The short answer
The joint is the weak point. Where a tiled or slated roof, a chimney or a lead flashing meets an older wall or a thatched cottage, water finds the gap first. Most of our work in All Cannings starts at those junctions, because the thatch itself belongs to a specialist.
A cottage that has grown over four centuries has been added to many times. Each addition brought a new roof, and each new roof had to meet the old building somewhere. That meeting line is where we spend most of our time in villages like this one.
Q1.1Why do flashings fail at the cottage wall?
Flashing is the thin metal, usually lead, folded into a wall and over the roof edge so water cannot slip between them. On a timber-framed cottage the wall moves with the seasons, and a stiff or badly dressed flashing lifts away from it. Rain then tracks behind the metal and into the structure. The repair is rarely dramatic: the old lead is lifted, the wall behind it is checked, and a new strip is dressed in with a fold that can flex. Our page on lead roofing explains how the metal is chosen and fixed, and the roof repairs page covers the wider picture of tracing a leak.
Q1.2What about a stack rising through thatch?
A chimney rising through a thatched roof needs careful attention, because the stack, its flashing and the flue lining all matter at once. We look at the pointing, at the flaunching (the cement collar that seats each chimney pot), and at any cracks running through the brickwork. Where a flue is in use, the condition of the stack is a safety matter as well as a damp risk, so we describe what we see and what we would leave alone. More detail is on our chimney repairs page.
Q1.3Which lean-to roofs give up first?
Lean-to roofs are often the first to need work. They are low, shaded and fitted with gutters that collect leaves from nearby trees. A blocked gutter spills down the wall, and damp shows indoors long before the covering itself has failed. Clearing and resetting the gutter is a small job; leaving it can grow into a large one. We also look at what the overflow has already done to the fascia and the wall plate behind it, because rot there changes the repair.
None of this needs the thatch to be disturbed. We work from ladders and roof ladders positioned clear of the straw, and we agree access with you before the day.