Lead flashing failure is the most common cause of persistent roof leaks on Borough Green period properties. A25 road vibration progressively loosens chimney pot bedding mortar is the primary accelerant in Borough Green. We replace chimney aprons, step flashings, valley lead and dormer junctions — Code 5 as standard on all exposed positions. Free diagnosis visit. 8 miles north-west from Tonbridge.
Lead flashing work in Borough Green requires correct specification — Code 3 on an exposed Borough Green chimney fails within 10 years. We specify correctly by default.
The apron flashing — front face of the chimney — takes the highest weather loading in Borough Green. Code 5 (2.24mm) minimum. Welted joints on all lap positions. Correctly chased into the mortar joint above.
Step flashings up the chimney sides in Borough Green require soakers under each tile course and correctly-overlapping lead steps above. We install to Lead Sheet Association specification throughout.
Open valley lead on Borough Green properties — Code 4 minimum, Code 5 on steep-pitch high-flow valleys. Welted cross-joints every 1.5m maximum. Correctly lapped under tile courses.
Dormer cheek and apron flashings on Borough Green properties require careful dressing to the dormer frame and underlying tile. Failure at dormer flashings is common on 1970s-90s extensions throughout Borough Green.
If you have a persistent leak in Borough Green that has not been correctly diagnosed, we carry out an on-roof investigation and identify the flashing or tile cause. Free investigation with any repair booking.
We specify the correct lead code for every position — Code 3 is too thin for exposed work anywhere in Borough Green. Every quote states the lead code and joint method. If a quote doesn't — ask.
Lead flashing failure in Borough Green is accelerated by A25 road vibration progressively loosens chimney pot bedding mortar. The housing stock — 1970s-80s suburban estates on Quarry Hill and Nepicar Road — means the majority of lead work we attend in Borough Green is on pre-1940 properties where the original flashing specification was modest and has not been upgraded since.
The most common pattern on Borough Green properties: Code 3 flat-lapped lead installed 10-15 years ago is now splitting at lap joints and admitting water that tracks to a ceiling drip remote from the actual entry point. The correct fix is Code 5 with welted joints and a correctly chased top edge — this lasts 40 years in Borough Green's conditions rather than 10.
Call 0173 224 1138 for a free, no-obligation survey and written quote. We cover Borough Green and the surrounding area from our Tonbridge base.
Typical price ranges. All quotes are free, written and fixed-price. Call 0173 224 1138.
| Job Type | Typical Cost | Timescale |
|---|---|---|
| Chimney apron — Code 5 | £280–£480 | Half–full day |
| Full chimney system — Code 5 throughout | £600–£950 | 1–2 days |
| Valley re-lead — Code 5 (per metre) | £150–£250 | varies |
| Dormer apron + sides | £450–£850 | 1 day |
| Flashing re-chase + re-secure only | £150–£300 | Half day |
| Leak investigation + report | Free with repair booking | 1–2 hrs |
"North-facing chimney flashing failed twice in eight years. They specified Code 5 with welted joints — explained why previous repairs had failed. Three winters, completely dry."
"Valley re-lead on a period property — previous lead was Code 3 and had only lasted nine years. New lead in correct Code 5 with welted seams. Completely watertight."
"Persistent leak above the landing — three roofers had looked, none found the source. These found a failed step flashing in 20 minutes on-roof. Fixed same day."
A25 road vibration progressively loosens chimney pot bedding mortar accelerates lead failure in Borough Green. Code 3 flat-lapped lead in exposed positions fails within 10-15 years. Code 5 with welted joints lasts 40+ years. We specify correctly as standard.
Code 5 (2.24mm) minimum on apron and step flashings. Code 4 on soakers. Code 5 or 6 on back gutters. We state the code in every written quote.
Yes — free leak investigation included with any repair booking. We inspect on-roof, identify the source, and quote the repair at the same visit. Call 0173 224 1138.
Chimney apron: £280–£480. Full chimney system: £600–£950. Valley re-lead: £150–£250/metre. Free written quote on 0173 224 1138.
If the lead has split at lap joints or is pulling from the chase, repair may extend life. If it is undersized (Code 3 on an exposed position), the correct fix is replacement in Code 5. We diagnose on-roof before quoting.
Code numbers refer to lead weight per m²: Code 4 is 1.78mm thick, Code 5 is 2.24mm. Code 5 is the minimum for apron and step flashings on Borough Green exposed chimney positions. Code 3 — commonly installed — is too thin for sustained weather loading and fails within 10–15 years.
10-year written workmanship guarantee on all lead work we carry out in Borough Green. Correct specification is also the best long-term guarantee — Code 5 with welted joints lasts 40+ years.
No call-out fee. No obligation. We serve Borough Green from our Tonbridge base.
0173 224 1138 ✉ Email Us