conservatory

[MIKE1]

Hi about to start my 3rd job ( for a mate this time )a conservatory floor then into the kitchen at a latter date. The floor area is 18mm ply with a small amount of bounce/flex, am going to put more screws in at 400mm centres to help , I will acrylic primer the floor then what would you recommend for adhesive and grout to cut down risk of any cracking ? Any advice would be appreciated have only done a bathroom and kitchen before which were totally different sized jobs but both came out v.well so this is my 1st floor.

[Dave]

I think you need to get that floor strengthened first before tiling....18mm flooring alone really isn't strong enough to tile too...is that straight onto joists..?

[Thespanishtiler]

I would lift the flooring and add some strength to the joists with noggins and probably some additional pillars, relay the boards, then ply it over or hb boards/no more ply. use spf and flexi grout also think about an expansion joint at the threshold if it runs through to a conc floor.

[monty]

I would lift the flooring and add some strength to the joists with noggins and probably some additional pillars, relay the boards, then ply it over or hb boards/no more ply. use spf and flexi grout also think about an expansion joint at the threshold if it runs through to a conc floor.

Instead of relaying the 18 mm and then boarding that (twice the work) couldn't you just replace with 25 mm ply?

[MIKE1]

yes it is straight onto joists,have you ever used a material called pecilastic ? I think you spread a thin layer of adh. on floor then put this material on top,leave to dry and then tile on top of that, it is supposed to help with movement on wooden floors.

[Dave]

yes it is straight onto joists,have you ever used a material called pecilastic ? I think you spread a thin layer of adh. on floor then put this material on top,leave to dry and then tile on top of that, it is supposed to help with movement on wooden floors.

It is for lateral movement and not deflection....