Exterior cladding without air gap?

[Vulcan61]

We will also be replacing the insulation inside as we are doing right now. Panel replacement will probably be next year or in a year. I thought of patching from the inside with regular windpaper since we have it at home. Then when we replace the paneling, we want to have wind membrane. It must be possible to have the windpaper on the inside and the membrane on the outside? Or am I thinking completely wrong?

 

[Vulcan61]

We are going to replace the insulation inside as well, which we are doing right now. Panel replacement will probably happen next year or in a few years. I thought about patching from the inside with regular windproof paper since we have it at home. Then, when we replace the panel, we want to have windproof film. It should be possible to have the windproof paper on the inside and the film on the outside, right? Or am I thinking completely wrong

the paper is currently attached from the inside when the edges are folded

 

[Vulcan61]

Mm

 

[KnockOnWood]

Must be possible to have the wind barrier on the inside and foil on the outside? Or am I thinking completely wrong

I am unsure.
But a rule is that the vapor resistance on the outside should be at most 1/2 or 1/3 (I am unsure about this) of the vapor resistance on the inside of the insulation.
There are surely others here who know this better

 

[Vulcan61]

I am uncertain.
But a rule is that the vapor diffusion resistance on the outside should be at most 1/2 or 1/3 (I am unsure about this) of the vapor diffusion resistance on the inside of the insulation.
There are surely others here who know this better

Ok, I guess it can't hurt with double layers of weather protection? But, you never know!

 

[Kallebo]

Isn't it rather the other way around?
Moisture always gets in one way or another.
And the dense paints prevent the moisture from getting out.

He means the opposite, you are on the same side. I painted with linoljefärg myself.

 

[KnockOnWood]

He means the opposite, you are on the same side. I myself painted with linoljefärg

Thank you, I now see that I got the negations a bit wrong

 

[Oldboy]

"can't hurt to have double layers of wind protection?"
Depends on how the inside is constructed. If there is building foil/plastic on the inside of the wall, then double layers are fine since the plastic is infinitely more moisture-resistant than the paper.
However, if there is no moisture barrier on the inside, it might cause problems, but it's quite unlikely. Two layers of wind barrier have double the moisture resistance/transmission value of a single layer. And, as KoW mentioned, a rule of thumb is that the inside should be at least 5 times tighter (in terms of moisture transmission) than the outside (normally the wind barrier).

 

[Vulcan61]

"kan väll inte skada med dubbla lager vindskydd?"
Depends on how the inside is constructed. If there is construction foil/plastic on the inside of the wall, it's fine with double layers, since the plastic is infinitely more moisture-proof than the paper.
However, if there is no moisture barrier on the inside, it might cause problems, though it's quite unlikely. Double layers of windproof paper provide twice the moisture resistance/permeability value as a single layer. And, as KoW mentioned, a rule of thumb is that the inside should be at least 5 times tighter (in terms of moisture permeability) than the outside (normally the windproof paper).

Ok no plastic on the inside, only paper behind the outer panel. I'll go with paper. Then a layer of foil the day the panel is replaced.

 

[Rulle53]

Will be horizontal. Today I have fjällpanel. But it's a hell to paint because the surface is so smooth planed.. So believe it will be z panel. Then it will be bison

The planed side should be facing inwards!

 

[Stefan1972]

The planed side should be inward!

It depends on what you are going to paint with......

 

[RSRC]

Exactly
If you have a good ftx I believe half the battle is won. If you have plastic on the inside - alternatively everything diffusion-open including facade paint another 40%
The remaining 10% are all exceptions.