Hi all,

THe instructions for the shower base I'm installing say I need to add an
"anti-crumble" compound to the S&C mix. I can see how this would be
desirable since the shower base will be sitting directly on this bed of
mortar, but I've not come across such an additive before and don't recall
ever seeing such a thing, either. Is this just a fancy term for PVA or is
something more specific required?

cheers,
cd.