is 6mm ply suitable?

[grumpygrouter]

thanks for all the comments, my original plan is to make sure current floor is sound then put 6mm hardi down(best price from ctd for the usual 1500x900 sheets) not sure why someone would advise putting plywood down if they knew much about the job, ive spoke to customer again and explained the pros and cons and was told that they would be happy for 11mm hardwood? think i might be flogging a dead horse with this one, i suppose some would say if thats what the customer wants then ill do it, but in my mind i just know it will be a waste of time! i suppoose i will find out shortly if i have persuaded them!

???????

 

[White Room]

11mm hardwood? That'll cost a furtune:yikes:

 

[marbleman]

If the floor is stable why are you not using ditra matting its one of the best decoupling systems on the market and does not increase the height issues
Regards
marbleman

 

[grumpygrouter]

If the floor is stable why are you not using ditra matting its one of the best decoupling systems on the market and does not increase the height issues
Regards
marbleman

Personal opinion this, but one of the issues with tiling straight on to chipboard is the potential for the chips in the board to break up giving the potential for delamination of the tiled surface. Ditra is still only glued to the chipboard so has potentially the same problem. Hardie on the other hand is also mechanically fixed giving more protection from the break up potential of the chipboard.

 

[doug boardley]

I agree Grumps, but again, that's only my personal opinion

 

[Daz]

Ditra is 3mm in thickness and as Grumps and Dougy say is only fixed with addy. Hardie is an extra 3mm (negligible) and fixed mechanically and with addy. Both are just decoupling membranes - I know which one I would choose

 

[marbleman]

well Grumpy lets get into this one , delamination of ditra matting off timber surface hmmmmm used this product for 15 years and not once has it failed maybe its down to what products are used to install, now if the chipboard breaks up then that tells me there is not enough supports in the floor but then i have only seen chipboard failure when water has been the main factor, I thing its a bad idea to say that ditra has the same problem if you install to chipboard direct YOUR WRONG
regards
marbleman
Maybe you need to contact schluter systems as you seem not know enough about the product, because of your remarks

 

[doug boardley]

if Grumps is thinking along the same lines as me marbleman, it's the chipboard that we feel could delaminate, not the ditra (a very good product!!) and as we both expressed, this was a personal opinion

 

[grumpygrouter]

well Grumpy lets get into this one , delamination of ditra matting off timber surface hmmmmm used this product for 15 years and not once has it failed maybe its down to what products are used to install, now if the chipboard breaks up then that tells me there is not enough supports in the floor but then i have only seen chipboard failure when water has been the main factor, I thing its a bad idea to say that ditra has the same problem if you install to chipboard direct YOUR WRONG
regards
marbleman
Maybe you need to contact schluter systems as you seem not know enough about the product, because of your remarks

Don't quite know how you have interpreted my remarks, but as I stressed right at the beginning of my post, that was a personal opinion of mine, based on the logic of potential failure of chipboard. I have used ditra in the past and it is an excellent product, I have discussed the product directly with Schluter support in the past and i also have full information about the product in PDF format on my computer, so I do know plenty about the product. I have in fact recommended it's use in these forums, dozens if not hundreds times. Neither did I say it was a BAD IDEA to install it on chipboard, only gave my personal preference to the OP of the thread. To say I am right or wrong is really irrelevant but you seem to be looking for some sort of confrontation, why is that, because I raised a question which had the possibility of contradicting your advice?

The OP is free to make his own decisions as to which way he goes after reading the responses to his question. He may well go down the route you are suggesting or he may take a different course, that is up to him.

I am not on here to have arguments with other members, just to offer advice as I see it. if you have an issue with that then I am afraid that is your problem.