Glass wool on timber frame

[medelnisse]

We have started planning to replace the paneling on the house.

The house is a timber house from the early 1900s and has been additionally insulated with Gullfiber.

Today, the walls look like this:
Exterior panel
Building paper
Gullfiber, 95 mm
Building paper
Old panel
Timber, 150 mm

My plan was to add an air gap and replace the additional insulation with wood fiber or cellulose.

But then I started thinking about whether to keep the old insulation and just add an air gap. The insulation and studs looked to be in good condition in the places I've checked behind the paneling.

How bad is it really with Gullfiber?
How would you have done it?

 

[Marcussellin]

If everything looks healthy and good, you might want to settle for removing the outer layer of cladding and the old wind barrier. Replace with a new wind barrier, 28-34 mm battens, and new cladding. If you have more time and money, you can remove everything down to the timber frame. As usual with old timber houses, you are likely to encounter some various damages around and under windows that require repairs. Then straighten and frame one pass with 34 battens, the second layer with 45 mm studs, Hunton insulation, barrier, battens, and new cladding. If the house is large, divide the facade sides over a few years if you choose the latter option. (takes time)

 

[Oldboy]

If the insulation is fine, there's absolutely no reason to replace it. It's just throwing money down the drain. Just make sure to properly rodent-proof the panel/facade.

 

[PeterFalun]

If the insulation is okay, there's absolutely no reason to replace it. It's just throwing money away.
Just make sure to protect the panel/facade from rodents properly.

exactly, protect against rodents, metal mesh (1.5*1.5mm), both at the bottom and top