Hello
I am working on a special project where we are building a new apartment in an old barn/stable. We will be using sprayed eco-fiber in the walls and sloped ceilings/attic and keep this diffusion-open, but of course wind-tight. Now, the vapor resistance is supposed to be 5-6 times higher on the inside membrane compared to the outside membrane.
My question is whether you can use board on the outside instead of wind membrane to facilitate/create stiffness when it will be sprayed. I have no idea what vapor resistance the board might have and whether it is therefore conceivable.
I know what the inside membrane (Tyvek® VCL Vapor Barrier) has in terms of resistance so that's fine, but to calculate whether it works, I need the board's value/properties.
Does anyone know?
(when it comes to board, I am thinking of the simplest possible from something like Byggmax)
I am working on a special project where we are building a new apartment in an old barn/stable. We will be using sprayed eco-fiber in the walls and sloped ceilings/attic and keep this diffusion-open, but of course wind-tight. Now, the vapor resistance is supposed to be 5-6 times higher on the inside membrane compared to the outside membrane.
My question is whether you can use board on the outside instead of wind membrane to facilitate/create stiffness when it will be sprayed. I have no idea what vapor resistance the board might have and whether it is therefore conceivable.
I know what the inside membrane (Tyvek® VCL Vapor Barrier) has in terms of resistance so that's fine, but to calculate whether it works, I need the board's value/properties.
Does anyone know?
(when it comes to board, I am thinking of the simplest possible from something like Byggmax)
Have indeed found part of the answer in this study: http://www.ekofiber.se/Images/user/TorraSnedt.utan luftsp.SPLarsOlsson.pdf page 9 "The hard wood fiber board is so vapor-tight that moisture from convection accumulates in the construction at leakages."
