asphalt substrate!

[vosnack]

I'm about to tile in the extension where concrete base level was between 1 to 2 inches lower than the house floor. In order to level the floors the owner ordered asphalt floor to be laid down on top of sand packing. The asphalt is probably around 20mm thick. The floor seems solid. Can I tile on it? If yes how to tackle it?

 

[Ajax123]

at 20mm deep I would think you need to be wary. You can tile into Asphalt but you would probably need to overlay it first. There are a few options for this. You could use a gypsum based levelling compound. You could use a cement SBR slurry or you could use an epoxy sealer. Most people I know who have done this (not that many to be fair as it is not a common domestic substrate) have gone for the SBR cement slurry option. I would also use an uncoupling membrane to be on the safe side and to prevent any possibility of migration of the bitumenous oils which could stain your tiles long term

Others may have other options availbe

 

[DHTiling]

I think Alan has it covered here.

 

[vosnack]

Is that kind of structure solid enough though? As they've put some sand beneath the asphalt.

 

[DHTiling]

The sand is basicly an uncoupler.. i would have liked it to be a thicker pour than you have but if sound then it should be fine.

 

[vosnack]

They've also put membrane on top of the sand. Don't know what kind of membrane it is and what is it for, but probably is there for good reason. So what kind of levelling compound? Is there flexi one? The price range is quite huge. And what kind of adhesive? SPF?

 

[vosnack]

Oh. And also regarding cement SBR slurry? What is it and is it difficult to do? Thanks

 

[terrygrant]

SBR is a liquid much like PVA to look at but dont think you can use PVA insead as you will come unstuck (please excuse the punn
You mix it with neat portland cement and paint it onto the ashphelt then apply your adhesive for your tiles or decoupling membrane while it is still tacky so its fairly straight forward.
Good luck

Terry
On The Tiles (Hillingdon) Ltd
On The Tiles - Professional Tiling Service - High Quality Tiling London

 

[White Room]

Tradetiler Tilers Silicone and tools mixed with cement and using an old brush just worked into the surface

 

[vosnack]

So it does seem straight forward. Do I use SPF on top of that slurry? And also any views on levelling compounds? Thanks in advance