How to waterproof floor

[superflo]

Hi - Im in the middle of refurbing my daughters ensuite (Jack and Jill), I don't plan to fit a wet room, but when you have teenage daughters im as well making it as waterproof as I can. I have removed all the plasterboard on the walls and replacing with Kerdi board, and I will seal appropriately around the shower area, I plan to replace the chipboard flooring with 18mm Marine Ply. I was going to use hardie backer board on top of the ply, then tile, but Im not sure that give me a good waterproof seal for the floor, are there any suggestions in what is best to waterproof the plywood floor? thanks

 

[Dave]

Hi - Im in the middle of refurbing my daughters ensuite (Jack and Jill), I don't plan to fit a wet room, but when you have teenage daughters im as well making it as waterproof as I can. I have removed all the plasterboard on the walls and replacing with Kerdi board, and I will seal appropriately around the shower area, I plan to replace the chipboard flooring with 18mm Marine Ply. I was going to use hardie backer board on top of the ply, then tile, but Im not sure that give me a good waterproof seal for the floor, are there any suggestions in what is best to waterproof the plywood floor? thanks

Ditra membrane the floor and kerdi joint the joints. That will suffice but also at least a 100mm upstand around the perimeter as well for over kill. But tbh A backer board will also be fine for general water overspill wetting. ( Not wetroom use ).

 

[superflo]

Ditra membrane the floor and kerdi joint the joints. That will suffice but also at least a 100mm upstand around the perimeter as well for over kill. But tbh A backer board will also be fine for general water overspill wetting. ( Not wetroom use ).

thanks Dave, I will probably go for the hardie backer board for the floor, would it be OK to hardie backer 6mm the whole floor, then fit the shower tray on top of the backer board., wasn't sure if I had to fit the shower tray over the ply and hardie backer around the tray. cheers

 

[Dave]

thanks Dave, I will probably go for the hardie backer board for the floor, would it be OK to hardie backer 6mm the whole floor, then fit the shower tray on top of the backer board., wasn't sure if I had to fit the shower tray over the ply and hardie backer around the tray. cheers

Nah its fine over. 👍. Use a suitable flexible adhesive

 

[superflo]

Nah its fine over. 👍. Use a suitable flexible adhesive

thanks Dave, sorry to be a nuisance, one last thing, would you recommend me applying primer, tanking liquid etc.. to the
backer board, to form some level of waterproof as belt and braces. thanks C

 

[Dave]

thanks Dave, sorry to be a nuisance, one last thing, would you recommend me applying primer, tanking liquid etc.. to the
backer board, to form some level of waterproof as belt and braces. thanks C

Yes you can. Check with supplier for suitable products they have.