Laying tiles on wooden floor with G-flex

[metereater]

yea sorry brain dead moment, i ment plywood idealy marine plywood costs a bit more but has already been treated, screwing it down every 300ml not just around the sides but threw the entire floor.

sorry for confusion.

 

[Rob Z]

Hello again, nice diagram!

It looks like the unsupported span of the joists is only about 6.5 feet, and with the size and spacing of the joists that should be a solid floor.

I'm not familiar with the product that you mentioned in your first post, but a product such as Schluter Ditra would be perfectly fine in this application, installed directly over the subfloor (just the plywood, not the hardboard).

BTW, how thick is the plywood on the joists? We would use 5/8" tonge and groove minimum here. 3/4" would be better.

 

[DHTiling]

G-flex is basicly plastic ply.. IMO it does not add strength and will not directly replace plywood..


BS5385 minimum for a plywood sub-floor overboard is 15mm, this is not only for deflection but also for moisture ingression stability .

There are better products on the market if the floor is solid and i would be inclined to use hardibacker.. never use hardboard or thin ply..

 

[scoobysnax]

Sounds like good news then. There isn't any plywood down on the floor though. Not sure if I explained myself correctly, but there is the joists, to which is screwed the tongue and groove floor boards, which are I believe 3/4". A few years back, I put down the hardboard onto which I applied the self-adhesive vinyl 'planks'. Basically they are made to look and feel like real wood planks.

My plan is to lift the vinyl planks and hardboard before applying the G-flex directly to the tongue and groove boards.

This Schluter Ditra stuff, do you lay the floor tiles straight on top of it?

 

[Rob Z]

Hello again,

Yes, Ditra is a membrane with is bonded directly to the substrate, and then tile is set directly over the Ditra.

I missed the part about the T&G flooring. In my opinion, it would be a superior installation with 3/4" plywood on the joists, rather than T&G flooring.

I'm not sure that Schluter allows for Ditra to be installed over T&G flooring.

 

[DHTiling]

Sounds like good news then. There isn't any plywood down on the floor though. Not sure if I explained myself correctly, but there is the joists, to which is screwed the tongue and groove floor boards, which are I believe 3/4". A few years back, I put down the hardboard onto which I applied the self-adhesive vinyl 'planks'. Basically they are made to look and feel like real wood planks.

My plan is to lift the vinyl planks and hardboard before applying the G-flex directly to the tongue and groove boards.

This Schluter Ditra stuff, do you lay the floor tiles straight on top of it?

Again, not something i would advise..

 

[CJ CERAMICS]

just been shown this g mat in my suppliers it states that it is for newly laid floors and will prevent cracking etc etc CANT see how it is going to work as there is no solidity at all in the product........

 

[grumpygrouter]

just been shown this g mat in my suppliers it states that it is for newly laid floors and will prevent cracking etc etc CANT see how it is going to work as there is no solidity at all in the product........

As far as I can see it is nothing more than a decoupling memebrane and will only work for lateral movement. Not something I would consider using myself.