Tiling to wood/ply substrates

[Russell brown]

The sub floor is flat as anything, I took time to clean, Hoover and prime the t&g. Took time to ensure addy was spread evenly yet the hardi backer isn't flat. It's not massive dips about 2/4mm in the centre of a 2m level but I know the original floor was flat. Maybe if I mixed the addy up wetter it wouldn't of been as bad?.

 

[p4ulo]

I can only guess that's what it could be Russell?
I always screw in the fixings from one edge working towards the other, to ensure adhesive is nicely moved around and evenly distributed underneath....and I also mix it slightly wetter to allow it to "move" more.

 

[Stef]

The sub floor is flat as anything, I took time to clean, Hoover and prime the t&g. Took time to ensure addy was spread evenly yet the hardi backer isn't flat. It's not massive dips about 2/4mm in the centre of a 2m level but I know the original floor was flat. Maybe if I mixed the addy up wetter it wouldn't of been as bad?.

The Hardie should have been flat if the floor was flat.
I lay the Hardie then walk all over the board to squash it right into the adhesive & I have never had a problem.

 

[steve-tiler]

I have to admit I wasn't sure about backer boards when I first used them after always tiling onto ply. But I now always use backerboards and try not to tile to ply unless its been done by customer with correct wood and i am happy its well fixed down.