Cement Type - Sovchem K11

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Chrisamyphillip

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Stupid question maybe, but going to ask anyway.

Just doing the K11 tanking and rather than using their sulphate resistant ready render (£'s), I'm using the alternative sand/cement 4:1 with SBR 1:4 BUT can I use Blue Circle General Purpose Cement or must it be Portland OPC?
 
any will work, opc was stopped years ago it now has 3 grades and you will struggle to find the right grades as no one sales it, use the sand cement render but beef it up to a good 3/1 mix, with water proofer and sbr in the mix. and its normaly best to be a scratch coat, then 2 layers of tanking then backing coat then multi ect.
 
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