bonding on top of sand and cement after dpc ?

[terry the tiler]

hi ! totaly unrelated to tiling but thought id ask . iam having a damproof course put in my house that iam trying to sell, victorian 3 bed semi £150,000 if anyones interested . had a guy round to quote me and i asked how he would render it etc, he said a sand and cement first coat with the salt retarder in then a second coat of bonding would go over the sand and cement before the skim. ive had a few dpc done over the years and never herd of bonding going over sand and cement ? anyone no if this is common practice ? he did say there would be to much slumping of the sand and cement with one coat on . appreciate any feed back thanks !

[wrighty]

It used to be common practice about 20 yrs ago!But the backing coat of render will sweat and the Bonding will soak up this like a sponge!,will be okay for a few yrs then will detach itself from the render.Seen this countless times.It must be pretty thick if he cant get it done in one visit because rendering or sharp sand and cement mortar goes off pretty quickly.

[whitebeam]

Thats a no no and he's being lazy because the bonding will be easier to finish off rather than perhaps a second coat of render if needed...........

Should use Soverign renderlite which developed for the purpose for injected damp membranes, has all the additives already added for finishing off.