25mm plywood

[On one]

Hi All
Went to see this 30m2 kitchen floor job today for a builder,can you see any problems with the spec..

25mm plywood onto 75mm x 50mm treated timbers @400mm centres,supported around all the edges and timbers are screwed down onto the concrete sub floor.
Should a standard flexible adh & grout be ok?

 

[Spud]

i wouldnt recommend anything but 2 part for direct bonding onto ply wood but there are plenty that would use a spf

 

[White Room]

What tiles are you fixing.....

 

[Bubblecraft]

If the ply was treated in SPR before fitting ie: underside & edges, I don't see any problems in using a SPF. If ply has not been primed before fitting, I'd use a 2 part

 

[On one]

What tiles are you fixing.....

Sorry, 600x300 porcelain.

 

[On one]

If the ply was treated in SPR before fitting ie: underside & edges, I don't see any problems in using a SPF. If ply has not been primed before fitting, I'd use a 2 part

Nice reminder! Ply has been cut but has not been fitted as sparkys are running cables around/under at the minute.

 

[On one]

After looking into it further it seems that a standard flexy is not the way to go.So would you chose Bal Fastflex or Mapei ultraflex? I have used the Fastflex before but not the Ultraflex, the Fastflex price is a bit eyewatering tho!!!!!

 

[Peter]

Always use a two part rubber crumb when ply is directly onto joists. SPF is only suitable with over boarding IMO.

 

[widler]

could you not use a thinner ply then 6mm or 12mm hardiebacker ?

 

[Brian the Tile]

never use 6mm ply you might as well put cardboard down 6mm is just not thick enough

 

[StevieBoy]

For me, I would always use a 2 part flexible, rubber type adhesive - cheap as chips at Topp's

 

[widler]

never use 6mm ply you might as well put cardboard down 6mm is just not thick enough

if this was aimed at me brian,read it again,i said use a thinner ply(he said 25mm,i was thinking a tad thinner if the height was a problem,or keep 25mm,then hardi if not a problem with height)then 6mm or 12mm HARDIEBACKER,which is not ply :smilewinkgrin:

 

[DHTiling]

I am not a lover of tiling to ply no matter what adhesive is used , cement boards are on the market for a reason , so I use them. But!! If I had to , then s2 it has to be.


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[On one]

could you not use a thinner ply then 6mm or 12mm hardiebacker ?

Fraid not. Builder already has cut and loose fitted 25mm ply. He choose 25mm ply so that the levels matched an adjoining utility room tiled floor that he wanted me to overtile. But I have condemned the utility room tiled floor because you can lift the tiles up with your fingers! (tiles layed on a 25mm very weak mix of sand and cement)
If he had contacted me sooner it could have been 18mm ply,12mm Hardi and then an S1 adh

 

[steve187]

Fastflex is now SPF, but is expensive, Ultra do a 2 part flexi here - http://www.ultratileadhesives.co.uk/cmsUploads/product/files/Ultra ProFlex 2part.pdf

i used to use this a lot its very good and was always cheaper than Fastflex