The story is this - my workshop is a wooden shed possibly 50+ years old ( it was old when I got the property 30 years ago). I'm having to do the 50+ year make over !
I've now worked out that the guy laid a rough concrete base without a membrane, built the woodwork and then laid a 40mm concrete floor inside against the framing - yes I know it's astonishing it's remained standing this long. Anyway that's being sorted. The other thing I've worked out is that the entrance door was originally at one end but was moved to the side with the frame work cut away at that point and a bit of new concrete added to form a door cill. It also explains why the lintel is so low at that point such that every so often I scalp myself on it! - that also is going to addressed.
It's this 40mm deep x 75mm wide x 800m long step that has broken up completely and needs replacing. The base is rough concrete.
Do I just paint the base with neat PVA and add a dollop of PVA to the screed/concrete; how much is 'a dollop' and do I lay the step with the painted on PVA still wet?
Thanks
Rob