Tiling onto concrete

[J_N30]

Sorry if this is an age old question, after a bit of a Google I'm getting mixed messages.

I want to tile Down stairs onto the concrete slab. House is late 80's. I'm expecting the tiled floor to be really cold but I'm not keen on the work involved in underfloor heating or the running costs.

Is there any advantage to laying a board over the slab or am I just wasting my time and money?

If I tile straight to the slab so I need a primer?

Cheers all!

 

[flameport]

No boards and no primer either.
Cement based adhesive directly onto the concrete.

 

[J_N30]

Thanks for the reply.

I've just lifted the standard plastic tiles and I'm left with a sticky black glue. Any suggestions on what to do with this?

 

[Paul C.]

Scrape up as much as you can, then paint a slurry coat over the top. At a ratio of 1:1 by weight, mix 1 part of an SBR primer to 1 part cement based adhesive. Rapidset adhesive will allow you to tile onto it quickly. There are some slurry/gritted primers available ready mixed, like the Mapei Eco Prim Grip

 

[foxhole]

I removed much of mine by heating a wide scraper with a blow lamp before pushing up glue, came off quite easily.Dont heat the glue or you get a very sticky mess.

 

[J_N30]

Cheers guys.

I've been to a local independent tiling shop today and purchased a special 2 part screed to level over it. Went down really well. Just need to find another spare day to tile now!!