Roofer was going round our street today cleaning gutters so I got him to do ours. It was a reasonable cost and I saw what he took out. Stupid me asked him to check the roof and I heard him hammering away.
He came down with some pieces of cement that had lots of moss growing on them and told me it was the ridge at the top of the roof that needs replacing. (well of course it does now that he's hammered it out!!)
My neighbour doesn't think it's a problem at the moment and the ridge (which was all cement) won't cause an issue. Does anyone know about this?