Holiday Home/lodges Tiles Onto 9mm Ply

[dynamictiling]

Something I have always wondered is....what is the difference between 6mm or 9mm screwed every 100mm and 15mm or 18mm screwed every 200mm....surley the floor that is screwed every 100mm is much more solid than the ,200mm floor?

Can someone clear this up for me as it boggles me

One word movement. Easy as that. 6mm ply is thin and very flexible. It doesn't matter is there is a million screws in it or not, it will always flex. The thicker the ply the more sturdy it is and less prone to movement and flex.

 

[Martino]

I disagree... How can it move if it's glued and screwed down every 100mm?....I need hard cold evidence of the difference?

 

[J Sid]

because of what it is glued and screwed to, if that has flex in it then so will 6mm ply. The thicker the ply the stiffer it will all become

 

[Martino]

So If the floor boards or chipboard are solid there is no difference between 6mm or 18mm ply. If the 6 is glued and screwed every 100?

 

[Rizzle from the Portizzle]

ply is maid in layers 6 mm ply will be three ply witch is easy to bend the next would be 12.5 mm as i have never come across 15mm ply this will be 5 layers the next would be 18 mm ply 7 layers the next 25mm ply 9 layers each layer adds strenght a 6 mm ply will not add any strenght to a floor and will move and flex with it .12.5 mm
ply will add strenght to floor boards or chip board .but not to joist fixing in one layer .the ply should be wbp and should be red i coulor .but times have moved on and there are much better products to use today .if you see all advice as putting you down you need to ask your self why ?

 

[dynamictiling]

I disagree... How can it move if it's glued and screwed down every 100mm?....I need hard cold evidence of the difference?

Disagree with me all you like. The bottom line is this, you tile a floor with 6mm ply (regardless of how many screws you use!)
You Have problems with it. Your customer wants the floor fixed, they make a claim against you. Your insurance company sends an auditor out to access the job. The outcome of the audit is that you have used 6mm ply, against British standards. Your insurance class that as 'bad workmanship'. Your claim gets rejected. You are now liable to fix the floor or pay for someone else to fix your floor. Disagree with me all you like but for your own wallet and reputation don't use 6mm ply. End of..

 

[J Sid]

why would you want to use any thickness of ply to cover floor boards or chipboard floor if they are both stable and solid when there are so may better products out the to prep these floors ready to take tiles?

 

[Martino]

So because the insurance company says we can't use certain ply then we don't....it won't be long and no ply is allowed with insurance company's.... Don't get me wrong I wouldn't use 6mm ply on my bathroom floor I would use hardi board....but its not about me or my methods.

I have personally never seen a failed floor on 6mm ply that has been fixed correctly....I have seen tiles straight onto chipboard and also floor boards lol

 

[dynamictiling]

It isn't insurance company's that set the rules, it is British standards. Personally I wouldn't touch a chipboard floor, even using sbr bonding the adhesive doesn't take to it.

Going directly onto floor boards is very risky, again due to movement. In older houses especially. I am also not keen going directly onto green chipboard found in new houses either.

 

[Bill]

It isn't insurance company's that set the rules, it is British standards. Personally I wouldn't touch a chipboard floor, even using sbr bonding the adhesive doesn't take to it.

Going directly onto floor boards is very risky, again due to movement. In older houses especially. I am also not keen going directly onto green chipboard found in new houses either.

Actually, British Standards don't set the rules. The insurance companies set their own - they use a trade industry as a guidance.

Before matting, we used to tile onto floorboards with a specialist adhesive - it can be done it is just that technology has moved on so things can be fixed quicker and unfortunately, with less skill.

That is probably the reason why all tiles were small compared to what we use today.