thanks bigfoot, that’s what i figured, and have done once before on a small area.
do you seal-up/glue between the sheets?
don’t want to self level it as i’m not very good with it and it’s 30sq m.
So have ordered wedi, i get it quite cheap and found nothing cheaper.
totalshell, the vapour membrane stops moisture in the air, ie vapour.
it’ a good, variable, paper-based one, so want to keep it clean.