Dot And Dab - Will It Have To Come Up?

[jaycy99]

Was the floor levellish once ply was down

Hi, there was some talk from the contractor about the level being out and needing building up.

JC

 

[jaycy99]

I would remove and glue and screw hardie backer boards that if they ceramic or Porcelain...natural stone would need a ditra matting.

The ply is screwed every 6 inches - does it need an extra layer?

JC

 

[jaycy99]

Take them up and cover the ply with uncoupling membrane or over board and retile

hi, there's ply screwed down every 6 inches on top of well nailed and screwed down floorboards - is another layer necessary?

JC

 

[J Sid]

hi, there's ply screwed down every 6 inches on top of well nailed and screwed down floorboards - is another layer necessary?

JC

If the ply is screwed and there is no deflection on the floor then I would use an uncoupling membrane, my choice is Ditra, then tile.

 

[StevieBoy]

Are we talking plywood on top of chipboard?

 

[jaycy99]

Are we talking plywood on top of chipboard?

No, it's a Victorian house and its plywood on top of the existing floorboards.

 

[jaycy99]

Hi,
Thanks for all replies so far .

I'm not worried about the underfloor - well screwed down ply on top of well screwed and nailed existing floorboards. It's the fact that the tiles the tiles are not well supported that worries me. So I was asking if there is any possibility at all of rescuing the existing tiling without taking it up.

I did phone Mapei for some advice and they mentioned (but not recommended) the possibility of injecting an epoxy resin type adhesive between the not yet grouted tiles to bridge the gap between the flooring and the back of the tiles. This would at least provide support for all of the tile edges.

If the tiles have to come up and they come up undamaged , is there any easy way to clean them up for reuse?


JC

 

[Old Mod]

For me, if u start injecting products between the tiles you're possibly going to make things worse.
What I mean is that there's still no absolute gaurantee it'll work and resin will definitely make everything unusable again, tiles and substrate (ply)
It's a pretty safe bet that as it is you are going to face continual problems with breaking and lifting tiles.
So personally I think the decision is either do u try and bodge it and hope it lasts.
Or do you just wipe your mouth and put it right and not be bothered by it again!

What is the thickness of the ply?

As far as using the old tiles, it will be possible if they lift without breaking.
You would probably find that u would have to grind the adhesive on the backs off!
It's a nasty, dusty, and labourious job, but can be done.

 

[StevieBoy]

Hi,
Thanks for all replies so far .

I'm not worried about the underfloor - well screwed down ply on top of well screwed and nailed existing floorboards. It's the fact that the tiles the tiles are not well supported that worries me. So I was asking if there is any possibility at all of rescuing the existing tiling without taking it up.

I did phone Mapei for some advice and they mentioned (but not recommended) the possibility of injecting an epoxy resin type adhesive between the not yet grouted tiles to bridge the gap between the flooring and the back of the tiles. This would at least provide support for all of the tile edges.

If the tiles have to come up and they come up undamaged , is there any easy way to clean them up for reuse?


JC

I'm with 3-fall on this one, you don't want to be injecting stuff under the tiles etc, at least if you take them up you will have peace of mind if they are then laid properly.

It would depend how long they have been down as to how easy the adhesive comes off the back of them. If they have been done recently, you may be lucky and be able to remove the adhesive with some elbow grease and a very sharp scraper.

Good Luck!

 

[jaycy99]

Hi all and thanks so far,

Might have been wrong about dot and dab - I've taken up a couple of tiles to get at the broken one and rather than dot and dab it looks like "paste all of the tile except for the edges and corners" if that makes sense.

I don't suppose it makes any difference to the advice so far but here's a couple of pictures.......

Btw, they weren't too difficult to get up and most of the adhesive was left stuck to the floor.