6mm ply and warm-up underfloor heating-best flexi tile adhesive??

[davy_G]

the floor temp shouldn't change that much it has 100mm kingspan under-it. so its already insualted

You have to heat the screed before the kingspan has any effect. ££££3

 

[grumpygrouter]

You will be applying heat directlty from the heat mat to 6mm ply! firstly this restricts the amount of power you can have in you heating system and secondly, ply is thermally unstable and will expand and contract a lot more than cement based thermal insulating boards, resulting in failure of your tiling surface!

 

[Hayden Goy]

You will be applying heat directlty from the heat mat to 6mm ply! firstly this restricts the amount of power you can have in you heating system and secondly, ply is thermally unstable and will expand and contract a lot more than cement based thermal insulating boards, resulting in failure of your tiling surface!

But the floor is to be primed and 5-6 tiles have said this is ok?

 

[Daz]

You will be applying heat directlty from the heat mat to 6mm ply! firstly this restricts the amount of power you can have in you heating system and secondly, ply is thermally unstable and will expand and contract a lot more than cement based thermal insulating boards, resulting in failure of your tiling surface!

As per Grumpy.

6mm ply will not offer much in the way of strengthening or insulation so seems a very strange choice.
What wattage mat / wire have you laid? You should not apply anything over 100 watts onto ply (fire hazard) which will not provide a massive amount of heat.

Take everyones advice and do the job properly mate.

Good luck.

 

[grumpygrouter]

But the floor is to be primed and 5-6 tiles have said this is ok?

Not sure what you think priming will do but if you are happy with the advice of your 5 or 6 tilers then take it. I personally would not tile your floor in the way it has been prepared...you would be knocking on my door in a very short space of time asking me to repair the damage that will be caused by it.

Good luck, which ever way you chose to go. I will be delighted for you if it turns out ok with the prep the way it is.

 

[theyomper]

This is what happens when you use ply and underfloor heating. Take the good advice already given and you will have a proper job.
Check out my other thread on here....'Another one for the Rogues Gallery'
http://www.tilersforums.com/tiling-forum/22369-another-one-rogues-gallery.html

 

[Hayden Goy]

Not sure what you think priming will do but if you are happy with the advice of your 5 or 6 tilers then take it. I personally would not tile your floor in the way it has been prepared...you would be knocking on my door in a very short space of time asking me to repair the damage that will be caused by it.

Good luck, which ever way you chose to go. I will be delighted for you if it turns out ok with the prep the way it is.

is there anything i can put on top thats thin? theres no way of getting the boards up now

 

[Hayden Goy]

As per Grumpy.

6mm ply will not offer much in the way of strengthening or insulation so seems a very strange choice.
What wattage mat / wire have you laid? You should not apply anything over 100 watts onto ply (fire hazard) which will not provide a massive amount of heat.

Take everyones advice and do the job properly mate.

Good luck.

hi its a dws 800 wire warm-up. its not laid yet

 

[davy_G]

HG, you have had the advice of 5-6 tilers on here and we would all lift the ply.
No such word as cant...just wont. Get yer kango out, ditch the ply, lay insulation and make a job of it for yourself and the customer.

I know your not liking what we say but you can still sort it out, better than a call back in 6 months to rip it all up!

 

[grumpygrouter]

is there anything i can put on top thats thin? theres no way of getting the boards up now

What is sitting on top of the boards now?