Help!: Exterior tiling on uneven existing concrete

[Roy flint]

Can anyone recommend a deep bed leveling compound or adhesive for an old uneven conrete floor, need to make up to 25/30 mm to achieve fall away from house.
Thanks

[Dave]

Hello Roy and welcome...

Not all levellers are suitable for external use...

These are a few options that are available use...


Fast-setting cement based levelling compound for internal and external use from 3 to 20 mm thick.
Applications:
Internal and external levelling compound for all normal supports used in building provided they are clean, such as concrete slabs, cement screeds, old ceramic flooring, terrazzo tile, natural stone.
Apply 3 to 10 mm thick per coat.Coverage
1,5 kg/m2 per mm of thickness.Packaging
25 kg bags.






ARDEX K 301 - Fast Setting Exterior Self-Smoothing Levelling and Resurfacing Compound
Size (pack): 25kg
Coverage: Approximately 1.6kg ARDEX K 301 powder/m²/ mm, i.e. approximately 7.8m² at 2mm thickness per 25kg bag.
ARDEX K 301 Exterior Self-Smoothing Levelling and Resurfacing Compound is a special fast setting cement-based product designed to smooth and level rough and damaged concrete surfaces in external and internal situations. ARDEX K 301 is a grey powder consisting of special cements, graded aggregates and high quality synthetic resins. When mixed with water, a fluid mortar is produced which sets within 2 hours and can normally be walked on after approximately 2-3 hours at 20°C. ARDEX K 301 can be applied from 2mm to 20mm in thickness. The set and hardened ARDEX K 301 is usually ready to receive light wheeled traffic after 48 hours at 20°C.

What tile do you intend to use..?

[Roy flint]

Thanks for reply. I am using a non slip porcelain tile 300x300.
Roy

[Dave]

Cheers Roy, was just checking the tile was suitable for exterior use.....they are fine..

Mapei adhesives are great to use as well...I would use mapeker or keraquick..

[Rob Z]

Dave,

How do you use those SLC's so that the pour ends up with a sloped surface (for drainage)?

Roy, I'd rather do a mud bed so that the money goes into the tile setter's pocket rather than pay for a lot of SLC.

[Dave]

Dave,

How do you use those SLC's so that the pour ends up with a sloped surface (for drainage)?

Roy, I'd rather do a mud bed so that the money goes into the tile setter's pocket rather than pay for a lot of SLC.

They are smoothing compounds Rob and can be treated like screeding , where as you form the falls and it goes from thick to thin , which you can't do with screed/mud jobs, like from 1 inch to 1/16th or summit.

[Rob Z]

Dave, sounds good...must be a different class of products than what we have here.

I'm so used to just getting mud and covering it with a membrane...I didn't know that other stuff was avaialble...maybe it is here?

[Dave]

What can i say rob...times move on from mud jobs....

[Rob Z]

Dave, I say anytime the tilesetter can use a bunch of inexpensive sand and cement, and get great results without sacrificing any quality, then it's a good thing. More money in the company for the tilesetters and less to the supply house.