hi, got to quote a job, new build apartments upstairs floor has been screeded then ontop of screed there fitting sound proofing boards its like a chip board with a rubbery sponge on underside feels a bit springy when walking on would i have to go with 2 part adhesive to tile on, any advise would be great if anyone has tiled on it before .....

its a floating floor nightmare use 2 part but get a disclaimer

dont tile on these boards get the buider to remove them and change the tiled areas for a foam cement backer board like dukka wedi or marmox then use a rubber 2 part adhesive and you will have a sound proof tiled floor,the bounce in your sound proof boards will cause a failure due to movement

i agree marmox very good sound proofer i bet they wont change though they will say its to expensive

cheers lads dont think builder will change thou had lads there laying them when i was looking at what he wanted doing thery had already done 3 apartments and were doing the same with all the others.

Would ask the manufactuerer of the sound proofing boards what he recommands for laying tiles resp. how to lay tiles on his boards !!!

Hi Rossy

Hope this helps

SUBSTRATE CONSIDERATIONS
The floating timber floor should be carefully examined prior to tiling to ensure that it can carry the additional dead load without excessive deflection. The following extract from Section 14.4 of BS 5385 Part 3 1989 is relevant.
“New timber bases should be designed not merely to carry the additional load, but also to provide a stiff floor. The limit of deflection permitted in BS 5268 “Structural Use of Timber” may be too great to avoid damage to a rigid finish and its bedding,”
Therefore the main considerations for the fixing of ceramic floor tiles to a floating floor are:-

1. The concrete substrate must be of an even finish with no localised raised areas, as these may cause uneven compression of the resilient layer

2. The tongue and groove joints of the flooring grade chipboard must be fully located and bonded with a high quality wood adhesive.

3. The timber floor receiving the tiled surface must be stable and free from any deflection and able to receive a rigid floor tile.

4. The timber layer must be clean and free from any dirt dust or any layer that may inhibit the adhesive from bonding to the surface.

5. Any junctions between adjacent boards must in all cases be supported underneath. e.g. butt-jointed edges.

Where the floor is deemed to be unstable it may be stiffened by:-

1. Overlaying the existing board with a minimum thickness of 15mm water-resistant plywood laid with staggered joints.

2. Battens may be used to support the boards at a maximum of 300mm centres, having first secured the battens to the base structure.


FIXING OF TILES
Tiles may be fixed directly to a stable timber floor in a solid bed of BAL-FASTFLEX adhesive keeping the final bed thickness to the minimum that the tile and floor will allow, ideally 3-4mm thick.

floor seems to have settled down alot in last week all joints have been glued, told developer to get advise off the company that makes the boards got plenty of bathrooms and kitchens to do before we get to the floors so ill let him get the info and take it from there thanks for all advise...

That is all well bal tas 2 if a floating floor is free from deflection...i haven't come across one yet though......As for overboarding...this won't work if the deflection is around the perimeter of the room as well as the rest of the floor as the overlay will just move with the sub-floor , hence debonding will occur or at very least the joints will give resulting in a failure...I know that fasflex will stick the tiles no problem but its the strength of the joints that will give up...or if stone is used then the tiles themselves....

There is more to consider than just controling the timber deflection....floating floors are generaly laid upon polystyrene base ( kingspan is one make) and this is where you can't control the deflection as this compresses/flex's as well....IMO floating floors should NOT be tiled.....and i for one IMO know that if a floating floor failed whilst using fastflex or any other 2 part adhesive then the manufactuerer would not stand by any gaurentee....

looks like laminate will be going down then the developer will not gamble on it if any doubts...

ive just tiled 25 bathroom floors on floating floors with the acoustic ragapoul on top of the floating floor and then used the acoustic bond from bal and and bal super flex grout no problems at all

Originally Posted by D TILER

ive just tiled 25 bathroom floors on floating floors with the acoustic ragapoul on top of the floating floor and then used the acoustic bond from bal and and bal super flex grout no problems at all

YET!!!!...

and they mosaic tiles .. been layed about 3 months and no problems at all but i did get a disclaimer lol

i carnt afford to take a chance on floors because i know six months down the road if anything goes wrong the buck will stop with me ill just stick to the walls on this one..