Tiling a room which has different types of floor

[yukisan]

Hi, This is the first time I am posting in this forum and I hope you can help me.
I have a kitchen which is 34 m2 area and has an L shape. The kitchen is part of a new extension. The floor is mainly new concrete screed floor but has an area (old kitchen side) which is floor boards. The concrete area and floor board area are at the same level.
I want to tile the whole area with ceramic tiles. My questions are;
- Can I tile directly onto floor boards as long as they are secured (with screws ) and using flexible adhesive? or do I definitely have to replace floor boards with plywood?
- If I have to replace floor boards with plywood what would be the best type?
- If plywood area ends up being lower than concrete area what can I use to level it?
- Some tiles are going to be placed half on the concrete side and half on the wood/plywood side which kind of adhesive shall I use? can i use flexible adhesive on concrete side? if that is the case shall I use flexible adhesive for all area or only up to that tile?
- I am planning to seal the whole floor (concreted and boarded area) with diluted PVA before tiling. If I replace floor boards with plywood, Do I need to seal the new plywood?
- I have few small cracks and some small holes on the edges of the concreted area. What can be used to fix them?

I hope my questions are clear and would really appreciate any advice I can get.
Thank you very much for your time.
L

[builderbanter]

Hi,

You could tile directly onto the floorboard, although it'd probably be better to lay plywood. This is because if you (or someone else) takes the tiles up later on, it doesn't damage the floor boards. Plywood comes in different thicknesses so you can probably find one that works out level. You could also put plywood on top of the concrete. It'd be best to seal the plywood too, or just seal over the tiles once they're laid.

Hope this helps.

[marc1106]

look into using a decoupling system to go over the entire floor area then you dont have to mess around with different addys ,Shcluter (can never say it never mind spell it) do a goodun a local tile supplier should have it in stock, then is a case of fix boards down lay the shcluter acording to instructions then tile!

[tictic]

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re:tiling 2 differant subtrates

you will want to get them level,either by overboarding the wooden one,with either a cementbased backerboard..hardie,wedi,aquapanel ..etc..follow mfr instuctions.

or overboarding with min 18mm wbp ply..

make sure the floorboards are sound and in good condition first(no deflection at all)
or
rip up floorboards and replace with 25mm wbp ply.

if going for any off the wbp ply routes,you will want to prime the underside and edges with a sbr(stops moisture ingress from below)before laying them.

then you will HAVE TO PUT AN EXSPANSION JOINT between both subtrates,when it comes to tiling, as you will get movement in this area, as its 2 differant subtrates,you can buy ones from shulter etc or use a silicone that will match your grout colour.

leave 5-10mm gap around the perimeter of the room as well for exspansion,fill with silicone or exspansion joint, then put your skirting on.

re:conctrete/screed floor...
sweep this then prime with a sbr(m.i.) up the room then when dry across the room(100% coverage)..

as for priming the face of your wbp ply,this depends on what adhesive mfr you go with,follow m.i regarding this(some will say yes/some will say nae).

as for adhesive i would advise you just buy a flexiable one for the whole area,flexiable grout as well.

just make sure the wooden floor HAS NO DEFLECTION WHAT SO EVER..




leave a gap off 5mm+ when you put wbp/b.board up to the solid floor.

-- Fri Jul 02, 2010 7:49 pm --

Hi,

You could tile directly onto the floorboard, although it'd probably be better to lay plywood. This is because if you (or someone else) takes the tiles up later on, it doesn't damage the floor boards. Plywood comes in different thicknesses so you can probably find one that works out level. You could also put plywood on top of the concrete. It'd be best to seal the plywood too, or just seal over the tiles once they're laid.

Hope this helps.

never ever tile direct onto floorboards..
as for thickness of wbp ply min is 15mm for overboarding but....i can count on one hand, how many times i have worked/used 15mm wbp ply...so you would have to go for 18mm wbp ply,as this and 15mm wbp ply have the same strength/ridgitiy..etc..but you may have to go higher with the wbp ply(depends on joist spans/how much traffic will be going over the area.etc..)