Lead Flashing Repair
Apron, step flashing, and counter-flashing renewed.
Learn More
Chimney Leaks Begin at the Flashing — We Provide Lasting Solutions
The junction between chimney and roof is the most common site of water ingress in London properties. Our flashing specialists install and repair every chimney flashing configuration, using lead, codeflash, and modern sealants to achieve permanent weatherproofing
- Traditional Code 4-6 lead flashing for period properties
- Modern codeflash systems for quick, reliable repairs
- Chimney saddle installation to prevent abutment leaks
Roof Repair London
4.9 Star Rating
20+ Years Experience
Free Roof Inspection
Fill in your details - we'll get back to you within 1 hour.
Professional Chimney Flashing Repair London in London
Chimney flashing represents one of the most critical details in roofing. The junction between a chimney stack and the surrounding roof membrane faces constant exposure to weather, thermal movement, and potential movement in both the chimney and roof structure. When flashing fails, water penetrates immediately, causing damage to ceilings, walls, and structural timbers that often costs far more to repair than the original flashing work would have required.
KS Roof Master specialises in chimney flashing repair and installation across Greater London. Our lead-working craftsmen understand traditional techniques for period properties while also specifying and installing modern flashing systems where appropriate. Whether you need simple repairs to existing leadwork or complete flashing replacement on a Victorian property, we deliver solutions that prevent water ingress permanently.
London properties present particular challenges for chimney flashing. Victorian and Edwardian chimneys on terraces in areas like Clapham, Dulwich, and Highgate often have complex geometries, wide chimney stacks, and original details that conservation requirements must respect. Modern properties may use different construction techniques requiring alternative flashing approaches. We assess each situation individually and specify appropriate solutions.
Lead remains the traditional material of choice for chimney flashing, valued for its durability, malleability, and appropriateness for heritage buildings. Code 4 lead suits vertical flashing details where thinner material is acceptable. Code 6 lead provides robust performance for saddles and horizontal surfaces. Our leadwork follows Lead Sheet Association guidelines, ensuring correct specification, detailing, and fixing for lasting performance.
Common Chimney Flashing Problems We Resolve in London
Chimney flashing failures manifest in various ways, each requiring specific remediation:
Lead Expansion and Contraction
Lead expands in heat and contracts in cold, with significant movement over daily and seasonal cycles. Traditional fixing with iron nails causes problems as rust expands and splits the lead. We use copper or stainless steel clips that allow movement while maintaining secure fixing. For longer runs, we install expansion joints that absorb movement without cracking or tearing.
Inadequate Flashing Coverage
Original flashing on older properties often provides insufficient coverage, with lead not extending far enough up the chimney or across the roof. We replace inadequate flashing with properly dimensioned leadwork, ensuring minimum upstand heights and adequate overlap with roof coverings to prevent wind-driven rain from bypassing the flashing.
Missing or Failed Mortar Chase
The mortar joint where flashing embeds into brickwork deteriorates over time, creating gaps that water penetrates. We rake out failed mortar and recede new mortar, creating a proper chase that holds flashing securely while maintaining a weatherproof seal. For conservation properties, we use traditional lime mortar appropriate for the building type.
Absence of Chimney Saddle
Wide chimneys on low-pitched roofs or those positioned on the slope weather side require saddles to divert water around the stack. Without a saddle, water pools behind the chimney and inevitably penetrates the abutment flashing. We install Code 6 lead saddles with welded corners, counter-flashed into the brickwork above the roof line.
Soaker Deterioration
Individual lead soakers at each tile course where the roof meets the chimney are vulnerable to corrosion and displacement. We replace individual soakers or the complete soaker course, ensuring each piece is properly dressed into the tile profile and stepped behind the adjacent flashing.
Storm Damage
Severe weather dislodges flashing sections, tears edges, and damages fixings. Our emergency response team secures exposed areas temporarily and completes permanent repairs quickly, preventing water damage while full remediation is arranged. We document damage for insurance purposes where applicable.
Benefits of Professional Chimney Flashing Installation
Quality flashing work provides lasting protection when executed correctly:
Proper Lead Specification
We specify appropriate lead codes for each application: Code 4 for vertical upstands and flashings, Code 5 for general use, Code 6 for saddles and horizontal surfaces. Correct code selection ensures durability without waste from over-thick material. All leadwork follows Lead Sheet Association guidelines for lifespan and performance.
Movement Accommodation
Modern fixing techniques allow lead to move thermally without fatigue. Stainless steel clips, copper nails, and expansion joints at regular intervals prevent the cracking and splitting that occurs with traditional iron nail fixing. These details cost little but extend leadwork lifespan substantially.
Correct Upstand Heights
Industry standards specify minimum flashing upstand heights above roof surfaces. We ensure all flashing extends at least 75mm above the surrounding roof, with additional height on flat roofs and exposed locations. Adequate upstand prevents wind-driven rain from overtopping flashing and causing penetrations.
Proper Mortar Chase Detailing
Flashing embedded in brickwork must be held securely while allowing for differential movement. We create proper chases using appropriate tools, install leadwork correctly within the chase, and seal with flexible mortar that accommodates movement without cracking. This detail prevents the separation that causes most flashing failures.
Chimney Saddle Installation
Where saddles are required, we fabricate Code 6 lead saddles with welded corners, not folded seams that could leak. Saddles are counter-flashed into the chimney brickwork above the roof line, creating a continuous weatherproof system that diverts water around the chimney while remaining hidden from view.
Conservation Compliance
For listed buildings and properties in conservation areas, we use traditional leadwork techniques that satisfy conservation officer requirements. We understand what details planners expect and can advise on appropriate specifications that maintain heritage character while providing lasting performance.
0
Roof Repairs Completed
0
Happy Customers
0
Years Experience
0
Hour Response Time
Chimney Flashing Repair Projects Across London
Completed flashing repairs on period and contemporary properties.
Roof Repair – Bermondsey, SE1
Flat Roof Replacement – Croydon, CR0
Slate Roof Restoration – Greenwich, SE10
Commercial Re-Roof – Canary Wharf, E14
Gutter Installation – Chelsea, SW3
Chimney Repointing – Islington, N1
Tile Replacement – Wembley, HA9
Emergency Leak Repair – Hackney, E8
Roof Insulation – Richmond, TW9
Velux Window Install – Hampstead, NW3
Lead Flashing – Westminster, SW1
Storm Damage – Battersea, SW11
Flat Roof Coating – Brixton, SW2
Fascia & Soffits – Fulham, SW6
Roof Survey – Kensington, W8
Moss Removal – Wimbledon, SW19
GRP Fibreglass Roof – Peckham, SE15
EPDM Rubber Roof – Stratford, E15
Zinc Roofing – Shoreditch, EC2
Roof Waterproofing – Clapham, SW4
Why London Property Owners Trust Us With Flashing Work
Expert installation, heritage compliance, lasting repairs.
20+ Years Experience
Trusted roofing expertise across London since 2004.
Fully Insured Company
Complete insurance coverage for your peace of mind.
Fast Response
Rapid response times across all London boroughs.
100% Satisfaction
We guarantee quality workmanship on every project.
Quality Materials
Only premium, industry-leading roofing materials used.
Complete Chimney Flashing Services for London Properties
Lead, codeflash, and saddle installation for every chimney.
Chimney Saddle Installation
Code 6 welded saddle to divert water away from abutment.
Learn MoreCodeflash Repair
Self-adhesive membrane flashing for modern applications.
Learn MoreFlashing Recessing
Chase-and-seal method for conservation properties.
Learn MoreSoaker Replacement
Tile-and-lead soakers renewed at each course.
Learn MoreComplete Flashing Overhaul
Full chimney flashing replacement for ageing systems.
Learn MoreChimney Flashing Issues? Book a Free Inspection in London
Our Chimney Flashing Process
Thorough diagnosis, appropriate repair, quality materials.
Book Free Inspection
Schedule your free roof inspection online or by phone.
Roof Assessment by Experts
Our certified roofers thoroughly inspect your roof.
Transparent Quote & Repair
Receive a detailed, no-obligation quote and we get to work.
Chimney Flashing Repair London - All Areas Covered
Chimney flashing repair across all London boroughs.
Camden
Hackney
Islington
Westminster
Southwark
Lambeth
We serve all London boroughs within 24 hours.
Our Google Reviews
Google
James Wilson
Croydon, South London
"KS Roof Master did an outstanding job repairing our roof after storm damage. Fast response, fair pricing, and excellent workmanship."
Sarah Thompson
Islington, North London
"We had a leaking flat roof that other companies couldn't fix. KS Roof Master diagnosed the issue quickly and the repair has been perfect."
David Patel
Greenwich, East London
"Professional from start to finish. The free inspection was thorough and the quote was transparent with no hidden costs."
Chimney Leak or Flashing Failure? Contact Us Immediately
Rapid assessment and temporary protection while repairs are planned.
Water staining below chimney
Damp patches on ceiling
Visible flashing damage
Mortar crumbling at abutment
Chimney Flashing Repair Costs in London
Transparent pricing for common flashing repair scenarios.
| Service | Starting Price |
|---|---|
| Chimney Flashing Inspection | FREE |
| Lead Flashing Repair | £280-£450 |
| Chimney Saddle (Code 6) | £380-£500 |
| Codeflash Repair | £220-£320 |
| Soaker Replacement (per course) | £25 |
| Complete Overhaul | £600-£900 |
* Final costs depend on chimney size, access complexity, and material specification.
Book Your Free Chimney Flashing Inspection
We assess flashing condition and provide transparent repair quotes.
- Full roof condition report
- Photo documentation of all findings
- Expert repair recommendations
- Transparent cost estimate
Claim Your Free Report
Chimney Flashing Questions Answered
Technical guidance on flashing materials and installation.
Chimney flashing fails due to: thermal movement (lead expands and contracts, loosening clips), corroded fixings (iron nails rust and expand, splitting the lead), insufficient height at upstands (water blows back over flashing), deteriorated mortar (mortar shrinkage exposes edges), and inadequate coverage (flashing too narrow for the application). Our installations address all these failure modes.
Lead is the traditional choice for period and listed properties — conservation officers prefer it, and lead's malleability allows perfect detailing around complex chimney geometries. Codeflash is appropriate for modern properties where speed matters more than heritage aesthetics, and for quick repairs where full leadwork isn't justified. We advise on the best solution for each situation.
A chimney saddle (or cricket) is a small peaked structure behind the chimney that diverts water around rather than into the abutment. Chimneys on low-pitch roofs or wider chimneys require saddles to prevent water pooling behind the stack. Saddles are typically Code 6 lead, welded into a continuous sheet, and counter-flashed into the brickwork.
Our installations include: stainless steel clip fixings (not iron nails) allowing thermal movement, adequate upstand height (minimum 75mm above roof surface), cover flashing cemented into the brickwork with movement allowance, and lead expansion joints on long runs. Proper detailing at specification stage prevents future failures.
Yes — chimney flashing is accessed from the roof, and safe working practices require scaffolding with appropriate edge protection. We erect compliant scaffold systems and include all access equipment in our quotes. For listed buildings, we install scaffold with padding to protect decorative stonework.
In most cases, yes — flashing can be repaired or replaced without disturbing the chimney structure itself. We rake out and renew mortar where flashing embeds in brickwork, replace damaged lead sections, and renew clips and fixings. Only if the chimney brickwork is severely deteriorated does full rebuild become necessary.
Stop Chimney Leaks Permanently — Book a Free London Inspection
Expert flashing that protects your property for decades.