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Silent80231 Jan 2019 23:35Hello dear forum,
We are building a prefabricated house with a ventilation system. Today we had our blower door test, and the result was n50=1.13. The site manager said this is within the standard (max. 1.5). Regarding the conditions:
The building envelope is in place, but the skirt is still missing—that is, the material that is attached to the base slab.
What do you think about this value? As the homeowner, do I have the option to request an improvement in the result?
Thanks and best regards
We are building a prefabricated house with a ventilation system. Today we had our blower door test, and the result was n50=1.13. The site manager said this is within the standard (max. 1.5). Regarding the conditions:
The building envelope is in place, but the skirt is still missing—that is, the material that is attached to the base slab.
What do you think about this value? As the homeowner, do I have the option to request an improvement in the result?
Thanks and best regards
Silent802 schrieb:
As a builder, do I have the option to request an improved value?Why? It already meets the standard! At 1.13, it is well below that. If you wanted to achieve Passive House standard, you would have needed to build accordingly.
No worries, don’t stress!
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boxandroof1 Feb 2019 01:19You cannot expect a better value, but you can definitely demand that defects are fixed. In our case, they also checked exactly where the leaks were.
I had similar values and called everyone back for a second test to discuss the defects. Of course, nobody was interested, and those involved suddenly got creative: "It’s passed anyway, the painter will fix the rest, drywall has to be airtight, not the vapor barrier," and other such stories.
The value isn’t particularly good, although I don’t know how much a fabric apron affects it. More important than the value is whether there are any defects. You won’t get another chance later.
A possible point to consider is the calculated air volume used during the test – according to my expert. If you calculate strictly and use the actual interior volume instead of the rough figure from the energy performance certificate, the test might be considered as failed.
I had similar values and called everyone back for a second test to discuss the defects. Of course, nobody was interested, and those involved suddenly got creative: "It’s passed anyway, the painter will fix the rest, drywall has to be airtight, not the vapor barrier," and other such stories.
The value isn’t particularly good, although I don’t know how much a fabric apron affects it. More important than the value is whether there are any defects. You won’t get another chance later.
A possible point to consider is the calculated air volume used during the test – according to my expert. If you calculate strictly and use the actual interior volume instead of the rough figure from the energy performance certificate, the test might be considered as failed.
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Silent8021 Feb 2019 07:41Thank you all for your responses.
The team went through every room in our house during the blower door test and checked all the corners. Their conclusion was that everything is sealed.
They suspect that the issue might be related to this skirt or possibly the chimney?!
Would you be concerned about the result at this value?
The team went through every room in our house during the blower door test and checked all the corners. Their conclusion was that everything is sealed.
They suspect that the issue might be related to this skirt or possibly the chimney?!
Would you be concerned about the result at this value?
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