Finding the real source of a leak
Water rarely comes through the ceiling directly below the fault. It can run along a batten, a rafter or the top of a wall before it shows, so the stain inside is only a clue. Duncan checks the roof covering, flashings, valleys and any penetrations above the wet area and traces the route back before recommending a fix.
- Cracked, slipped or missing tiles and slates
- Failed mortar at ridges, hips and verges
- Split or lifted flashing where the roof meets a wall or chimney
- Blocked or worn valleys that overflow in heavy rain

