Hello!
We have an old door in the exterior wall that we need to build over. We need some help with the construction.

Initially, we thought (from inside out) drywall, OSB, studs and insulation, moisture barrier, battens and air gap, and then exterior cladding.

But when I Google "exterior wall construction," it suggests it should be built up; drywall, OSB, battens and a thin layer of insulation called an installation layer, moisture barrier, studs and insulation, wind protection layer, battens and air gap, and finally exterior cladding.

Do we need to go "all out" when it's just a doorway that's fairly protected anyway? See pictures... It's the door all the way in the corner to the left in the picture taken indoors.

How would you experts solve the doorway problem? We're real newbies, so we'll probably need an explanation for dummies.
 
  • Interior view of a partially renovated room with open walls and a vacuum cleaner. A door is visible in the left corner, in need of sealing.
  • A brick house exterior with a white door and a single window; grassy yard in the foreground and leafless trees in the background.
  • Wall construction diagram showing layers: red paneling, wooden battens, insulation, blue wind barrier, OSB board, gypsum, with numbers indicating order.
Rickard.
The vapor barrier (moisture barrier) should be on the inside of the insulation, and then you should have wind protection on the outside of the insulation, such as windcloth. Otherwise, your proposal is fine; there are many different good solutions.
 
Rickard. Rickard.ag said:
The moisture barrier (vapor barrier) should be on the inside of the insulation and you should have wind protection on the outside of the insulation, such as wind membrane. Otherwise, your suggestion is okay, there are many different good solutions.
Could you skip the "installation layer" and go with; drywall, OSB, vapor barrier, studs and insulation, wind protection, battens and air gap, and lastly paneling?
 
Rickard.
Yes, the installation layer is a relatively new concept and is really good (theoretically and in my opinion) in new well-insulated houses. But it is absolutely not something you need to worry about for a door.
 
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Willewonka and 2 others
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I am working on the exact same project but for an isolated outbuilding. Trying to figure out if plastic is good or bad?
Should the new wind barrier be sealed against the existing one somehow, or is a staple gun enough?
How thick should the battens or whatever they are called that you nail the paneling into be?

I plan to put molding around everything so it still looks like a door from the outside.

Is there anything I should consider?
Do you need to seal with anything (under the moldings) where the new panel meets the old one?
They are different tongue and groove and cannot be knocked together.
It's an old construction trailer, stud thickness approximately 9cm, I think.
 
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