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Discuss Suspended Timber Floor Tile Prep in the Tiling Forum | Tile Advice area at TilersForums.com

Deyna

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To be honest I've spent the last couple of nights poking and prodding and even with the extra walls its just not good enough...

View media item 16018
Even with overboarding again I don't think this can be eliminated or at least reduced to an acceptable level.
 
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Deyna

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Back again...the things you do for love :)

I did a slightly more visual test by running some building line over a specific joist and put a 3mm shim for reference. The building line was 2mm at most.

So while the the movement looks bad to me (I really have no point of reference though), the visible deflection cannot be more than 1.5mm as at no point does the building line rise above the shim but you can see clear air underneath.

So if the allowable deflection over a 3ft span is 2.5mm (36/360) then the L value is more like L/720 observed.

If someone were tiling a standard bathroom i.e. 8x2 joists, 10ft span and 16"OC then the allowable deflection is 120/360 which is about 8mm. I cannot imagine doing the same jump test on this setup would yield zero movement.

I'm still feel like some extra noggins or doubling up with the left over timber would provide some more assurances though I just dont feel like it would further reduce what I'm observing.

View media item 16019
 

pjc

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Put a full glass of water till its convex. Then jump on the floor. if it OK the floor will be dry. That's the old way.
 

Deyna

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I did however spill my beer last night after foolishly putting it on the floor. Didnt even have a sip :/
 
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What you need to ask yourself Denya is can you live with the 1.5 mm deflection, because if you can you answered your question you asked us all & all this has been possible because of all the good information you have provided us with
 

Deyna

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@Andy Rhodes Thanks fella, you guys have helped massively. Like I said its hard not having a point of reference for what is acceptable. I feel more confident given the additional steps I took on everyones advice and I am happy to take this risk now. The overboarding with cement board removed any flex in the ply as well.
 

Deyna

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So heres my progress...

Had to use the levelling clips due to slight bend in the tiles would not have managed to lay without lippage so something to be mindful of when evaluating plank tiles next time.

Unfortunately I think they are expensive junk (the clips) but in this case a necessary evil to get a good finish. I found that probably 80% of them snapped incorrectly so I'm using my multitool with to grind them down to where they should be. Obviously this is due excess adhesive squeezing up around the clip when putting the tile in place but it seems difficult to find a balance without leaving voids around the clip areas. Didnt feel like I had too much addy though so I will need to find a solution for the extension as I wont have the patience to make good such a large area!

Again, thanks guys for the help. Had some good fortune with end of tile landing right on the pipes so saved me taking the rad off :)

WhatsApp Image 2019-04-14 at 12.05.06.jpeg
 

Deyna

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No! I'll admit it looks like it doesnt it. 6mm Cement board.

Unfortunately it was a case of local availability. If there is a better product please let me know I would rather not use these again.
 

Tom Astley

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No! I'll admit it looks like it doesnt it. 6mm Cement board.

Unfortunately it was a case of local availability. If there is a better product please let me know I would rather not use these again.
Just buy them from ebay..... you have used the lash clip set that have curved bases.
 

Deyna

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Ye I know what I bought. Ebay has a lot of junk so is there a better design I should be looking for? Anything similar to this will just have the same problems. Ideally a system that is re-usable given the area I need to work on...
 

Tom Astley

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Ye I know what I bought. Ebay has a lot of junk so is there a better design I should be looking for? Anything similar to this will just have the same problems. Ideally a system that is re-usable given the area I need to work on...
you can only reuse the wedges......
 

Deyna

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Unfortunately I wont trust those wedge style ones again. Long evening ahead :D
 

Deyna

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Fair enough...if you care to expand I would be more than happy to learn!

Too much addy? Bed too small (10mm + back buttered)? Laying the tile incorrectly? Not kicking them straight?

Why would a similar design work any better?
 

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