Recent content by Jonathand

The moisture will go into the dabs and plasterboard loves water, will soak it all up. What's S+C?

You're scaring me

Why the vertical joints? What's the effect of doing that?

Soot contains high levels of salts that are hygroscopic. They will absorb moisture from the air, which will then travel through the dabs to the plastered surface and produce a brown/yellow stain. Just the same as when there's been rising damp, but different salts.

I emailed zissner about using the stain block for blocking soot. Their reply was B-I-N is more suitable but it can't prevent salts coming through.

and that will stop moisture from the salts coming through? easy then

not an engineer, though i think i missed my calling there.

hi all i've removed a chimney breast upstairs and down and have soot deposits on the walls. im dotting and dabbing the whole house so want to do the same on these walls, because i can do it quite well and i'm terrible at plastering otherwise and it's cheaper for me to D&D and then have it...