Hello,
We have just built a KfW70 prefabricated house. We do not have a mechanical ventilation system, but in all windowless rooms, a room ventilation system has been planned. This runs through the roof for interior rooms and through the wall for the pantry.
In a small bathroom, we have a fan (as expected), but the ventilation in the other rooms is simply a pipe leading to the roof. In the pantry, there is even just an approximately 10 cm (4 inch) hole in the wall, which is supposed to be covered on both sides with a plastic cap.
Is this normal? What is the use of the best insulation if we have holes in the walls and leading to the roof? And won’t this cause extremely poor results in the blower door test?
We have just built a KfW70 prefabricated house. We do not have a mechanical ventilation system, but in all windowless rooms, a room ventilation system has been planned. This runs through the roof for interior rooms and through the wall for the pantry.
In a small bathroom, we have a fan (as expected), but the ventilation in the other rooms is simply a pipe leading to the roof. In the pantry, there is even just an approximately 10 cm (4 inch) hole in the wall, which is supposed to be covered on both sides with a plastic cap.
Is this normal? What is the use of the best insulation if we have holes in the walls and leading to the roof? And won’t this cause extremely poor results in the blower door test?
Why? A small windowless toilet should have a fan, shouldn’t it?
Bauexperte schrieb:
Good evening,
Who sells or installs something like that?
Regards, Bauexperte
D
Doc.Schnaggls1 Dec 2014 09:25Sounds strange...
If it really stays like that, in my opinion, the blower door test becomes pointless.
During our blower door test, there was exactly one opening in the building envelope, which was the flue pipe connection at the chimney on the ground floor, as our stove had not yet been installed.
That should be quite similar to your "ventilation through the roof" for your interior rooms.
However, our flue pipe connection was carefully sealed to prevent any drafts.
If it really stays like that, in my opinion, the blower door test becomes pointless.
During our blower door test, there was exactly one opening in the building envelope, which was the flue pipe connection at the chimney on the ground floor, as our stove had not yet been installed.
That should be quite similar to your "ventilation through the roof" for your interior rooms.
However, our flue pipe connection was carefully sealed to prevent any drafts.