why prime the back of the ply and not the front?

[Dumbo]

Ok thanks Julian, i thought it was standard practice. If the suction rate is not controlled with cement render and plaster than you end up with a crumbly mess. I thought a longer cure gave a greater bond and strength, you know yourself if you get adhesive on your jumper it dries and crumbles away! Do you think it will matter that i primed the ply when i shouldnt have? ooops

Absolutely no problem as far as I'm concerned always prime . But as above never Tile directly to ply as I have seen many failures over the years and lots of brown grout .

 

[Flintstone]

I always prime the face of ply If I am going to tile on it, which I would prefer not to but some people I do jobs for just repeatedly use it

 

[Chris1397]

thank you all for your input.

 

[Dave]

I stopped using ply years ago .. its outdated imho..

 

[Dumbo]

I still use ply for over boarding I much prefer to other options as I think it is stronger . But I always use ditra on top .

 

[demi34]

Bal fastflex rubber adhesive no problem with plywood

 

[Dumbo]

My opinion if you have to use s2 type adhesive your background prep isn't good enough .