H
Hanseatic22 Apr 2012 08:11Hello,
Over the past year, I have insulated and converted my attic. From the inside out: drywall, 50mm (2 inches) mineral wool, vapor retarder, 180mm (7 inches) mineral wool, breathable membrane. Before installing the drywall, I noticed that the vapor retarder would move during strong winds. I thought this was normal since it serves as the airtight barrier to the outside, which I carefully sealed to the walls and floor.
Now I have noticed that there is a draft coming through the electrical outlets and cable penetrations in the ceiling when it is windy.
Could this be caused by overpressure building up beneath the drywall when the wind presses against my insulation? Has anyone else observed something similar?
I would appreciate any feedback.
Regards
Over the past year, I have insulated and converted my attic. From the inside out: drywall, 50mm (2 inches) mineral wool, vapor retarder, 180mm (7 inches) mineral wool, breathable membrane. Before installing the drywall, I noticed that the vapor retarder would move during strong winds. I thought this was normal since it serves as the airtight barrier to the outside, which I carefully sealed to the walls and floor.
Now I have noticed that there is a draft coming through the electrical outlets and cable penetrations in the ceiling when it is windy.
Could this be caused by overpressure building up beneath the drywall when the wind presses against my insulation? Has anyone else observed something similar?
I would appreciate any feedback.
Regards
Hello,
The wind should not be able to reach your insulation and vapor barrier to the point that it moves them. The vapor barrier is the airtight layer designed to prevent moist air from the interior from entering the building structure. On the outside, there is the windproof layer, often called the breather membrane or house wrap, which protects the entire structure, among other things, from wind.
If your insulation and vapor barrier flap in the wind, there are likely some connection or sealing defects somewhere, but these cannot be identified here or from a distance.
Best regards
Hanseatic schrieb:
......you could see the vapor barrier moving in strong wind. I thought that was okay since it is the airtight layer to the outside,
The wind should not be able to reach your insulation and vapor barrier to the point that it moves them. The vapor barrier is the airtight layer designed to prevent moist air from the interior from entering the building structure. On the outside, there is the windproof layer, often called the breather membrane or house wrap, which protects the entire structure, among other things, from wind.
If your insulation and vapor barrier flap in the wind, there are likely some connection or sealing defects somewhere, but these cannot be identified here or from a distance.
Best regards
H
Hanseatic22 Apr 2012 17:41Thank you for the quick response.
I installed the insulation later in the roof structure. Therefore, I fixed the underlayment membrane from rafter to rafter, only at the floor level where the insulation is located. The underlayment membrane ends in the uninsulated attic space. It is probably not a windproof layer; rather, it protects the mineral wool from any potential raindrops that might get through the roof tiles and roofing felt.
Regards
I installed the insulation later in the roof structure. Therefore, I fixed the underlayment membrane from rafter to rafter, only at the floor level where the insulation is located. The underlayment membrane ends in the uninsulated attic space. It is probably not a windproof layer; rather, it protects the mineral wool from any potential raindrops that might get through the roof tiles and roofing felt.
Regards
H
Hanseatic23 Apr 2012 16:46Hello,
I have installed ventilation behind the wall. I further tested around the electrical outlets: I held a lighter in front of the outlets and opened and closed the room door normally. Each time, there is an airflow that sometimes even blows out the flame. The outlets are also installed in the hollow side wall. Maybe this is normal?
Regards
I have installed ventilation behind the wall. I further tested around the electrical outlets: I held a lighter in front of the outlets and opened and closed the room door normally. Each time, there is an airflow that sometimes even blows out the flame. The outlets are also installed in the hollow side wall. Maybe this is normal?
Regards
Hanseatic schrieb:
Maybe this is all normal?No, definitely not
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