Discuss Deflection issue with No More Ply down in the DIY Tiling Forum area at TilersForums.com.

Andy Allen

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Depending how much your floor is bouncing.....and less face it non of us has seen it so can't really give an opinion on that.....however you say you have had a tiler round to have a look . So all I can say is using bal single part fast flex and bal wide joint grout with GT1 add mix would certainly allow for some movement and as your using a porcelain floor tiles and not some cheap bct rubbish then you might get away with it ....just remember to use a solid bed..minimum 10 mm trowel and back skim the tile.......
 
S

Stef

So I really have three options: 1) The correct way - rip up the NPM which will probably also destroy the floorboards. Fix/strengthen the joists so no deflection and lay 12/18mm ply floor, overboard with NPM or Hardiebacker. Tile. Expensive, disruptive and will make me cry.
2) The risky adhesive option - bearing in mind that the deflection is minimal a very flexible adhesive might resolve the problem. Only time will tell. 2 or 3 tiles would be affected. One commenter suggests he doesn't think i have a deflection problem in such a small room.
3) The raised floor option - Ply or hardiebacker. Adds 2 cm to the height of the floor. Will it definitely stop bounce after all that effort?

I hope the answer comes to me in the morning...night all. Thanks for weighing in.
Do you have a self levelling laser?
If you do then sit it in the middle of the room & mark it on the wall, stand beside it & get someone to mark the wall again & that will show you exactly how much movement you have in your floor.
I think you may be over thinking this floor too much as you always do get slight movement in a floor, it's trying to assess how much movement you do have, it's all well & good us sitting here trying to offer advise but we can't see the floor so it's a bit of a guessing game.
 

Dan

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Depending how much your floor is bouncing.....and less face it non of us has seen it so can't really give an opinion on that.....however you say you have had a tiler round to have a look . So all I can say is using bal single part fast flex and bal wide joint grout with GT1 add mix would certainly allow for some movement and as your using a porcelain floor tiles and not some cheap bct rubbish then you might get away with it ....just remember to use a solid bed..minimum 10 mm trowel and back skim the tile.......
You won't need to back skim with fast flex I don't think. Unless things have changed as I think it's one part now isn't it?
 

Andy Allen

TF
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Ahh okay. Thought it was squishy enough. Used to need the fast flex trowel with ribs on the end to ensure a flat bed before even sticking to it.

Do you still need that expensive trowel you only used once in a blue moon?
Not really....I use fast flex a lot on wooden substrate. I just use 10mm notch trowel and back skim the tile. as long as you achieve full coverage that's the main issue.
 

Andy Allen

TF
Esteemed
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Gloucester
Could you still tile your curtains with it if you wanted to now it's single part? I used to need to throw away my work trousers every bloody time it went near it let alone used

Not as bad.....but still gets everwhere and a nightmare to remove....gloves are a must.
 

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Deflection issue with No More Ply down
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