Help!: two types of floor

[flawless finish]

hi, geoff from flawless finish here, can anyone help, i am tiling a large kitchen area which is level and is half floor boards and half concrete. i've no problem boarding over the floorboards with 12mm but how do i tackle the concrete, do i screw down 12mm onto concrete to keep all level?

[pjc]

stick it down with the tile adhesive don't screw it on the concrete in fact stick on the floorboards to and then screw it but not the concrete or better still use backerboards

[flawless finish]

thanks, never used hb boards, are they garaunteed good adhesion to concrete? does floor require pre-treatment? what addy do you use for this?

[pjc]

before you need to prime floorboards and screw them first but thats about all you need and use spf rapid to put the boards or ply down i use the pci primer PCI Primer 303 and its a good idea to have a joint where the two floors meet

[TF Ed]

hi

following on from what pjc has wrote...

dont forget to stagger the boards in a brick bond pattern and leave a 2mm gap between the boards and fill with spf and then compress fibre tape over the joints.

use corrosive resistant screws ie brass or stainless steel etc..and try to get some screws into the joists where possible for extra strength but watch out for pipes and wires mate!!

as pjc mentioned, fit an expansion trim where the 2 substrates join. schluter will send you out examples if you ring then up and ask nicely

good luck, i'm sure you'll have no worries mate
Ed...

[flawless finish]

thanks mate, all info will help get the work and to do a good job, grateful for info, thanks, will ring schluter 2mro