also lack experience with these products.
At first glance, it doesn't seem quite right to me. Whether this will lead to consequential damage from defects, I’m not in a position to judge.
If you have bought an apartment, then there is usually a homeowners’ association. They have certainly commissioned an independent expert for the acceptance inspection. I would direct this question to them.
However, I’m also somewhat uncertain about the construction. The steel beams might cool down due to the small concrete cover and transfer the cold to the rough installation. A thermal bridge calculation should have been carried out, because otherwise the reinforced concrete could also cool down locally, potentially causing condensation in the floor below.
But modern buildings are all required to include such an assessment, so it seems to be okay.
At first glance, it doesn't seem quite right to me. Whether this will lead to consequential damage from defects, I’m not in a position to judge.
If you have bought an apartment, then there is usually a homeowners’ association. They have certainly commissioned an independent expert for the acceptance inspection. I would direct this question to them.
However, I’m also somewhat uncertain about the construction. The steel beams might cool down due to the small concrete cover and transfer the cold to the rough installation. A thermal bridge calculation should have been carried out, because otherwise the reinforced concrete could also cool down locally, potentially causing condensation in the floor below.
But modern buildings are all required to include such an assessment, so it seems to be okay.
J
johannMuc13 Dec 2021 06:59Hello dear forum members. Thanks to your many very helpful opinions, I was able to get a statement from the developer:
…Since this does not constitute a construction defect, and minor waviness can always occur and is also permitted according to the technical rules of standing seam roofing. I would also like to point out that waviness will increase in the summer in areas that are currently smooth.
This is partly due to the different temperatures of the metal sheets during installation and partly due to the expansion of the sheets at higher or lower temperatures. That is why they are installed with so-called “sliding clips,” which allow a certain range of movement.
However, at roof windows and angled cuts, “fixed clips” must be used, which, as the name suggests, are rigid. The purpose is to direct the movement of the sheet in a specific direction. This controls expansion in the desired direction.
If several of these fixed points come together, and the sheets do not have exactly the same temperature, this can cause the waviness you see, as the metal adjusts differently after installation.
This is not a construction defect and in no way affects the waterproofing of the roof. Everything is interlocked, making the roof practically one large aluminum panel. For this reason, it is very difficult to replace anything here.
We have decided to replace this one less successful aluminum panel from the eaves to the ridge at considerable expense. The rest, considering the many adjacent components and natural laws, has been executed more than perfectly. There is nothing to criticize here.
…Since this does not constitute a construction defect, and minor waviness can always occur and is also permitted according to the technical rules of standing seam roofing. I would also like to point out that waviness will increase in the summer in areas that are currently smooth.
This is partly due to the different temperatures of the metal sheets during installation and partly due to the expansion of the sheets at higher or lower temperatures. That is why they are installed with so-called “sliding clips,” which allow a certain range of movement.
However, at roof windows and angled cuts, “fixed clips” must be used, which, as the name suggests, are rigid. The purpose is to direct the movement of the sheet in a specific direction. This controls expansion in the desired direction.
If several of these fixed points come together, and the sheets do not have exactly the same temperature, this can cause the waviness you see, as the metal adjusts differently after installation.
This is not a construction defect and in no way affects the waterproofing of the roof. Everything is interlocked, making the roof practically one large aluminum panel. For this reason, it is very difficult to replace anything here.
We have decided to replace this one less successful aluminum panel from the eaves to the ridge at considerable expense. The rest, considering the many adjacent components and natural laws, has been executed more than perfectly. There is nothing to criticize here.
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