conservatory floor

[lcjohno]

Hi all, i've got job coming up in a couple of weeks tiling a conservatory floor 25m2. The floor is already tiled with underfloor heating which runs off the central heating system. The customer wants me to tile straight ontop of the old tiles so i wanted to check and see if what i was going to do is correct. 1. clean old tiles with suger soap or something similar to get rid of any dirt/grease. 2, secure any loose tiles and make good. 3. score or rough up old tiles. 4. prime old tiles. 5. tile as normal using flex addy and grout. Pulling the old tiles up isn't really an option with the underfloor heating.Hope what i said makes sense, i've never tiled straight ontop of old tiles before, any help would be great, cheers.

[sranners]

hi mate, if its warm water heating then the tile will be onto a wet cement , i cant see the problem with taking them up, other than that i dont see why u cant tile on top as above, it will affect the heated floor though.

[lcjohno]

how bad will it effect the heating, will the heat coming through just be less or take longer to warm up? I dont think they will want old tiles taking up cos of cost, dont know what it will be like after taking them up either. guessing i would have to use a SLC.

[grumpygrouter]

Extra layers of SLC and adhesive and tiles will push up the running costs. along with an increase in height of the floor!

[doug boardley]

if it's a water borne heating system, I'd really be wanting to remove existing tiles

[lcjohno]

is it going to effect the heating alot?

[CJ]

Yes...........it will take a lot longer to heat the floor.

2 layers of tiles & 2 layers of cement.

[sranners]

it will take a lot longer to heat up and cost a lot more, id tell them if they want the job done right you have to take up the tile, if the floor is bad under it and you cant scrape the addy of the a slc is the way. you can higher a machine that takes the tile up but dont know were you would rent one, iv seen a rubi on on sale befor.

hope this helps

[Alan.P]

you can higher a machine that takes the tile up but dont know were you would rent one,

I wouldn't want to use any machine with pipes involved, take them up by hand, better feel for each tile and you can see up close what is going on, as said by others though, heat is a big problem, take them up

[sranners]

im not talking about a kangol!!!!
they are designed for the job,

[sranners]

[Alan.P]

im not talking about a kangol!!!!
they are designed for the job,

Yep, used them, only to lift vinyl tiles mind you, as I said, I wouldn't want to use any machine where pipes are involved, each to the own.