North Walsham Roofers carries out roof repairs in Norwich and the surrounding area, tackling leaks, failed flashings, slipped slates and flat roof problems on all types of home.
Most roofing problems do not appear from nowhere. There are usually signs weeks or months before water gets into the house, and knowing what to look for can save a significant amount of money and disruption. This page explains the warning signs a homeowner can spot, what causes each of them, and what a proper repair involves once a roofer is on site.
A roof repair can be as straightforward as replacing one cracked tile or as involved as tracking down a leak that has been working through the felt and into ceiling timbers for months without being noticed. The most common repair work falls into a few categories:
The roof is out of sight for most of the year, which means early warning signs are easy to miss. A check from ground level twice a year, using binoculars if you have them, takes minutes and can catch problems before they develop into something serious.
A tile sitting out of alignment with its neighbours is one of the clearest signs of a problem. On a concrete or clay tile roof, slippage usually happens because the nibs on the back of the tile have broken, or because the tile batten beneath has rotted. On a slate roof, the most common cause is nail sickness: the iron nails used to fix slates can corrode over decades until the slate is held only by friction, at which point wind or frost finishes the job.
A single slipped tile matters because it exposes the sarking felt beneath to direct rain. Modern breathable felt is more resilient than the older bitumen-based felt found on roofs from earlier decades, but neither is designed to be a long-term replacement for the tile covering above it. Old felt can fail quickly once exposed, turning a small repair into a much larger one.
Ridge tiles sit at the apex of the roof and are held in place by mortar bedding. That mortar is exposed to frost, rain and UV on all sides, so it tends to fail before the tiles beneath it. Gaps in the mortar allow wind to get underneath, which can lift ridge tiles entirely in a storm. Crumbling or missing mortar is visible from the ground and is one of the more urgent signs, because a dislodged ridge tile can cause damage to the roof surface below as well as creating a direct entry point for water.
Re-bedding ridge tiles is a standard repair that involves removing the tiles, cleaning off the old mortar, checking the tiles themselves for cracks, and re-bedding with fresh mortar to the correct mix and profile. Some roofers use a dry-fix mechanical system instead, which avoids future mortar failure at the cost of higher materials.
Lead flashing seals the junction between the roof covering and any vertical surface it meets: chimney stacks, party walls, dormer cheeks, skylights and roof windows. When flashing fails, water runs down the vertical face and directly into the roof structure, often without being immediately visible inside the house.
Flashing fails for a few reasons. On chimneys, the flashing is typically cut into a mortar joint in the brickwork and then wedged and pointed in place. Over time, that pointing shrinks or cracks, and the flashing lifts. On flat-to-pitched junctions above bay windows, the flashing has to follow an awkward angle, and shoddy original installation is a common cause of persistent leaks in these locations.
A warning sign of flashing failure is a damp patch on the wall or ceiling just below or beside a chimney breast, on the wall shared with a neighbour, or on the ceiling directly above a bay window. The damp often appears only after sustained rain rather than a single shower, which leads homeowners to assume the roof is sound when it is not.
A sealant repair to flashing is a short-term measure. Properly replaced lead flashing, correctly dressed and pointed, is the lasting solution. Lead is the material of choice because it is flexible, long-lasting and can be shaped to fit almost any junction accurately.
A dark or yellow-brown stain on a ceiling is the point at which most homeowners first call a roofer. By that stage, water has usually been entering the roof for some time. The delay between entry and visible staining depends on how much insulation is above the ceiling, how slowly the water is coming in, and how saturated the felt and timbers have become.
A stain directly below a chimney usually points to the flashing. A stain in the middle of a ceiling, away from any obvious roof feature, is more likely to be a cracked or slipped tile with failing felt beneath. A stain on an external wall, at high level, can indicate a blocked or overflowing gutter pushing water back under the eaves, rather than a roof fault as such.
Identifying the cause before carrying out the repair is the only way to fix a leak properly. A roofer should be able to explain to you what they found and why it is the source of the problem, not just what they replaced.
Moss retains moisture, which accelerates frost damage to tiles and points, and can eventually lift tiles slightly at the edges as the root structure develops. Heavy moss coverage is therefore worth addressing, but the method matters. Pressure washing a roof surface forces water under tiles and can dislodge ridge mortar, creating new problems. The correct approach is biocide treatment followed by manual removal once the moss is dead and dry, then a further inhibitor treatment.
Lichen is harder to remove than moss and grows into the tile surface rather than sitting on it. Old lichen staining does not necessarily indicate a structural problem, but active growth in a valley or at the base of a chimney can contribute to drainage issues over time.
Flat roofs on extensions, outbuildings and garage roofs give different warning signs from pitched roofs. Visible blisters or bubbles on a felt surface indicate that moisture has been trapped beneath and is expanding in warm weather. Splits or open joints at the edge of the roof or around upstands are direct entry points for water. Ponding water after rain is not always a crisis, but persistent standing water shortens the life of the membrane significantly.
An EPDM rubber roof in good condition has no visible splits, the seams are bonded flat, and the edges are secured tightly to the upstand or drip edge. Any lifting at the perimeter warrants investigation.
We cover Norwich and the surrounding area. If you have spotted something that does not look right, call us to arrange a roof survey. We will tell you what is causing the problem, what the repair involves, and what it will cost before any work begins.
Call us for a roof survey in Norwich and get a clear diagnosis before the problem gets any worse.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
