Porcelain Plywood + Flexible adhesive or Plywood + Ditra matting - TilersForums.com

[Dumbo]

Main thing ensure al floor boards are secured first ,then ply ,i did a job similar,the joinerpulled up the boards ,then 18 mm ply onto joists ,then ditra ,big area do it once properly ,

If you do as @3_fall you do not at any point get a continuous joint coming from the joists to the to surface

 

[Marty M]

Only timber floor I have ever had a failure on was floorboards over layed with 6mm Hardie.
You end up with basically 3 joints in around 5 inches and that’s where the tiles cracked.
I always take them up now.

Thanks for the reply @Boggs . Yes I was told the substrate floor needs to be a decent thickness. 6mm defo too thin

 

[Marty M]

Main thing ensure al floor boards are secured first ,then ply ,i did a job similar,the joinerpulled up the boards ,then 18 mm ply onto joists ,then ditra ,big area do it once properly ,

Cheers for the reply. I now have two people on here, yourself and 3_fall who have recommended pulling up the floor boards. Looks like this is the way to go. Regards to the Ditra, any particular brand/type of adhesive you use for the Ditra to ply and then tile to Ditra?

 

[Andy Rhodes]

I'd use 12 mm Hardiebacker board over top of your floorboards but ensure that the floorboard aren't loose or rocking then screw backer board every 150 mm or 6 inch in old money if you want to be over cautious screw 10 mm centres use yellow zinc screw though as they don't corrode apparently