Hey, I was just wanting to run this by you guys and get your opinion and see if what I am about to do is ok.

Ive an en suite floor to do on Thursday and the existing chipboard floor that's down at the minute is rotten and tatty and needs replacing really to do a proper job. So I am going to rip up the old and fit new 25mm marine ply through out. Then I will use an uncoupling matting with flexible addy and grout. The tiles are Ceramic so are not a problem I just wanted to see if what I am going to do is good enough regarding the ply and matting to reduce/stop movement in the floor?

As long as deflection is at a minimum then ye.. but maybe fix the mat down with an S2 adhesive for a true belt/braces job.. then normal flexi rapid set on top.(S1)

Cheers Dave. I was going to use a S2 adhesive for both. Thanks again mate.