North Walsham Roofers fits and repairs lead flashing for homeowners in Holt, and this page explains how to keep that lead in good condition long after the work is done.
Lead flashing seals the junctions between your roof covering and anything that breaks through or meets it - chimneys, dormers, skylights, and valleys. These are the points where water is most likely to find a way in if the sealing material fails. Lead is the traditional and still most reliable material for this purpose because it can be dressed tightly into masonry, it tolerates movement, and it has an exceptionally long service life when fitted correctly to the right Code specification.
Code 4 and Code 5 lead are the standard grades for chimney step flashings and back gutters. Valleys are typically dressed in Code 5. Each piece is cut to length, shaped with a dresser or mallet, chased into mortar joints, fixed with clips, and pointed. Done properly, lead work is as close to fit-and-forget as roofing gets - but it still benefits from occasional attention to stay that way.
When new lead is fitted, there are a few things to be aware of in the days immediately after the job. Fresh mortar pointing takes time to cure fully, typically 24 to 48 hours in dry conditions, longer in cold or damp weather. During that period it is worth keeping the area as dry as possible if the weather allows, though in practice a light shower is unlikely to cause a problem once the pointing has had a few hours to set.
New lead will have a bright, silvery appearance. Over time it develops a dull grey patina as the surface oxidises - this is entirely normal and is actually part of what makes lead so durable. You do not need to apply any coating or sealant to new lead to encourage or prevent this. Proprietary lead patination fluid is sometimes used by roofers to speed up the process and reduce the risk of lead carbonate run-off streaking brickwork or tiles in the short term. If your roofer applies this, it is cosmetic rather than structural.
Lead does not need annual professional attention, but a few minutes of observation from the ground - or from a photograph taken by a roofer during any other roof work - can catch a developing problem before it becomes expensive. Here is what to look for.
Lead valleys channel water from the roof into the guttering. They work properly only when the channel is clear. A build-up of moss, leaves, or wind-blown debris in a lead valley slows the drainage and encourages water to back up under the roof tiles at the edges of the valley. In winter, this backed-up water can freeze and force the tiles further apart.
Clearing debris from valleys is something many homeowners can do safely from the inside of a dormer window or from a loft hatch if the valley is accessible, but do not go onto the roof surface to do this. Moss treatments applied to the ridge will work their way down in rain and help keep moss from re-establishing in the valley over time, though a roofer should apply these rather than a homeowner from a ladder.
Gutters should be cleared at least once a year, ideally in late autumn after the leaves have fallen. Blocked gutters cause water to back up and sit against the base of chimney stacks and dormer cheeks - exactly the areas where lead work is most often found. Standing water in this position accelerates mortar deterioration and eventually leads to flashings lifting.
The most avoidable cause of premature lead flashing failure is neglect of the chimney stack itself. When the mortar joints on the chimney face (known as pointing) deteriorate, water soaks into the brickwork and gets behind the flashing. When chimney pots crack or chimney caps fail, water pours straight down the flue and saturates the masonry, causing the surrounding lead work to fail far sooner than it otherwise would.
Check the condition of the chimney cap or pot from the ground every year or two. If the cap has cracked or the mortar haunching around the pot base is crumbling, that is worth dealing with before it becomes a more expensive problem. A roofer visiting for any other work - replacing a few slipped tiles, for example - can usually inspect the chimney at the same time at no significant extra cost, since they are already on the roof.
Skylights and dormers each have their own lead detailing - typically a soaker course at the sides and a back gutter behind the unit. The leading edge at the top of a skylight is particularly vulnerable because debris washed down the slope accumulates there. An annual check that this area is clear of leaves and moss reduces the risk of water being held against the pointing long enough to work through it.
Condensation on the inside of a skylight frame is sometimes mistaken for a lead failure. If water appears on the glass or the inner frame in cold weather but the ceiling around the skylight is dry, the more likely cause is condensation rather than a flashing leak. A leak through failed flashing tends to produce staining on the ceiling or on the plasterwork around the skylight opening.
Minor observations noted from the ground should be raised with a roofer when they are next on the roof, or at least once every few years as a standalone check. Call sooner if you notice damp patches appearing on a ceiling or wall that seem linked to a chimney, dormer, or skylight position. The sooner a lead failure is identified, the less water damage accumulates in the roof structure. Wet timbers are far more expensive to address than a re-point or a reflash.
Lead work we have fitted around Holt, and across the wider area covering Sheringham, North Walsham, Mundesley, Stalham, Horning, Marsham, Overstrand, Lenwade, Rollesby, Martham, Trunch, and Norwich, follows the correct Code specifications and is installed to sit right for the long term. Good maintenance from the homeowner's side means it is likely to keep doing so.
If you have had lead work done recently and want a check after the first winter, or if you have not had your flashings looked at for several years and want peace of mind, call us to arrange a roof survey in Holt. We will inspect the lead and let you know its current condition and whether anything needs attention.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
