Mortar for flags question

[Overworked]

Apologies if this is mentioned somewhere but I could no find it.

When preparing the mortar mix for concrete flags I had thought that it would be a good idea include an additive that helped to waterproof the mix (Prevent break up in frosty weather) Is this recommended and if so please point me to where it is described (if it is that is)

Thanks in advance

[msh paving]

Can't see any point myself, waterprofer does not make it frost proof, MSH

[Overworked]

Can't see any point myself, waterprofer does not make it frost proof, MSH

So is frost damage or anything I should be concerned with and what could I do

Thanks

[lutonlagerlout]

if you are worried about adhesion use SBR in the mix and try and point while the bedding is still plastic
other than that
crack on
LLL