How to stabilize wall insulation between wind barrier and interior wall panel?

[CarJ]

We are in the process of building a small cabin, an anteroom for a caravan.
It should be movable, lightweight, and able to be cold-stored, with a diffusion-open construction.
The construction consists of, from outside to in, horizontal paneling, battens 22x45, wind barrier, supporting studs 45x95, hounton wood fiber insulation, diffusion brake, horizontal inner paneling.
Now to the embarrassing part. I had thought that the wind barrier, intended to hold from the outside, and the insulation, described as dimensionally stable, would be sufficient to keep the insulation in place. But now, as we've come this far in the construction, I realize it won't work.
The best would probably have been to use wider battens to provide support from outside.
One thought now is to staple some string between the studs from the inside near the wind barrier to hold the insulation in place.
Anyone have a better idea?

 

[fribygg]

Have you set the framework with 600mm center spacing or do you have 600mm between the studs?

 

[CarJ]

Have you set the framework with 600mm center distance or do you have 600mm between the studs?

Cc 60

 

[fribygg]

What spacing does the insulation manufacturer specify you should have?

 

[CarJ]

What spacing rule does the insulation manufacturer specify you should have

Cc 60, we have placed it in the floor and it fills out well. In the walls, it will press against the wind barrier, which is elastic. Since the battens are only 22, it will likely press all the way out to the outer panel, and then we no longer have a capillary-breaking "layer".

 

[fribygg]

How wide are the insulation boards?

 

[CarJ]

How wide are the insulation boards?

565 mm, distance between the studs 55.5

 

[CarJ]

565 mm, distance between the studs 55.5

555 mm

 

[fribygg]

I haven't tried Hunton myself, would recommend you to try with a regular sheet of Rockwoll Flexibatts (or some glass wool) and see if it works better.

 

[CarJ]

I haven't tried Hunton myself, would recommend you to try with a standard Rockwool Flexibatts (or some glass wool) and see if it works better.

Thanks, unfortunately rockwool and glass wool don't work so well with diffusion-open constructions, it would have been so much easier

 

[fribygg]

Sure, but you might as well try a piece of flexibatts to find out if it's your framework or the insulation you've chosen that's the problem.

 

[CarJ]

Sure, but you can still try a piece of flexibatts to determine if it's your framework or the insulation you've chosen that's the problem.

I have used both fiberglass and stone wool before, but against rigid surfaces. I think the idea that only the wind barrier, which is much more elastic than a wind paper, is causing the issue. I think I somehow need to "help" the wind barrier withstand the pressure from the insulation, but it's not easy when large parts of the outer panel are already in place.

 

[Bo arnold]

Use asphalt board instead of wind barrier, I believe it is also manufactured by Hunton.

 

[CarJ]

Use asphalt board instead of wind barrier, I think it's Hunton that manufactures it too

Hi Bo, yes, we considered that but wanted to keep the weight down since it will be moved. In hindsight, it would have been a good idea anyway. Now almost the entire panel is up so I need to find a solution that still works. I think we’re leaning towards placing masonry wire with staples between the wall studs to support the insulation against the wind barrier, but I’m open to other suggestions

 

[Bo arnold]

Nail a row of brads into the rafters from the inside and press the insulation onto them.