Overboarding floor panels? - Tile Advice

[Ingram]

So even taking up the chipboard. Re boarding with 18mm ply and tiling onto ply with BAL Silgle part fast flex is still not good enough? Needs 6mm Hardie??

 

[Time's Ran Out]

Take old tiles up, leave but clean the chipboard floor, prime and fix (adhesive under and mechanical fixings) 6mm Hardie backer boards across joints. Tape Hardie joints and your good to go.
The only issue would occur if chipboard underneath got wet!
Also you have to be sure that the chipboard is well fixed, and no deflection.

 

[Boxtiling]

The bal fast flex should do the job if you've not already done it

 

[Time's Ran Out]

The bal fast flex should do the job if you've not already done it

And what preparation to the chipboard substrate?

 

[Dumbo]

And what preparation to the chipboard substrate?

Unless it's changed tj bal used to say this was OK for chipboard although I must say I wouldn't do it .

 

[Time's Ran Out]

Unless it's changed tj bal used to say this was OK for chipboard although I must say I wouldn't do it .

I think that's what was established in the thread then @Boxtiling seems to be going the direct flexible adhesive route!
When I've read the technical info on manufacturers packaging they've always left the decision to the installer by providing the relevant Bs 5385 code of practice. Usually a get out of jail card when the floor cracks through deflection!

 

[JMC tiling]

First thing you need to do is suss out why its failed. If there is a deflection issue then tiling the floor regardless of what substrate you use may well be a big no no and suggest something like a kerndean. Otherwise there's no way i'm using anything other then a cement board over the top. I prefer NMP glued and screwed.

 

[Boxtiling]

With the 18mm ply but 12mm ply would be enough

 

[Flintstone]

I never understand boarding a floor with 18mm ply when a 6mm cement board is superior

 

[Boxtiling]

A can honestly say that in the 16 years a have been tiling the a have only had 2 floors that a have had to lift and relay due to much deflection on the sub floor which a told the client at the time but got told do it the now and we will see how long it last and the cements are a bit pricey in Scotland

 

[Flintstone]

surely not compared to 18mm wbp ply wood and all that's involved in picking that up and fitting it

 

[Boxtiling]

To be fair a just advise the clients when they are getting the works done in what materials the tile shops tend to rob people if your not there with them and you no and i no we don't have the time to go way clients sometimes

 

[Dumbo]

I think that's what was established in the thread then @Boxtiling seems to be going the direct flexible adhesive route!
When I've read the technical info on manufacturers packaging they've always left the decision to the installer by providing the relevant Bs 5385 code of practice. Usually a get out of jail card when the floor cracks through deflection!

To be fair a just advise the clients when they are getting the works done in what materials the tile shops tend to rob people if your not there with them and you no and i no we don't have the time to go way clients sometimes

I don't have tested to hold clients hands in Tile shops . Where would it end

 

[Boxtiling]

A went to tile shop before the holidays needed 5 bags of floor adhesive and he was wanting to charge me £20 a bag for palace floor adhesive a just walked out the door and drove half an hour to my usual tile shop and got it for £10 a bag Mapei as well

 

[Flintstone]

10 quid a bag?