Lead Work in Thetford - Aftercare and Maintenance to Protect Your Roof

Expert Lead Work
in Thetford

Why Lead Work Needs Attention After It Is Fitted

Lead is one of the most durable roofing materials available. Correctly fitted sheet meeting BS EN 12588 can last 50 years or more, but only if it is looked after - and only if minor problems are caught before they become serious ones. The most expensive lead work failures are almost always ones that started small and were left untreated. Understanding what to look for and what to do about it is straightforward once you know what matters.

We carry out lead flashing, valley and soaker work from our base in Bury St Edmunds, serving Thetford and the surrounding area. All our work uses hand-dressed lead sheet and traditional techniques. But however carefully a job is done, the roof still needs a degree of attention over the years.

What to Do in the First Year After New Lead Is Fitted

Freshly dressed lead needs a short settling period. New lead has a bright, silvery appearance that weathers to a dull grey over the first year or two as it forms a natural patina. This weathering is normal and is part of what makes lead so durable - the patina itself is a protective layer.

During the first year, avoid applying any sealant, paint or coating to the new lead. Some homeowners are tempted to paint new flashings because the bare metal looks unfinished; this is not necessary and some coatings can interfere with the natural weathering process. Leave it alone. The one thing worth checking at around six months is that the mortar pointing at the top of each flashing - where the lead is tucked into the chase in the wall - is still intact. Fresh mortar can shrink back slightly as it cures. If it has pulled away from the edge of the lead, call a roofer to have it re-pointed before water finds its way behind the flashing.

Annual Checks: What to Look For Without Getting on the Roof

You do not need to get on the roof to carry out a useful visual check. From ground level with binoculars, or safely from a first-floor window where the roof is visible, look for the following at least once a year - autumn is a good time, before winter weather arrives.

• Lifting or bowing lead. Flashings that have started to lift away from the wall or chimney are visible as a gap or a shadow between the lead and the masonry. This usually means the fixing into the mortar joint has failed and water can now get behind the flashing.
• White staining on the lead. White powder or streaks on the surface of lead (called white lead carbonate) is normal and harmless in small amounts. Excessive white staining, particularly with orange-brown staining on the masonry below it, can indicate run-off from other materials is affecting the lead. It is worth noting to a roofer on their next visit.
• Cracks or bright lines across the surface. Thin bright lines running across the body of a flashing - particularly across the bends - are early signs of fatigue cracking. Caught early, the affected section can sometimes be replaced without touching the rest of the flashing.
• Mortar missing from around the top of flashings. At chimney flashings and wall abutments, the mortar that holds the top edge of the lead in place can crack and fall out. Once this happens the flashing is only held by friction, and it will eventually pull out entirely.
• Blocked valley channels. Valleys collect debris - leaves, moss, small twigs. A blocked valley cannot drain properly, water backs up, and it finds its way under the tiles. Keeping valleys clear is one of the simplest forms of maintenance a homeowner can do.

Clearing Debris From Valleys Safely

Keeping a lead valley clear of leaves and moss is something that can be done from a ladder by a competent adult - but only if the ladder is properly secured and you are not going onto the roof itself. Use a soft brush or a gloved hand to lift debris out of the channel; do not use a pressure washer, which can force water under tiles and damage the lead surface. If the valley has significant moss growth adhering to the lead itself, a roofer should treat it properly rather than it being scraped off, which can mark and thin older lead.

If you are not comfortable working at height, arrange for a roofer to clear valleys as part of an annual maintenance visit. This is a relatively low-cost service and the cost of a blocked valley causing water ingress is always much higher than a preventive clearance.

How Often Should Lead Work Be Professionally Checked?

For most homes, a professional check of all lead flashings, valleys and soakers every three to five years is sensible. After any significant storm - particularly one involving high winds or large amounts of debris - it is worth having a look sooner. Lead that has been dislodged by a falling branch or tile impact will not always be visible from the ground.

Older properties with lead that has not been replaced in living memory should be checked more frequently. Lead that is more than 40 years old and has never been professionally assessed may have areas of fatigue cracking or thinning that are not visible from below but that a roofer will spot on close inspection.

The Simple Maintenance Tasks That Avoid the Next Problem

Most lead work failures that result in water damage to a property were preventable. The problems that cause the most damage are usually the ones that start small - a mortar joint that failed, a lifted flashing that was not noticed, a valley that was never cleared. A straightforward maintenance routine keeps these under control.

• Check lead flashings visually from ground level each autumn
• Clear valleys of debris at least once a year, or arrange for a roofer to do it
• Have mortar repointing around flashings redone whenever it shows signs of cracking or shrinking back
• If you notice a new damp patch on an interior ceiling or wall below a chimney or valley, have it investigated promptly - do not wait to see if it gets worse
• Do not apply sealant, expanding foam or bitumen paint to lead without taking professional advice first

What to Do If You Spot a Problem

If your visual check turns up something that does not look right, call a roofer rather than leaving it. Water ingress through failed lead work gets worse quickly in wet weather, and the longer it continues the more damage it does to roof timbers, insulation and internal ceilings. A damp patch on a ceiling below a chimney stack almost always means the flashing has failed rather than the roof tiles - the tiles are usually fine and the repair needed is far less extensive than a full re-roof.

If you are in Thetford or nearby and would like a check on your lead work, arrange for a roofer to survey it. A roofer should give you an honest assessment of what is in good order and what needs attention, with no pressure to have work done if it is not needed yet.