Can lead flashing be repaired?

A leak at the chimney rarely means the lead has failed. Most flashing faults are repairable in place, and knowing which ones are saves stripping a sound sheet.

Scott has spent more than 36 years on Surrey roofs and every repair carries a 25-year written workmanship guarantee. Whether you need lead work & flashing or lead work & flashing in Godalming, we cover the whole area.

Call 07428 300474 any time and a real person will answer.

Can lead flashing be repaired?

Yes, lead flashing can usually be repaired rather than replaced. Splits, lifted edges, failed pointing and pinholes are all fixable in place, and a sound sheet with one localised fault does not need stripping out. Replacement is only sensible once the lead has thinned, fatigued along its whole length or been cut too short from the start.

The faults that respond to repair

Most leaks blamed on flashing come from a handful of predictable failures. Mortar pointing at the chimney or abutment shrinks and drops out, so water runs behind the upstand instead of over it. Clips work loose and the free edge lifts in wind. Nail sickness at the fixings leaves small holes that weep slowly. Thermal movement opens a hairline split across a bay that was laid too long, usually where somebody has run a single continuous piece where two shorter pieces were needed.

All of those are repairable. Repointing into a raked-out chase with the correct mortar mix, redressing the upstand back into the joint, replacing lost clips and lead-welding a split with matching sheet will each restore the detail without touching the surrounding tiles or slates. Lead is also forgiving: it can be dressed, cut and welded on site by someone who works with it regularly, which is why a competent repair often outlasts a rushed replacement done in the wrong thickness. Whether you need lead work & flashing or lead work & flashing services Guildford, we cover the whole area.

Lead Sheet Association guidance underpins all of this. It sets the bay lengths, the codes of lead for each detail, the lap dimensions and the fixing centres that stop the same fault returning. Repairs that ignore those figures tend to fail in the same spot within a couple of winters.

When the sheet has reached the end of its life

There is a point where patching stops being honest. Lead that has been repeatedly reworked, or that shows a run of fatigue cracks parallel to the wall rather than one isolated split, has usually lost its ability to move. The same applies where the original code was too light for the exposure, where the sheet has been laid in one long unbroken run, or where a previous repair used mastic and sealant smeared over the top instead of proper welded work. Sealant hides a fault for a season and traps water underneath for years.

Look also at what sits behind the lead. If the chimney brickwork is spalling, the flaunching has broken up or the mortar joints have opened across a whole face, the flashing is not the real problem and replacing it alone will not stop the damp. In those cases the chimney work and the leadwork are one job, done in the right order. Whether you need lead work & flashing or lead work & flashing services Woking, we cover the whole area.

Age alone is not a reason to replace. Lead installed properly to the right code can run for a century, and plenty of Surrey roofs still carry original sheet that only needs its pointing renewed. The test is condition and detailing, not date.

What a proper inspection settles

The honest answer to repair or replace comes from looking closely, not from a guess at ground level. A flashing inspection covers the depth the upstand is turned into the joint, the state of the chase and pointing, the number and condition of clips, the lengths of the individual bays, the laps between them and the code of the lead itself. It also checks whether the water is even coming through the flashing, because slipped tiles, a failed soaker, a cracked valley or a blocked gutter all produce a stain in the same place on a ceiling.

That is why the survey is free and why a drone view is used where the detail sits high on a chimney or behind a parapet. Seeing the joint properly avoids the two expensive mistakes: stripping sound lead that needed nothing more than repointing, and patching a sheet that was always going to fail again. If you are searching for a roofer near you across Surrey and the Wey Valley, Scott answers the phone himself and will tell you which of the two your roof needs.

• A split, a lifted edge or lost pointing is a repair, not a replacement.
• Fatigue cracking along a whole bay means the sheet has run its course.
• Sealant over lead is a symptom of a bad previous repair, not a fix.
• Damaged brickwork behind the flashing has to be dealt with at the same time.

How the repair is carried out and guaranteed

A repair starts by raking out the old mortar back to a clean chase rather than skimming new pointing over crumbling material. The upstand is dressed back in, wedged and repointed. Splits are lead-welded with matching sheet, never soldered or filled. Where a bay is too long it is cut and reformed into correct lengths so the lead can move without tearing again. Clips are renewed in the same code so they do not tear the sheet they are holding.

Fixings and detailing follow BS 5534 for wind uplift where tiles or slates are disturbed to reach the flashing, and any ventilation path opened up during the work is put back so BS 5250 is satisfied and condensation does not appear where a leak used to be. Rainwater routes are checked at the same time, because a flashing repair on a roof that overflows at the gutter simply moves the wet patch.

Every repair carries the same 25-year written workmanship guarantee as a full new roof, handed over in writing before the team leaves. Small jobs get the same paperwork as large ones. If a repair will do, that is what gets quoted, in writing, at a fixed price, with no charge for the survey and no obligation. Scott has spent more than 36 years on Surrey roofs and would rather repoint a chimney flashing than sell a re-roof nobody needs.