Hello,
we have just finished the shell and roof of our KFW40+ house.
Now I have mounted the electrical panel on the (unfinished) interior wall and might not have considered the following.
Unfortunately, during the shell construction, we missed applying a smooth plaster layer at the points where the interior walls meet the exterior wall. This would serve as an airtight layer between the exterior wall and the interior wall connection. (Masonry: Poroton)
Now I am wondering how problematic this could be for the blower door test.
Do I need to plaster behind the electrical panel now? Do I also need to install airtight electrical boxes inside the interior walls?
I have absolutely no idea how much pressure loss is acceptable or what impact this might have.
Thanks for any answers!
we have just finished the shell and roof of our KFW40+ house.
Now I have mounted the electrical panel on the (unfinished) interior wall and might not have considered the following.
Unfortunately, during the shell construction, we missed applying a smooth plaster layer at the points where the interior walls meet the exterior wall. This would serve as an airtight layer between the exterior wall and the interior wall connection. (Masonry: Poroton)
Now I am wondering how problematic this could be for the blower door test.
Do I need to plaster behind the electrical panel now? Do I also need to install airtight electrical boxes inside the interior walls?
I have absolutely no idea how much pressure loss is acceptable or what impact this might have.
Thanks for any answers!
During the very strong wind last week, we noticed a draft at the electrical boxes in the exterior wall.
At one box, the flame of a lighter even went out.
There are always some gaps in the masonry, so it was basically correct that the interior walls should have been plastered at the joint with the exterior wall.
At one box, the flame of a lighter even went out.
There are always some gaps in the masonry, so it was basically correct that the interior walls should have been plastered at the joint with the exterior wall.
S
Schluffi081510 Nov 2017 21:10I think so too!
Unfortunately, it’s too late for that.
For now, my priority is to pass the blower door test. Unfortunately, I have no sense for it. I’m curious about how high the failure rate usually is.
Unfortunately, it’s too late for that.
For now, my priority is to pass the blower door test. Unfortunately, I have no sense for it. I’m curious about how high the failure rate usually is.
N
nightdancer11 Nov 2017 11:28Schluffi0815 schrieb:
I spoke with a well-known electrician. He said it’s not a big deal. For solid construction, he doesn’t use airtight boxes. He uses standard boxes and seals them with non-expanding PU foam. He says that’s sufficient.Since when has that been according to the state of the art? Even in solid construction, airtight boxes are installed in the exterior walls. The cable routing for the external roller shutter is also sealed airtight on both the inside and outside.
OP, just do a blower door test once the windows are installed and the basic electrical wiring is completed—before screed and before drywall or other interior finishes. Then you’ll know more. A timely leakage test is invaluable. A value of 1.5 is basically a poor result. For me, any new build above 0.6 would be unacceptable.
S
Schluffi081511 Nov 2017 13:40nightdancer schrieb:
Since when is something like that in line with the aRdT?! Even in solid construction, airtight boxes are installed in the exterior walls. The cable routing for the external roller shutter is also sealed airtight on both the inside and outside.
TE, just do a blower door test once the windows are installed and the basic electrical installation is complete, before the screed and before drywall and other interior finishing. Then you’ll know more. An early leakage test is invaluable. A result of 1.5 is basically a poor value. Anything above 0.6 in new builds would be unacceptable for me.That’s exactly how I’m going to do it as well. Airtight boxes on the outside, regular boxes on the inside, well plastered.I also plastered the walls of my inspection shaft (adjacent to an interior wall) just to be safe.
What I’ve realized is that you can’t really rely on any single statement.
The same goes for energy consultants and architects—they all say different things (in general).
I have no problem with roller shutters (inspection from the outside). I used concrete cables, without conduit, which go directly into the roller shutter box.
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