I want to install wood grain finish panel on interior walls and on ceil
in my new construction.
The construction is a small inexpensive one room chalet (16' x 24')
I did it myself with some friends and I will spend there my weekends
and some vacation and is in Canada.
The wood grain finish panels are 4' x 8' sizes and thickness is 2.6
mm.
I would need some advice how to install them on the wall and on the
ceiling of the cathedral roof.
I want to avoid them to be undulated because of dilatation (expansion).
I did just add R-20 pink fiber glass insulation on the wall (studs is
2"x6" at 16" on center) and cover with 6 mil vapor barrier.
How should I put these panels in order to cover the walls and the ceil?

May I put them directly on studs in contact with vapor panel? Or is
better to use some horizontally furring strips?
Also I would not like to use a gypsum wallboard as a back support.

Thanks,
Chris

Chris wrote:
I want to install wood grain finish panel on interior walls and on ceil
... panels are 4' x 8' sizes and thickness is 2.6 mm.
I would need some advice how to install them on the wall and on the
ceiling of the cathedral roof.
I want to avoid them to be undulated because of dilatation (expansion).
I did just add R-20 pink fiber glass insulation on the wall (studs is
2"x6" at 16" on center) and cover with 6 mil vapor barrier.
How should I put these panels in order to cover the walls and the ceil?

May I put them directly on studs in contact with vapor panel? Or is
better to use some horizontally furring strips?
Also I would not like to use a gypsum wallboard as a back support.

Don't know the specific and you don't say what the material is, but the
dimensions given indicate this is a very thin ( 1/8") panel. In order
to keep something that thin flat you definitely will need furring
strips or other stiffer material behind them, especially on a ceiling.
I'd think 2-ft spacing might be adequate. As always, for required
spacing between sheets to account for expansion and recommended use
including backer material, etc., check manufacturer's recommended
installation notes which are almost always available either in the
retailer's location or online. I'd venture a small gap just so they
don't butt hard up against each other would be adequate for interior
use, but that will obviously depend on what the panel is made of as
various composites have differing expansion characteristics (mostly
humidity-related).

I used some of this some years ago in a summer place in the Poconos. I
put it on over conventional dry wall. Even with LOTS of panel cement
and nails, still had some problems with moisture causing buckling. Make
sure to leave a little space between panels for expansion. Run a stripe
of black paint/stain down the joint before you put the panels up, or
you will see the dry wall. On the outside walls, the dry wall had
insulation behind it. It was pretty thin stuff.