Additional insulation for exterior wall: Wind barrier, wind cloth and replace existing insulation?

[40talshuset]

I'm in the process of replacing the panel on a part of the house (the upper part of the gable ends, the facade is two-part). Behind the current facade is a dark brown "paper" which is a wind barrier paper if I understand it correctly. I have such at home on a roll, but is that type of fabric equivalent to newer alternatives like regular wind barrier fabric? Or is there any advantage to using the paper-like variant? The paper seems a bit thicker, but is it better in some way? The wind barrier paper is on the outside of the studs and inside is the additional insulation. Now, when I remove the facade, it will tear in some places, I know from experience, hence the replacement.

Additional question: Should one replace the additional insulation with new when doing this, or keep the older one? The old additional insulation was added in 1990 according to the documents, is it something that degrades over the years or is it unnecessary to replace? I believe it is glass wool or rock wool that is there now.

 

[Oldboy]

Windbreaker material is the traditional choice that has been used for a long time, and I suspect it's also the cheapest. The wind cloths that have been widely adopted perform the same job. As far as I know, there is no difference in how well they perform their task - protecting the insulation from wind drafts/air movement. Presumably, wind cloths are used because they are a bit quicker to set up (for professionals at least). So, you can use either one.

No, there is absolutely no reason to replace insulation from the '90s, unless it is perforated like Swiss cheese by rodents.

 

[40talshuset]

Wind paper is the traditional material that has been used for a long time, and I suspect it is also the cheapest. The windproof fabrics that have been largely adopted do the same job. As far as I know, there is no difference in how well they perform their task - to protect the insulation from wind drafts/air movement. Presumably, the windproof fabrics are used because they are a bit quicker to put up (for professionals at least).
So, you can use either.

No, there is absolutely no reason to replace insulation from the 90s, unless it is perforated like Swiss cheese by rodents.

Sounds good. No, the insulation looks great where I've been able to see it. I will keep the wind paper that holds the insulation today and then put windproof fabric outside the bottom boards since the current wind paper has taken a bit of damage here and there.

I assume there is no disadvantage to having double wind paper, with a little gap between them..?

 

[Oldboy]

I assume there's no disadvantage to having double wind protection paper, with a little space between them.. ?

No. The wind protection paper is moisture permeable, so no moisture can be trapped between the layers.