Lead Work in Waterbeach

Expert Lead Work
in Waterbeach

Why Lead Work Matters on Your Roof

Lead flashing is the barrier between your roof covering and any vertical surface it meets: chimney stacks, parapet walls, dormers, flat roof upstands and roof valleys. When it is correctly fitted using code 4 or code 5 lead sheet dressed to British Standard, it is one of the most durable materials in roofing. When it fails, the water it was keeping out finds its way into the roof structure, the ceiling and, eventually, the rooms below.

We install and repair lead flashings across Waterbeach and the wider Ely area.

Repair or Replace: How to Think About It

This is the central question with lead work, and the honest answer depends on the condition of what is already there, not a blanket rule either way. Both options have legitimate uses, and a contractor who always recommends one over the other without inspecting the lead properly is not giving you good advice.

Repair is the right choice when the lead sheet itself is in sound condition but a section has lifted, a clip has pulled free, or the mortar pointing in the chase has failed and allowed movement. In these cases, re-dressing the existing lead, re-fixing it properly and re-pointing the chase is entirely appropriate and much more cost-effective than unnecessary replacement.

Replacement is necessary when the lead has cracked through thermal fatigue, has corroded or thinned to the point where it no longer holds water, or when it was installed incorrectly in the first place and no amount of repair will make it perform properly. A common example is lead that was laid as a single unjointed run longer than 1.5 metres. Lead expands and contracts with temperature, and without proper joints every 1.5 metres, it will crack. Repairing a crack in lead that will simply crack again in the same place is not a fix.

Signs That Repair Is Enough

• The lead sheet is still the correct thickness for its position and shows no cracking or pitting across its surface.
• The problem is localised: one lifted section, one failed mortar joint, one clip that has come away.
• The lead was correctly installed originally (proper code, correct jointing, good depth in the chase) and has simply been disturbed by settlement or weather.
• The mortar chase is intact and can be re-pointed after the lead is re-dressed.

Signs That Replacement Is the Better Option

• The lead is cracked at multiple points, particularly on long runs where thermal movement was not accommodated.
• The surface has oxidised unevenly or the lead feels thin and brittle.
• The original installation was substandard: too shallow in the chase, laid over a mortar fillet rather than into a proper cut chase, or fixed with nails alone on long runs.
• The flashing has been repaired more than once already and keeps failing in the same area.
• New lead flashing sealant has been applied over previous repairs, masking rather than resolving the underlying problem.

What Replacement Actually Involves

A proper lead replacement starts with stripping out the old material, including removing any old mortar or sealant from the chase. The chase depth is checked: a minimum of 25 mm is needed to anchor the lead correctly. The masonry or substrate is assessed, because fitting new lead to a chimney with failing pointing or crumbling brickwork is a short-term fix at best.

New lead is cut to length with joints every 1.5 metres on longer runs. Code 4 sheet (1.8 mm) is standard for most step and cover flashings. Code 5 (2.24 mm) is used for chimney back gutters, wide valley gutters and anywhere that greater width or durability is needed. The lead is dressed into the chase, fixed with lead clips or wedges, and the chase is re-pointed with a mortar mix appropriate to the masonry.

For valleys, the old lead or felt valley liner is removed, the valley boards are checked and replaced if necessary, and new lead is laid in sections with proper laps. A lead valley gutter typically needs to be wide enough to accommodate the anticipated water flow without overtopping in heavy rain.

What Does Lead Work Cost?

UK pricing for lead work varies by scope and access, but as a guide: a chimney flashing repair (re-dressing one or two sections and re-pointing) typically costs £150 to £350. A full chimney re-flash with new code 5 lead all round is usually in the range of £500 to £1,000 or more, depending on the size of the stack and the difficulty of access. Lead valley replacement is generally priced per metre and typically runs from £100 to £200 per linear metre, sometimes more on complex or large-scale work.

Repair is nearly always cheaper in the short term, but if the underlying installation was poor, it may cost more overall than doing a proper replacement now. We can inspect your existing lead and tell you honestly which approach makes sense for your property before any work is agreed.

Getting It Right First Time

The most expensive lead work job is the one that gets done twice because the first contractor patched rather than fixed. Whether your property is in Waterbeach or a neighbouring village, the same principle applies: get a proper inspection, understand what you are being quoted for, and make sure the contractor can explain why they are recommending repair or replacement for your specific situation.

Call us for a roof survey in Waterbeach. We will get up and look at the lead properly, tell you what we find, and give you a straight answer on whether repair or replacement is the right call.