Anyone know anything about roofing? Our new extension roof is leaking. It's a lean to, tiled roof, with lead flashing. I suspect the builder has failed to fit the flashing properly and has not cut it deep enough into the wall. He is a total muppet who will cut any corner he can. I really regret using him, but he came highly recommended by a client. I am very unhappy about this and would happily swear, but will not lower the tone on this forum. I have truly had a gut full of late. If it can go wrong, it certainly will.