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BauherrCS6 Nov 2011 13:17Hello everyone,
Despite searching extensively both on the major search engine and in this forum, I have unfortunately not found an answer to my problem. Therefore, I hope this is the right place and that someone here can help me.
Our construction project (a single-family house) is now almost complete. We have decided to have a blower door test and a leakage detection inspection carried out. The results are as follows:
The blower door test was successful (value 1.9 with a permitted limit of 3.0). However, the leakage detection, according to the expert, revealed significant defects.
Here is my first question: Is it possible for the blower door test to show a positive result despite leakage in the building envelope?
The leakage detection was performed as follows. Negative pressure was created inside the building, and at several points outside, a handheld smoke machine was used to generate smoke. Alarmingly, the smoke was strongly drawn into the building. This occurred, among other places, between the wall and floor, through the roller shutter boxes, and under the window sills. Further measurements with a thermo-anemometer showed values between 0.02 and 1.02.
In §6 of the Energy Saving Ordinance, I found the following:
“New buildings must be constructed in such a way that the heat-transferring building envelope, including joints, is permanently airtight in accordance with recognized rules of technology. [...]”
However, in the regulation, the only actually measurable value I found is the air change rate determined by the blower door test.
Therefore, in addition to my first question, I need help or answers regarding the following issues:
- Is there a defect if the blower door test is acceptable but the leakage detection shows negative results?
- How should I deal with the construction company if they rely on the positive blower door test result?
- What does “permanently airtight in accordance with recognized rules of technology” mean? Are the measured values possibly still within the acceptable range?
Sorry for the many questions, but getting answers would really help me a lot.
Thank you very much.
Best regards.
Despite searching extensively both on the major search engine and in this forum, I have unfortunately not found an answer to my problem. Therefore, I hope this is the right place and that someone here can help me.
Our construction project (a single-family house) is now almost complete. We have decided to have a blower door test and a leakage detection inspection carried out. The results are as follows:
The blower door test was successful (value 1.9 with a permitted limit of 3.0). However, the leakage detection, according to the expert, revealed significant defects.
Here is my first question: Is it possible for the blower door test to show a positive result despite leakage in the building envelope?
The leakage detection was performed as follows. Negative pressure was created inside the building, and at several points outside, a handheld smoke machine was used to generate smoke. Alarmingly, the smoke was strongly drawn into the building. This occurred, among other places, between the wall and floor, through the roller shutter boxes, and under the window sills. Further measurements with a thermo-anemometer showed values between 0.02 and 1.02.
In §6 of the Energy Saving Ordinance, I found the following:
“New buildings must be constructed in such a way that the heat-transferring building envelope, including joints, is permanently airtight in accordance with recognized rules of technology. [...]”
However, in the regulation, the only actually measurable value I found is the air change rate determined by the blower door test.
Therefore, in addition to my first question, I need help or answers regarding the following issues:
- Is there a defect if the blower door test is acceptable but the leakage detection shows negative results?
- How should I deal with the construction company if they rely on the positive blower door test result?
- What does “permanently airtight in accordance with recognized rules of technology” mean? Are the measured values possibly still within the acceptable range?
Sorry for the many questions, but getting answers would really help me a lot.
Thank you very much.
Best regards.
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