Lead Work in Downham Market

Expert Lead Work
in Downham Market

What Lead Work Actually Involves

Lead work covers all the junctions where your roof meets a vertical surface - a chimney stack, a dormer wall, a parapet, or a roof window. At these points, plain tiles or slates cannot make a watertight seal on their own. Lead is dressed, cut and fixed to bridge the gap, and when it's done properly to BS EN 12588 standards, it can outlast the roof covering itself. When it's done badly, it is one of the most reliable sources of slow, hidden leaks.

The main types of lead work you'll encounter on a typical house are step flashings (which follow the line of a chimney or dormer wall in steps), back gutters (a horizontal lead gutter behind a chimney), apron flashings (a single sheet lapped over the front of a chimney), soakers (small pieces of lead tucked under each slate or tile alongside a chimney or abutment), and lead valleys (running between two roof slopes). Each one requires a different technique and a different lead code - code 3 for soakers, code 4 or 5 for most flashings, code 5 or 6 for valleys and back gutters.

Why Poor Lead Work Causes So Many Leaks

Lead is a soft, malleable metal. It expands in warm weather and contracts in cold. If a roofer cuts the joints too tight or fails to allow for thermal movement, the lead cracks or lifts over a few winters. If the lead is fixed with too many nails, the same thing happens. A common problem is lead that has been pointed over with mortar rather than properly dressed - the mortar eventually cracks away and lets water straight in behind the flashing.

Another frequent cause of failure is using lead that is too thin for the application. A code 3 sheet used where code 5 is needed will corrugate, ripple and eventually split. You can't always see this from the ground, but a competent roofer can identify it immediately on inspection.

How to Choose a Contractor in Downham Market

Lead work is a skilled trade. It is not the same as general roof repairs, and not every roofer who lays tiles is equally competent at dressing lead. Before you agree to any work, it is worth asking a few specific questions to separate contractors who understand the craft from those who are less experienced.

Ask these before you commit:

• What lead code will you use, and why? A confident roofer will give you a straight answer and explain the choice. If they can't, that's a warning sign.
• How will you fix the flashing? Lead should be fixed at the top, folded into a raggle (or tucked into a mortar joint), and left free to move at the bottom. Ask them to explain their fixing method.
• How will you allow for thermal movement? Each individual piece of lead in a step flashing should be no longer than 1.5 metres. Ask whether they lap the joints and how they deal with expansion.
• Will you re-point the mortar joints after dressing the lead? If they're removing old pointing or cutting new ragged joints, the mortar work is part of the job - confirm it's included.
• Will you remove all the old lead? Some contractors overlay new lead on old, which can cause problems. Understand what they're planning to do with the existing material.
• Can you show me your work on similar properties? Photos of previous chimney stacks or dormer details are reasonable to ask for.

What a Written Quote Should Include

A quote for lead work should specify the type of flashing (step, apron, back gutter, valley), the lead code, the approximate area or length, and any associated work such as re-pointing, tile or slate lifting and re-bedding ridge tiles. Vague quotes that simply say "chimney repair" leave you with no way to compare prices or hold a contractor to account if the work is substandard.

If a contractor is quoting by phone without looking at the job, be cautious. Lead work almost always requires a proper inspection because the extent of the problem is rarely obvious until the old lead is removed.

Spotting Trouble Before It Becomes Expensive

From the ground, a few signs suggest the lead work on your property needs attention. Mortar that has cracked away from the junction between a chimney and the roof slope is a clear indicator. Lead that has visible splits, a greenish-white powdering (lead carbonate) along a crack, or that has clearly lifted away from the wall at any point should be inspected. Staining on an interior ceiling near a chimney breast, dormer or roof window is the most common domestic result of failed lead work.

The difficulty is that a slow lead leak often runs along a rafter for some distance before it drops onto a ceiling, so the stain may not be directly below the fault. A roofer carrying out a proper inspection will trace the water path back to the source rather than simply patching the most obvious point.

What the Work Involves on the Day

A straightforward chimney flashing replacement typically takes one to two days for a competent team. The roofer will strip the old lead and any bedding mortar, inspect the underlying masonry and tiles, dress the new lead to shape, tuck it into the raggle joints and re-point. If any tiles or slates have been disturbed, they should be re-laid before the scaffolding or access equipment comes down.

More complex jobs - such as a large back gutter, a long valley, or a dormer with multiple junctions - will take longer. If a chimney stack also needs repointing or has loose brickwork, that work should be carried out at the same time, not deferred. Doing it separately means hiring access equipment twice.

Call Us for a Lead Work Survey

If you've noticed a damp patch near a chimney or roof junction in your Downham Market home, call Brandon Roofers for a proper survey before the leak causes any more damage.