Chimney Leak

A brown patch beside a chimney tells you that moisture has reached the inside of the house. It does not tell you which external detail failed. The stain may sit below the flashing, but the water could have entered through the top of the stack or the masonry above. Repainting the breast or covering the lead with sealant does not establish the source.

Note when the damp appears, whether it follows rain and whether it affects one room or several. Tell us if the chimney is still used or has been capped. Those details help plan the inspection; they are not a substitute for seeing the condition of the chimney and its junction with the roof from suitable access.

The lead flashing carries water past the point where masonry interrupts the roof covering. A lifted edge, a crack or weathering that was too short can let water behind it. Mortar in the chase above the lead also matters: an open joint can create a route into the masonry behind what looks like an intact apron.

Our chimney repair work renews lead flashing in Code 4 or 5 where required and uses the correct detail rather than sticking a covering onto the surface. The adjacent tiles or slates need checking too. Repairing the flashing while leaving a damaged roof junction beside it would leave part of the water route untouched.

Flaunching is the mortar crown at the top of the stack that holds and weathers around the pots. When it cracks, water can enter from above rather than at roof level. Pots may need re-bedding or capping depending on their condition and use. Those are different tasks from replacing the lead at the base.

Weathered pointing also lets the stack take on water. The repair uses mortar matched to the masonry, including lime on older brickwork where appropriate. Simply adding a hard surface layer over failing joints does not give the same repair as raking out and repointing properly. The quote should identify which of these details actually needs work.

A disused flue may be capped to keep rain out while allowing air to move through. Sealing it completely can trap moisture and cause damp on the breast, so a capped chimney is not automatically a dry one. If the stack is no longer used, mention how it was closed and whether the damp began after that change.

Keep people clear of a chimney that appears unstable or is shedding material. Do not climb onto the roof or try to dismantle pots while inspecting a leak. If water is reaching electrical fittings or a ceiling is visibly sagging, stay away from the affected area and seek appropriate urgent assistance.

For active roof leaks, our North East repairs service operates Monday to Friday, 8am to 6pm, aiming to attend the same or next working day, weather permitting. Attendance is discussed when you call. Temporary weatherproofing and the permanent chimney repair are separate decisions, made according to the condition and safe access available.

Chimney repairs are quoted with scaffold or tower access included as appropriate, and photographs show the fault and completed work. On a shared stack, a clear account of the failure point helps both neighbours understand what is proposed. It avoids assigning every damp mark to one side without inspecting the masonry and flashing.

Use the form below to explain where the water appears and when you first noticed it. The chimney-repairs page covers the full service, including pointing, flaunching, flashing and pots; the removal page explains the alternative for redundant stacks. The useful next step is a diagnosis and an itemised quote for your chimney, not an assumed complete rebuild.