Hi All,

I am going to use sika 1 for tanking purposes in my basement. I have looked at other products but this seems to be pretty good.

My issue is that I rang Sika 1 and they said they recommend only using their spritz (sand and cement mix) for sika 1... I mean talk about money making scheme... it's just a mix of sand and cement.

I wanted to know if anyone knows the right mix for the 3 coats of sand and cement needed (and also what kind of sand... i was thinking rendering/plastering sand... is that correct??

From my research I gather this is the correct method:

coat 1: 1:1 (rendering/plastering sand:cement) for spritz left 4-6hr throw at the wall and don't trowel it in (6mm coat).

coat 2: 1.5:1 (rendering/plastering sand to cement) render coat to be left over night.

coat 3: 2:1 (sand: cement) for the finish coat, so I suppose it would be a plastering sand as you can just paint over that.

If someone please could let me know if the above ratios of sand:cement is correct and also exactly what kind of sand is used at each stage that would be fantastic.!!!!

Oh yes you should use 10:1 (water: sika1) when mixing.

cheers

shabba