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Slate on 3mm Ply in the
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Dear All
My first post here and i am looking for advice.
The Customer has bought slate and is looking to to tile his kitchen. The builders have laid 3mm ... -
New TilersForums Contributor
Slate on 3mm Ply
Dear All
My first post here and i am looking for advice.
The Customer has bought slate and is looking to to tile his kitchen. The builders have laid 3mm ply for me to tile onto. The ply has been tacked down very well. I was wondering if the ply is thick enough to tile onto. The slate varies in sizes from 600mm to 200mm and is 15mm thick.
Generally i would tile onto ply of thickness 9mm.
Would i still bond the floor with sbr?
Any advice welcome.
Many thanks
JJW Tiling
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wetdec
Guest
Re: Slate on 3mm Ply
re-nail it every 150mm in both directions or it will de-laminate on you with the moisture.
Why have they been so kind what they hiding ............
..
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Re: Slate on 3mm Ply
What sub-floor is the ply fixed to ..? and what adhesive you using..?
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New TilersForums Contributor
Re: Slate on 3mm Ply
The sub floor is wooden, The customer is supplying all the materials including sealar for the slate. I havent got the job yet, so i am unsure to what they have bought.
It has to be a flexible adhesive, yes.
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Re: Slate on 3mm Ply
That thickness of ply overlay is no good for normal flexi cement adhesive......depending on the quality/ grading of the slate you will need thickbed adhesive as well....so 2 part is out of the question on thin ply for slate.....most standard adhesives will bed to 6mm and if thicker is needed for rough graded slate then a thickbed adhesive is used...
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The Following User Says Thank You to Dave For This Useful Post:
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Re: Slate on 3mm Ply
No way would i tile onto 3mm ply and i never use nails. This sounds like a disaster waiting to happen IMO.
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New TilersForums Contributor
Re: Slate on 3mm Ply
3mm does seem rather thin, It should be screwed down rather than tacked. I will see if he contacts me tmw. If it sounds like a disaster I'd rather not take it on.
Many thanks
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Re: Slate on 3mm Ply
i would feel a lot safer with backer board at 6mm glued and screwed or a thicker ply. 15mm is the recommended thickness by most adhesive manufacturers.
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New TilersForums Contributor
Re: Slate on 3mm Ply
Would you recommend an adhesive i could use.
Would Ardex s20w rapid thickbed adhesive be any good?
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Re: Slate on 3mm Ply

Originally Posted by
JJWTiling
3mm does seem rather thin, It should be screwed down rather than tacked. I will see if he contacts me tmw. If it sounds like a disaster I'd rather not take it on.
Many thanks
Wouldn't the ply split if screwed down with being so thin...I'd much prefer to tile onto 6mm backerboard......And as for adhesive i think BAL Ptb will be fine (assuming floor is sound underneath)
Last edited by monty; 25-09-2008 at 09:47 AM.
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Re: Slate on 3mm Ply

Originally Posted by
JJWTiling
Would you recommend an adhesive i could use.
Would Ardex s20w rapid thickbed adhesive be any good?
NO its not suitable for timber......
Use ardex 7001 if ardex is your prefered choice...but you need a thicker sub-floor...imo
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The Following User Says Thank You to Dave For This Useful Post:
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pjtiler
Guest
Re: Slate on 3mm Ply
go over it with 9 mm/12mm ply screwed every 200mm
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The Following User Says Thank You to pjtiler For This Useful Post:
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Re: Slate on 3mm Ply
I don't like tiling on to ply laid by someone else as I can't guarrantee the boards have been properly secured and I wouldn't like to tile on a 3mm ply, can't see it adding much rigidity/strength to the existing floor.. I wouldn't like to nail/screw it either in case I hit a water/gas pipe that might be lurking right under the floorboard. I'd be very cautious JJ
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Re: Slate on 3mm Ply
no chance i wood not do it
sorry for the pun
15mm min prefer 25mm then schluter dural matting then spf
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Re: Slate on 3mm Ply

Originally Posted by
JJWTiling
Dear All
My first post here and i am looking for advice.
The Customer has bought slate and is looking to to tile his kitchen. The builders have laid 3mm ply for me to tile onto. The ply has been tacked down very well. I was wondering if the ply is thick enough to tile onto. The slate varies in sizes from 600mm to 200mm and is 15mm thick.
Generally i would tile onto ply of thickness 9mm.
Would i still bond the floor with sbr?
Any advice welcome.
Many thanks
JJW Tiling
Theres that song, how does it go, oh yes, ..................I said no no no......................
3mm ply tacked down, do these builders really know what they are doing..................
I was sucked in by this builder who tacked down the same and I insisted on 12mm ply screwed every 6 inches. Several months later, the client called me saying tiles were cracking, and it cost me money and a days work.
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GazTech
Guest
Re: Slate on 3mm Ply

Originally Posted by
monty
Wouldn't the ply split if screwed down with being so thin...I'd much prefer to tile onto 6mm backerboard......And as for adhesive i think BAL Ptb will be fine
No it wont be fine.Minimum 15mm ply screwed at 30mm centres. Otherwise its fastflex, if floor is sound enough for it....Gaz
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wetdec
Guest
Re: Slate on 3mm Ply
Well thats me well and truelly told for working on the asumption the ply is in fact 6mm as you dont see 4,5 or 3,5 that oftern its ususlly on order. Any way I cocked up and if it is in fact 3mm you would be better beefing it up a bit more to make sure its sound enough to fix on.
My bad
tiler
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mickbull
Guest
Re: Slate on 3mm Ply
Sounds like there covering something up to me. 3mm ply,they may as well have just used hardboard!! I'd re-ply for sure, at least 12mm, better safe then sorry.
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Re: Slate on 3mm Ply

Originally Posted by
GazTech
No it wont be fine.Minimum 15mm ply screwed at 30mm centres. Otherwise its fastflex, if floor is sound enough for it....Gaz
Sorry Gaz should have put once floor made sound!
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medlar
Guest
Re: Slate on 3mm Ply
personally i would overlay the existing ply with 12mm ply screwed every 200mm,and yes mate i would use SBR as well and my choice of adhesive would also be fastflex
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The Following User Says Thank You to medlar For This Useful Post:
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Re: Slate on 3mm Ply
the ply is not suitable to tile far to thin it will delaminate it needs to be removed is it floorboards underneath ? :Pete
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The Following User Says Thank You to pjc For This Useful Post:
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GazTech
Guest
Re: Slate on 3mm Ply

Originally Posted by
medlar
personally i would overlay the existing ply with 12mm ply screwed every 200mm,and yes mate i would use SBR as well and my choice of adhesive would also be fastflex
SBR for the back and the sides of the ply, with fastflex on suitable ply, no need to prime the surface....Gaz
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The Following User Says Thank You to GazTech For This Useful Post:
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New TilersForums Contributor
Re: Slate on 3mm Ply
I think he said it was just floor boards underneath. He hasnt got back to me yet so i cant confirm.
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GazTech
Guest
Re: Slate on 3mm Ply

Originally Posted by
JJWTiling
I think he said it was just floor boards underneath. He hasnt got back to me yet so i cant confirm.
I wouldn't be happy JJW, I would want to investigate the sub-floor before I gave a professional opinion on how prepare best for this job, and with which materials will be best suited.....Gaz
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New TilersForums Contributor
Re: Slate on 3mm Ply
Cheers Gaz
I will let you know what the sub floor is, when i find out
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Re: Slate on 3mm Ply
i would remove the ply and replace with 9mm -12mm ply screwed every 150mm centres and use a flex adhesive and grout.on a 3mm ply floor if you used a high spec adhesive you would end up with stress cracks in the slate plus 7001 and fastflex is no good for bedding up.doesnt matter how much you screw the 3mm down you will always get parts of the board raisng where the screws arent like a ripple effect...in my opinion
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