Tiling over plywood substrate

[DC Ceramic and stone]

I would never tile straight onto any timber in any form. Whether there is any bounce or not wood will move with changes in temperature. I would always recommend either Hardi backer or at the very least a construction board. Both stuck with flexible adhesive and screwed every 300mm. The tape needs to be alkaline resistant to avoid breaking down over time. In effect the floor needs to be tanked with the hardibacker to avoid water finding its way through to the timber substrate.

 

[Waluigi]

WBP Ply Circa 1990’s

In a Bathroom.

Today’s ply isn’t as good, in general.

 

[acaciaguy]

As said above use a backer board. Lovely to tile off too

 

[Boggs]

Up in one, that saves on rubble bags!!

 

[Waluigi]

8’ x 4’ sheet in tiles, on your own down the stairs..........

You can see my hopeless attempts at trying to knock them off.

That was a few years ago.