ᐅ Correct Installation of Vapor Retarder at Knee Wall / Knee Wall Partition
Created on: 18 Feb 2021 11:57
J
Jörg H.Hello and hi,
a room in the attic is going to be renovated. I am currently stuck with the (proper) installation of the vapor retarder (climate membrane from ISOVER) at the knee wall / dwarf wall. I have already found three versions, but the question remains which one is correct, or if there is another option? I hope my attempt to sketch it clearly enough was successful (see attached file). Thanks in advance. Regards, Jörg
a room in the attic is going to be renovated. I am currently stuck with the (proper) installation of the vapor retarder (climate membrane from ISOVER) at the knee wall / dwarf wall. I have already found three versions, but the question remains which one is correct, or if there is another option? I hope my attempt to sketch it clearly enough was successful (see attached file). Thanks in advance. Regards, Jörg
That depends on the local conditions and accessibility.
You mentioned renovating only one room... what about the other rooms, how was it handled there? Is the drywall partition for the knee wall already installed?
Do you have a beam ceiling / floor like in the pictures?
If you have a concrete ceiling, I would consider option D: similar to option A, but I would bond everything to the floor instead of running underneath the drywall partition.
You mentioned renovating only one room... what about the other rooms, how was it handled there? Is the drywall partition for the knee wall already installed?
Do you have a beam ceiling / floor like in the pictures?
If you have a concrete ceiling, I would consider option D: similar to option A, but I would bond everything to the floor instead of running underneath the drywall partition.
Thank you for your quick response.
The other rooms are not relevant since they all have concrete ceilings and no ring beam. This concerns an extension, yes, with a beam ceiling, wooden floor, and impact sound insulation as shown in the pictures. The room was improperly insulated with aluminum-coated insulation material, but the knee wall was not insulated. Because of this, cold air is coming through the gap where the floorboards join into the room below. Furthermore, moisture penetrated the insulation, causing it to start molding. At the moment, I am carefully in the process of gutting everything. I have attached a few pictures...
The other rooms are not relevant since they all have concrete ceilings and no ring beam. This concerns an extension, yes, with a beam ceiling, wooden floor, and impact sound insulation as shown in the pictures. The room was improperly insulated with aluminum-coated insulation material, but the knee wall was not insulated. Because of this, cold air is coming through the gap where the floorboards join into the room below. Furthermore, moisture penetrated the insulation, causing it to start molding. At the moment, I am carefully in the process of gutting everything. I have attached a few pictures...
No partial insulation should be installed in the knee wall; rather, ventilation openings are needed so that the cooler air from the cavity can flow more easily into the living space and warm up.
The same vapor retarder also has the same Sd value. However, vapor diffusion should always be ensured.
Who would expect mold in this case?
The same vapor retarder also has the same Sd value. However, vapor diffusion should always be ensured.
Who would expect mold in this case?
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