Hi, the cracks in the wall beneath the purlin have been there a while. I forgotten about them tbh as I've had other stresses in life. But having started some works down stairs (damproofing and skim). I went to check and knowing next to nothing about construction and a habitual catastrophiser I'm now worried.
It's a party wall in a small 1860 mid terrace built in Cheshire brick with 9 inch solid walls and there the neighbors chimney on the other side. They had removed the chimney in the first floor and had to have it supported over twenty years ago. The cracks are slightly bigger since then, there are hairline cracks in the render in my first floor directly beneath. I've been told it could be settlement and not to worry from a builder, just maybe put some straps in. But should I get a structural engineer in too have a look? Any advice gratefully taken. I've included the opposite end of the beam in my house to replicate what is on the other side of the party wall