Make loft corridor habitable

[Injen]

In the boy's room, there is a loft passage that is as long as his room and about 160cm wide with a slanted roof. The idea was to remove the door to the loft passage and make that part livable, possibly placing his bed there if he so wishes. The loft passage is usually nailed with planks on both the walls, ceiling, and floor with a few mm gaps where sawdust constantly comes through

What material would you choose to nail it all together? Hardboard, gypsum, or chipboard? Hardboard feels like the best choice since it doesn't build up much. It's worth mentioning that there are a lot of angles and small corners in the loft passage, so a simple material is preferable. How does it work with, e.g., Treetex?

 

[Maximarcus]

Treetex doesn't have many good qualities if you ask me. I think plaster is the easiest to make look good, the fact that it's a bit thicker shouldn't really matter that much. Remember to tape all the seams!

 

[Oldboy]

It might be worth adding that there are quite a few angles and small corners in the corridor, so a simple material would be preferable.

Depends on how you plan to handle all the external corners of the cladding?
Nothing at all?
External corner moldings?
Recessed quarter rounds?

Personally, I avoid plaster like the plague because it has to be plastered everywhere, and all external corners must be protected by something strong, i.e., steel or solid wood.

 

[Injen]

Depends on how you plan to handle all the outer corners of the covering?
Nothing at all?
Overlay corner strips?
Recessed quarter rounds?

Personally, I avoid drywall like the plague because it needs to be filled everywhere, and all outer corners must be protected by something strong, i.e., steel or solid wood.

It will probably be quarter rounds to make it completely tight.

 

[Oldboy]

Then 12 mm plywood might work.
It is relatively robust.