Lead Flashing Repairs & Replacement Mountain Ash
Perished or damaged lead flashing around chimneys, valleys and walls is one of the most common causes of roof leaks. K Williams Roofing repairs and replaces flashing to Code 4 and Code 5 standard across Mountain Ash.
- Free quotes
- Fully insured
- Fast response
- Local roofing specialists
Flashing Fixed Properly, Not Just Sealed Over
Lead flashing seals the join between a roof and a chimney, wall or valley - when it cracks, lifts or perishes, it's one of the most common places for a roof to start leaking.
We repair or replace flashing using Code 4 and Code 5 lead to current British Standard, correctly dressed into the brickwork or roof covering rather than just sealed with mastic.
Flashing problems are often the real cause of leaks that other repairs have missed – if you’ve had recurring damp with no obvious cause, it’s worth having your flashing checked.
Our Lead Flashing Services
Proper lead work around chimneys, valleys and walls.
Chimney Flashing Repairs
Cracked or lifted lead around chimneys repaired or renewed.
Valley Flashing
Lead-lined valleys repaired or replaced where water has been tracking through.
Wall Abutment Flashing
Flashing where a roof meets a wall repaired to stop water tracking in.
Skylight Flashing
Flashing around roof windows and skylights repaired or renewed.
Code 4 & Code 5 Lead Work
Correct-grade lead used and dressed in to current British Standard.
Storm-Damaged Flashing
Flashing lifted or torn in high winds repaired or replaced.
Leak Investigation
Tracing leaks that other repairs have missed back to failed flashing.
Chimney Repointing & Flashing
Flashing renewed alongside chimney repointing for a complete fix.
Why Choose K Williams Roofing?
Proper lead work that fixes leaks other repairs have missed.
Local Experts
Based in Mountain Ash, we know the local housing stock and valleys weather inside out.
Fully Insured
Comprehensive public liability insurance on every job for complete peace of mind.
Quality Materials
Weather-proven materials from trusted suppliers, chosen to last in South Wales conditions.
Fast Turnaround
Quick quotes, prompt starts and tidy, efficient work with minimal disruption.
Guaranteed Workmanship
Every job is backed by a workmanship guarantee you can rely on.
Competitive Pricing
Fair, transparent quotations with no hidden extras and no pressure.
Signs Your Flashing Needs Attention
The usual warning signs of failing lead flashing.
Cracked or Split Lead
Age and movement can crack lead flashing, letting water straight through.
Lifted or Loose Flashing
Flashing that has come away from the brickwork no longer seals the join.
Damp Near the Chimney Breast
A damp patch near a chimney inside the house often points to failed flashing.
Green or White Staining
Streaking on brickwork below flashing can be a sign it is deteriorating.
Recurring Leaks After Repairs
If a leak keeps coming back, the flashing is often the real cause.
Visible Gaps in Mastic Sealant
Mastic is a temporary fix at best - gaps mean the flashing beneath needs attention.
Recent Roofing Work by Our Team
A few recent jobs completed by our team across the South Wales valleys.
HeolgerrigComplete New Tiled Roof
Full re-roof at Andrews Close in slate-grey interlocking tiles.
View project
HeolgerrigLarge Grey Tile Re-Roof
Large property fully re-roofed in grey interlocking tiles with new felt and battens.
View project- Merthyr Tydfil
New Roof on Balaclava Road
Complete new roof installation with new fascias and guttering.
View project
Our Lead Flashing Process
Proper diagnosis, then a lasting repair.
- 1
Free Inspection
We inspect the flashing and surrounding roof area and explain exactly what's needed - no jargon, no obligation.
- 2
Detailed Quotation
You get a clear written quote with a full breakdown of materials and labour, and no hidden extras.
- 3
Work Completed
Our local team completes the work to a high standard, on schedule and with the site kept tidy.
- 4
Final Quality Check
We walk the finished job with you, check every detail and leave you with our workmanship guarantee.
Areas We Cover Around Mountain Ash
- Penrhiwceiber
- Miskin
- Cefnpennar
- Darranlas
- Caegarw
- Ynysboeth
- Abercynon
We repair and replace lead flashing across Mountain Ash and the lower Cynon Valley – Penrhiwceiber, Miskin, Cefnpennar, Darranlas, Caegarw, Ynysboeth and Abercynon. Free written quotations on every job.
Frequently Asked Questions
Common questions about lead flashing repairs in Mountain Ash.
How do I know if my leak is caused by flashing?
A damp patch near a chimney breast, valley or wall line is a common sign – we can trace it properly with an inspection.
How long does lead flashing last?
Good quality lead flashing can last 50 years or more, but poor installation or storm damage can cause much earlier failure.
Can flashing be repaired or does it need full replacement?
Minor damage can often be repaired, but perished or badly damaged flashing is usually better replaced properly rather than patched.
Do you repair flashing around chimneys?
Yes – chimney flashing is one of the most common repairs we carry out, often alongside chimney repointing.
Is lead flashing covered by insurance if storm-damaged?
Storm damage to flashing is often covered by home insurance – we can provide photos and a report to support a claim.
Which areas do you cover?
Mountain Ash and the lower Cynon Valley – Penrhiwceiber, Miskin, Cefnpennar, Darranlas, Caegarw, Ynysboeth and Abercynon.
Related Roofing Services
Every service below is part of our complete roofing services in Mountain Ash.
Chimney Repairs Mountain Ash
Repointing, rebuilds and cowls alongside flashing repairs.
View serviceRoof Leak Repairs Mountain Ash
Leak tracing and repair covering all common causes, not just flashing.
View serviceSkylights Mountain Ash
Skylight installation and repairs, including flashing around roof windows.
View serviceRoof Repairs Mountain Ash
General roof repairs for tiles, felt and more.
View service
Flashing Problems in Mountain Ash?
Get a proper inspection and a fixed-price quote for lead flashing repair or replacement.
Call us today: 07952 811592