Interior permanent wall covering

[Northtwin]

How much does that FRP board run? Can you buy it at Menards , Lowes etc...?

[Dacotah Eye]

I bought it at Menards and I don't remember how much it was per sheet. I'm pretty sure it was more than $20 per sheet. The good thing about it is that it is permanent.

[Marius Titulescu]

I would also go with wall panels, especially if you cover them with something (might look better).
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Marius
wallcoverings montreal

[teamlund]

I built a 6x8 shack a few years ago. I put up cedar wall paneling. It wasn't actual cedar, just looked like it. I sanded the bottom foot of the panels and painted them black to keep water from getting to the wood fibers. Worked fine, I screwed them on and also used construction adhesive. Solid as a rock.