Lead Work in Worstead

Expert Lead Work
in Worstead

What Lead Work Actually Does on Your Roof

Lead flashing and weathering seals the joints where your roof meets a vertical surface - around chimneys, where a dormer wall meets the slope, along valley gutters, and where a pitched roof butts up against a parapet wall. These are the points where two different materials meet at an angle, and no tile or slate on its own can keep water out there. Lead is cut, dressed, and fixed in sections to bridge that gap and direct water away. Done correctly to the right Code specification, it forms a watertight seal that flexes with temperature changes without cracking.

We carry out lead flashing repairs and full replacements across Worstead and the surrounding villages, including North Walsham, Stalham, Trunch, Mundesley, and Horning.

The Warning Signs You Should Not Ignore

Most lead failures do not look dramatic from the ground. By the time you can see a problem clearly from your garden, water has usually been getting in for some time. The signs to watch for are often subtle, and some appear inside the property rather than on the roof.

• Damp patches on a chimney breast - particularly on the upper sections of an interior chimney wall, these are very often caused by failed step or cover flashing rather than a cracked flue or porous brickwork.
• Brown tide marks on a ceiling below a skylight or dormer - if the staining returns after painting, the flashing is the first thing to check.
• Visible gaps or lifted sections of lead - lead expands and contracts with temperature. Over years, this movement can pull the top edge out of the mortar joint it sits in, leaving a gap that opens every time it rains.
• Cracked or crumbling mortar pointing around lead joints - the mortar that holds the top edge of lead (called the chase or raggle) breaks down over time. When it does, water tracks straight behind the flashing.
• White staining (efflorescence) on chimney brickwork - this chalky residue is a sign that water has been getting into the masonry and evaporating back out through the surface. Failed flashing is a common cause.
• Lead that looks thin, brittle, or has small holes - old lead can oxidise heavily or be damaged by foot traffic. Very thin sections can split or perforate, especially on older properties where a lightweight Code 3 lead was used where Code 4 or 5 was needed.
• Patched repairs using mortar or mastic - a previous owner may have had a bodged repair done. Mortar and sealant applied over flashing joints are a sign that the lead itself was not properly replaced when it should have been.

What Causes Lead Flashing to Fail

Lead is one of the longest-lasting roofing materials available, but it does not last forever, and some things shorten its life considerably. Understanding why failures happen helps you ask the right questions before work starts.

Thermal movement: Lead expands in heat and contracts in cold. A length of lead that is too long with no expansion allowance will buckle, crack at its fixings, or pull away from the masonry it is sealed into. Correctly installed lead is cut in sections of no more than 1.5 metres to allow for this movement. Longer sections are a classic sign of poor workmanship.

Wrong Code specification: Lead is sold by Code number, which relates to its thickness. Code 3 (1.32mm) is too thin for most exposed flashing positions and is sometimes used to cut costs. Valley gutters and soakers generally need Code 4 or Code 5. Using the wrong Code leads to early failure, particularly in areas exposed to wind-driven rain.

Mortar failure in the chase: The top edge of most flashings sits in a horizontal chase cut into the mortar joint of brickwork, then the chase is repointed to lock it in. If the pointing is done with the wrong mix - too hard, for example - it will crack away as the lead moves. The right mortar mix for repointing lead chases is softer than the standard mix used on brickwork generally.

Oxidation and age: Lead develops a natural oxide layer (patina) that actually protects it. But in some conditions - particularly where moss or lichen growth holds moisture against the surface - lead can pit and thin over decades. A flashing that is 50 or 60 years old may simply have reached the end of its serviceable life.

Physical damage: Lead on a flat section, such as a chimney cap or a dormer top, can be dented or cracked by someone walking on it during other roofing work. A single split in a flat lead sheet will let in a surprising amount of water before it is spotted.

Tree debris: Leaves and organic matter sitting on lead can hold damp and accelerate surface deterioration. Valley gutters lined with lead are particularly vulnerable if they are not kept clear.

Repair or Full Replacement?

Not every lead problem requires a full replacement. A section of lead that has simply lifted from its chase can often be re-dressed and re-pointed at relatively low cost. But if the lead is the wrong Code, has been repaired with mastic before, or is thinning with age, patching it is a short-term fix that will cost more in the long run.

A good roofer will tell you honestly what is worth repairing and what needs replacing. Ask to see the old lead once it is off - the thickness and condition should be obvious. If it is being replaced, ask which Code is being used and why. For a chimney on a typical pitched roof, Code 4 step flashing and Code 5 soakers is a common and appropriate specification.

Which Roofs Are Affected

Lead work is relevant on almost any roof type - tiles, slates, flat felt or EPDM sections, and older heritage roofs alike. Dormer windows are a common source of lead problems, particularly where the dormer cheeks meet the main roof slope.

We cover lead work repairs and replacements across North Walsham and into the wider Norfolk area, including Stalham, Horning, Marsham, Overstrand, Mundesley, Trunch, and beyond. If you have spotted any of the warning signs described above, call us to arrange a roof survey so we can give you a clear picture of what needs doing and what it will cost.