We had a conservatory built on the back of our house a while ago and one of the windows was bricked up enternally with a view to blocking the internal section at a later date. Today is the later date! I have taken the old sash out and have studded the gap out and covered with 12.5mm pb, allowing for 3mm back from the exisitng plaster finish. However, when I removed the Architraves some of the old plaster and render underneath came away "as expected" taking me back to bear brick.
I want to repair this damage myself rather than get a spreader in as its quite minor, but I am unsure of whether I should put a substance i.e PVA over the bricks first to provide a key and which coat I should apply first i.e Bonding Coat/Hardwall and do either of the mentioned stick to metal conduit as there is a run of just metal conduit. I can spread finish coat I just not sure what goes before it, thank you very much in advance.
I want to repair this damage myself rather than get a spreader in as its quite minor, but I am unsure of whether I should put a substance i.e PVA over the bricks first to provide a key and which coat I should apply first i.e Bonding Coat/Hardwall and do either of the mentioned stick to metal conduit as there is a run of just metal conduit. I can spread finish coat I just not sure what goes before it, thank you very much in advance.