Replace 9mm Masonite board

[owaysis]

Hey!

I'm in the process of renovating my kitchen and needed to take down a masonite board to run new electrical lines. Now I need to replace that board, but unfortunately, masonite boards in 9 mm are not made anymore. What might be the best alternative?

9mm plywood is available, but is it okay to use as a wall panel?

Another option is a 3mm masonite board together with 6mm plasterboard. However, the question is whether it's strong enough?

Nothing needs to hang on that wall, but it's still about 1.5m wide.

 

[Troberg]

I would have gone with plywood. Keep it simple. If there are small differences in thickness, there's always filler. I would almost prefer 8mm plywood, because it's easier to apply filler than to remove plywood.

 

[MrDizzy]

There are 10mm OSB boards ... but if you need exactly 9mm, I see no reason why plywood wouldn't work ... a bit expensive, but that's probably what I would choose myself if 10mm OSB doesn't fit.

 

[Claes Sörmland]

Another option is a 3mm masonite board together with 6mm gypsum. The question is whether it's strong enough?

I believe in that if you glue the boards together with PVA before putting them up. Like spreading the glue over the surface.

Spackling on plywood? Does this really work over time when the wood moves with the seasons' varying relative humidity?

 

[Troberg]

I believe that if you glue the boards together with PVA before putting them up. Sort of comb the glue over the surface.

Putty on plywood? Does this really work over time when the wood moves with the seasons' different relative humidity?

I have entire walls in double plywood in my house (it has been a school...), and have not seen any issues with putty there.

Edit: Disclaimer here: This is my experience, and walls that are decades old. I don't know if it is universally applicable.

 

[Kurtivan]

The masonite board is not 9 mm but 9.6 mm, right? There is a 10 mm chipboard you can use instead?

 

[owaysis]

The masonite board is probably not 9 mm but 9.6 mm? There is 10 mm chipboard you can use instead?

It's a bit difficult to measure exactly but I think it's rather 9mm.

 

[fribygg]

9mm exterior drywall

 

[owaysis]

9mm exterior gypsum

It says you're not allowed to use it indoors?

 

[owaysis]

I can inform you that I chose to replace all the panels on that wall with 10mm particle board instead. Should be completely fine, I think, considering that among others, Älvsbyhus uses particle boards in their interior walls.