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bastiundanne6 Feb 2010 18:04Hello and good evening!
Last week, the upper floor of our single-family house was insulated and sealed with a vapor barrier membrane. Since the house is built with Poroton bricks, the exterior wall sealing (hopefully airtight) is provided by the interior plaster.
Now, we plan to finish the attic space ourselves and want to start with the tongue-and-groove boards (flooring) tomorrow.
The membrane has been laid by the drywall installers from the attic floor up to the central rafter, so that I can later attach "my" membrane directly overlapping it.
Here is the problem: The gable end will probably also be plastered inside the attic, but at the level of the ceiling between the upper floor and the attic, there will be an unplastered strip of the exterior wall. This strip will be just below the tongue-and-groove boards we install and above the membrane at the upper floor ceiling.
Does this strip of the exterior wall need additional sealing? If yes, how should it be done?
Last week, the upper floor of our single-family house was insulated and sealed with a vapor barrier membrane. Since the house is built with Poroton bricks, the exterior wall sealing (hopefully airtight) is provided by the interior plaster.
Now, we plan to finish the attic space ourselves and want to start with the tongue-and-groove boards (flooring) tomorrow.
The membrane has been laid by the drywall installers from the attic floor up to the central rafter, so that I can later attach "my" membrane directly overlapping it.
Here is the problem: The gable end will probably also be plastered inside the attic, but at the level of the ceiling between the upper floor and the attic, there will be an unplastered strip of the exterior wall. This strip will be just below the tongue-and-groove boards we install and above the membrane at the upper floor ceiling.
Does this strip of the exterior wall need additional sealing? If yes, how should it be done?
bastiundanne schrieb:
Now the attic is also going to be finished by ourselves, and we want to start tomorrow with the rough-sawn boards (flooring).Great that you’re asking today!
Forget about doing it yourself and get professional help for this!
Otherwise, it would be a waste of the materials, the work effort, and everything that has already been built!
The vapor barrier film has been laid by the drywall installers down to the floor up to the central purlin, so that I can later fix "my" film overlapping directly to it.Where exactly "down to the floor" and how was the vapor barrier connected?
Now the problem: The gable will probably be plastered in the attic, but at the height of the ceiling between the upper floor and the attic, a strip of the exterior wall will remain unplastered. Basically, below the rough-sawn boards installed by us and above the vapor barrier at the ceiling of the upper floor.You described the problem perfectly! Unfortunately, there is no universal solution for this, and these connections that are hardly airtight in practice often lead to significant moisture issues!
Does this strip of the exterior wall need to be additionally sealed? If "yes," how?3 times "yes"!
Your designer/architect must tell you “how”! Everything else can be thrown away, sorry!
Apart from the designer, the drywall installer is also responsible for the airtight installation...!
The only solution is to install a blower door test system, carry out differential pressure leakage tests... again and again until no air exchange is detected! At the same time, it must be ensured that the durability of the airtightness layer’s function is guaranteed...
...and only then should you start your DIY work!
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