Uneven Floor

[junglejim01]

Sorry for editting and reposting.
This is what my builder said he would do: "break up floor area, hardcore with dolimite, damp proof membrane, insulation, concrete"

He knows that I intend to tile, trouble is that some of the floor is uneven with lumps and bumps several mm and almost 1cm. I'm worried that this is going to affect my tiles?

Any thoughts welcome as i'm meeting with the builder first thing in the morning.

Thanks

 

[pinenot]

He who pays the piper calls the tune, get everything sorted out before he commences...pinenot

 

[junglejim01]

Thanks...hence posting on here. I'm not sure what's standard for finishing a concrete floor. Should it be a perfectly level finish? Should it be screed over the top?

Also noticed that in a few patches the surface is dusty. If i brush, it leaves marks on the floor. Does this mean it hasn't set properly? It's been down nearly a week and the builder said would be ok to use by this weekend.

Cheers

 

[pinenot]

For tiling the surface should be level and at worst a brush finish. That means a surface that is within 3mm +- of strait over a 3m length in any direction, any worse than that and you would require to either screed or a self leveling compound.

Concrete that can be marked after 3 days of curing is faulty unless were talking about a white/grey scratch mark, say from scraping over with a key...pinenot

 

[junglejim01]

Ok, thanks for the reply. Looks like i've got some talking to do with the builder.

 

[junglejim01]

Just met the builder. He's going to sand down the lump in the floor to make it level...sounds ok. The dusty area he said was normal but i'm not convinced. Is it possible this just needs longer to cure given the cold weather. It's been 6 days and when brushed the surface in one part of the floor comes away as dust. I'm planning on tiling eventually, is there something i can use to seal/harden the surface? or any other solutions?
Cheers

 

[pinenot]

You can buy a concrete hardener/dustproofer which you roller/paint on, but I would proffer this - that is the builders duty.
Somethings not right, that's not to say he's done something wrong, but whatever it is he is responsible, so you may suggest but let him make the choises.
Old floors to be tiled (Aye and some new ones) sometimes need a self leveling screed prior to tiling, as the tile cement should be applied as evenly as poss...pinenot