How to Spot Lead Flashing Damage Before It Causes Internal Damp

Leadwork succeeds when the complete detail allows water to drain and the metal to move with temperature. Patching a visible split may fail if laps, upstands, mortar chases or adjoining coverings are also defective. This guide explains the practical checks a Bromley property owner should make before requesting or approving work.

Quick answer

Leadwork succeeds when the complete detail allows water to drain and the metal to move with temperature. Patching a visible split may fail if laps, upstands, mortar chases or adjoining coverings are also defective.

lead in this decision

Lead is durable when correctly detailed for movement, laps and drainage. Long unsupported lengths, poor chases and incompatible adjoining work can shorten its service life.

From symptom to repair scope

Start with when the problem occurs: during wind-driven rain, after prolonged rainfall, at an outlet overflow or in cold weather. That pattern helps identify whether the cause is a covering defect, junction, drainage problem or condensation.

• Record the affected room and weather conditions
• Photograph safe internal evidence and any ground-visible defect
• Inspect the complete detail around the likely source
• Agree whether opening-up is necessary and how uncertainty is handled
• Specify the permanent repair and any temporary weatherproofing separately

Repair or replace?

Local repair is usually worth considering when the surrounding material and support remain sound. Replacement becomes more credible when defects are widespread, the deck or structure is affected, matching repairs keep failing or access costs make repeated visits uneconomic.

Separate an observation from a diagnosis

A ceiling mark, displaced tile or cracked surface is evidence, but not always the complete cause. Note when it changes, which weather direction triggers it and whether an outlet or roof junction sits above. Those details help the inspection test a likely water route.

• Monitor change rather than repeatedly painting over it
• Photograph from the same safe position for comparison
• Check accessible loft areas without touching electrics or fragile materials
• Treat loose masonry and bulging ceilings as safety issues
• Ask the roofer to explain the link between symptom and proposed work

What should be inspected?

• Splits, pinholes and previous patch repairs
• Laps, steps, upstands and cover dimensions
• Movement restrictions or overly long sections
• Mortar chases and fixings
• Valley, box-gutter and outlet drainage
• The condition of slates, tiles or masonry beside the lead

Access can change the repair method

Terraced and converted properties can have different access at the front and rear. The quotation should say whether scaffold, a tower or another planned system is assumed, and how materials and waste will move without damaging occupied areas.

• Front and rear access considered separately
• Shared routes agreed before work
• Protection below the work included
• Parking and delivery assumptions recorded

Assume sheeted roofs and rooflights are fragile

Old sheets, corroded material and rooflights can fail without warning. Do not test them by standing on them. A competent contractor should identify fragile areas and plan platforms, protection and access that avoid loading them. The HSE roof-work guidance explains the main requirements and hazards.

Questions to ask in the quotation

• Why did the existing detail fail?
• Is repair practical or is replacement needed?
• What lead code and joint arrangement is proposed?
• Are adjoining slates, tiles and mortar included?

Related local service

For property-specific advice, see Leadwork and flashing repairs. The service page explains inspection, access and quotation arrangements.

Frequently asked questions

Should I obtain more than one quotation?

For substantial work, comparable written quotations can help. Make sure contractors price the same scope rather than comparing totals with different omissions.

Should the quote include waste and protection?

Yes. Ask it to identify access, protection, preparation, disposal, materials, exclusions and work that can only be confirmed after opening the roof.

How are unexpected defects handled?

The quotation should identify likely concealed risks and a variation process. Ask for photographs and approval before additional work is covered or charged.

Discuss your roof with a local roofer

For an inspection and written quotation in Bromley, call 020 3886 3911 or email yourbromleyroofers@gmail.com. Describe the property, the roof area and any visible leak or damage. Photographs taken safely from ground level or inside the loft can also help.