Hi guys I want to ask a question to which I think i know the answer it is just that I have beend doubting myself sinc asking an experienced floor tiler.

I want to tile my bedroom floor complete with underfloor heating. The bedroom is upstairs. Havnt chosen the tiles yet but was looking at 450 x 450 porcelane. The current floor is chipboard which I was goig to remove, replace with 25 mm ply screwed every 150mm. I was also going to nogging out between the joiss. THe guy I was talking with said he wouldnt tile a suspended floor upstairs. Apparently he was talking to a lady who had something similar done and the installation had failed. I think this could have failed for any number of reasons.

I would ask whether you guys think my prep work mentioned above would be sufficient or whether there is any more or different I could / should do.

Im sure I cant be the only person to want to have an upstairs suspended floor tiled. I do have a bathroom and ensuite fully tiled with no problems but am now doubting myself.

many thanks - Ernie

has anyone got any views on this ?

Ta - Ernie

This is different to a floating floor. Doing what you intend should be ok as most bathrooms etc are done the same. Just make sure you have no bounce in the floor, extra noggins and screw down. You may need to think of some for of insulation boards too. Dont forget to prime back of boards and the edges before screwing to joists.

hi ernie the prep you list sounds good you could use cement sheet (6 mm) underlay on top of ply( seal ply of course ) screw c sheet down then ufh slc use a cement flex adh . should be fine worst enemy is deflect in floor so get it as tight as pos

Thanks guys nice to get the reassurance.

Ernie

Don't forget to take account of the extra weight on the floor from thand the tiles

Originally Posted by Ajax123

Don't forget to take account of the extra weight on the floor from thand the tiles

THanks for your reponse Ajax 123, sorry I have not got back but been away. You have now got me worried, How much weight is too much? the room is around 16M2. Would appreciate your advices.

Ta Ernie

Originally Posted by ern

THanks for your reponse Ajax 123, sorry I have not got back but been away. You have now got me worried, How much weight is too much? the room is around 16M2. Would appreciate your advices.

Ta Ernie

It's a calculation for a structural engineer really as it all depends on the size and type of joists, the spans and the joist centres. As a rule the floor will be engineered to offer a maximum deflection under loading of 12mm.
At just 16m2 it is unlikely to present an issue unless the tiles are particularly thick and heavy. At that size delfection and bounce are more likely to be your enemy. At 10mm I guess a natural stone tile would come in at about 1 tonne at that size.

bottom half of my house is a suspended floor and tiled overboarded with ply and backer board no problems

Thanks guys, so just to be straight, 25mm ply with insulation boards, slc for ufh adhesive and tile will be ok.

Not chosen tiles yet but max size will be 40 x 40, poss porcelane

Ajax 123 when you say loading under 12 mm are you talking about the tile thickness ??

ta Ernie