Gluing together 6mm gypsum and Masonite, Strong?

[kamo]

Hi,

Long story short, I need a plasterboard that is 9mm thick. Since this doesn't seem to exist anymore, I thought I would take a 6mm plasterboard and glue a 3mm masonite on top of it.

I was thinking of using regular mounting adhesive.

The question is: Will this be a strong enough construction to set tiles on?

The issue is that I was replacing tiles in the kitchen and the entire plasterboard came off when I removed the old tiles. Under the plasterboard, which was 9 mm thick, there is a 6 mm plywood.

I want a new board that is 9 mm thick so that it matches well with the seam between the new and the old.

Well, I ended up telling a long story anyway, oh well.

Regards,

Kalle M

 

[jon_h]

Yes, it will be strong enough. Place the plasterboard facing outwards.

Otherwise, there is 9mm ceiling plasterboard.

Edit: Sorry, I was thinking of 9 mm outdoor plasterboard I realized. You should not use that.

 

[Mikael_L]

If all the boards are glued to each other (6 mm plywood + 3 mm masonite + 6 mm plaster), it seems to become a strong construction overall. I would have dared...

But keep in mind that 3mm masonite + 6 mm plaster becomes more than 9 mm if you glue them.

 

[Fein]

also keep in mind that regular plasterboards have chamfers on the long sides for jointing and the edge is about 9mm. I did the same as you when I tore down our kitchen.

 

[Fredrik.engdahl]

I believe there is fire-resistant plasterboard that is 9mm thick.