i am laying porcelain tiles using kerriquick and latex , i have boards screwed onto floorboards at 100m spaces, these are 12mm boards and are clean and dry, do i prime them and what with , i normally use pva , but have not used mapei before , please advise
thanks
gingergeordie

What sort of boards have you fixed down ?

plywood boards

There'll probably be a pro online soon to confirm or otherwise, but as far as I am aware, you should prime the rear and sides of the ply with a synthetic primer, such as Everbuild SBR Bond (available from Tradetiler)

do you mean i should have primed the underneath of the boards before i screwed them down , this is no longer an option as kitchen has been fitted , please define rear and sides , of boards,

As jimbob says, you should have sealed the underside and sides of the boards, this is to prevent moisture from getting to the board and distorting them.

thanks alan , i can see what you mean , i can only hope there is enough airflow under the floorboards to keep the moisture to a minimum , the undersides of the floorboards were completly dry when i was laying new pipework under the floor , but will i need to prime the plywood before laying the tiles

Fingers croosed you won't have any problems, when Keraquick there's no need to prime the ply first.

cheers alan this was my first post , and i have found this forum really helpful again thanks