Thetford Roofers carries out roof repairs for homeowners in Brandon, diagnosing and fixing everything from slipped slates and failed flashing to ridge tile failures and flat roof defects.
Most roof repairs that turn into large jobs started as something smaller that was not acted on in time. The difficulty is that a roof in the early stages of failure often gives signals that are easy to miss or dismiss. Knowing what those signals look like - and what causes them - puts you in a much better position to catch problems when they are still straightforward to fix.
We carry out roof repairs for homeowners in Brandon and the surrounding area, working out of Thetford. Our work covers replacing slipped or cracked slates and tiles, re-bedding mortar ridge and hip tiles, resealing and re-dressing lead flashing, repairing valley gutters, and repairing flat roof sections over extensions and bay windows. Small repairs are best done promptly, before water gets in, and we provide a written condition report on the rest of your roof so you know what else to watch.
A displaced or missing tile is obvious. The subtler signs matter just as much. A ridge line that is no longer straight when viewed from the end of the garden suggests mortar ridge tiles are working loose - they may still be sitting in place, but the bond underneath has broken and they can lift in wind. Mortar ridge failure is one of the most common causes of sudden tile displacement during storms.
Moss and lichen on a pitched roof is not automatically a structural problem, but a heavy covering that is pushing up under tile edges or lifting the leading edge of slates indicates that moisture is being held against the tile surface for long periods. Over time this accelerates the freeze-thaw cycle that cracks tiles and erodes mortar. It also tends to clog the drainage channels between tiles, forcing water sideways and downward in ways the roof was not designed for.
Lead flashing that has pulled away from the masonry at the top edge - even by just a few millimetres - creates a gap that water enters directly. From ground level, a grey hairline gap along the top of a lead apron at a chimney stack or a dormer is a reliable sign that the chase has opened up or the lead has not been secured properly. Fresh sealant applied over the gap is a short-term measure; the only lasting fix is to re-dress the lead and re-point the chase into the masonry.
Verge mortar (the mortar that finishes the edge of the roof at a gable end) cracks away from the tile or the bargeboard over time, particularly on exposed elevations. Once a section of verge mortar drops away, the tiles at that edge have nothing to hold them laterally and they can slip outward. The gap also lets water and wind into the roof structure at the edge, which is a direct path to the timbers.
A damp patch or tide mark on a ceiling is the most obvious internal signal, but the location of the stain is often misleading. Roof leaks rarely fall straight down from the entry point. Water enters through a faulty tile or failed flashing, then travels along the underside of the roof deck, down a rafter or along a batten, until it finds a low point. The drip may appear a metre or more away from the actual fault - horizontally as well as vertically.
A dark mark running along the side of a chimney breast, inside the loft rather than in the room below, points toward the flashing or the mortar haunch at the stack rather than the tiles themselves. A stain that appears only after sustained heavy rain but not a brief shower is a strong indicator of a slow drainage failure - perhaps a blocked or partially collapsed valley gutter that only backs up when rainfall exceeds the reduced drainage capacity.
Wet loft insulation that has no obvious source - no visible gap in the tiles above it, no condensation trail - is worth investigating carefully. It may indicate that water is entering at a point away from the wet insulation and travelling along a rafter before soaking into the quilt. It can also indicate a ventilation problem causing interstitial condensation rather than a true leak, and these two causes require different responses, so identifying which one applies matters before any repair is started.
Overflow at the fascia - water streaming down the outside of the wall during rain rather than through the downpipe - means the gutter is full before the rain stops. That water does not all go away from the building. Some of it wets the top of the fascia board repeatedly, soaking the rafter feet over time, and some backs up under the lowest course of tiles. Rafter foot rot caused by a long-term overflowing gutter is a structural repair, not a minor job.
Understanding the cause helps you judge urgency. Mortar ridge failure is caused by the natural breakdown of sand-and-cement mortar over time, accelerated by freeze-thaw cycles. A mortar ridge that was laid 20 or more years ago will typically need re-bedding; this is maintenance, not a sign of a poor original installation.
Slate nail failure - where the nail corroding through causes the slate to slip down and rest on the one below - is common on roofs with original or early replacement slates. The slate itself may be sound, but it cannot be re-fixed in the same nail hole without a proper clip or rivet fix. Slates repaired by pushing them back up and wedging them are not a permanent solution.
Lead flashing failure is usually caused by one of three things: the lead was not chased deep enough into the mortar joint and has pulled free; the lead was not properly formed to the profile of the tiles below and relies on sealant to bridge the gap; or the lead has reached the end of its serviceable life through fatigue cracking, which typically shows as hairline cracks across the face of the lead in areas that flex repeatedly in wind.
Flat roof failures over extensions and bay windows are most often caused by the felt membrane splitting or delaminating at the seams, or by ponding water where the drainage outlet has partially blocked and the membrane has been permanently underwater. An EPDM rubber membrane, properly laid and bonded, resists ponding better than felt and lasts longer at roof junctions, but any flat roof system will fail eventually without periodic inspection.
Before a price is given, we identify the actual entry point rather than the point where water is showing inside. We look at the roof section above the stain and then at junctions - where roof planes change angle, where a flat roof meets a wall, where the chimney stack sits in relation to the slope. Drainage routes matter too: we follow the path water would take if it could not escape normally, and look for signs that it has been doing exactly that.
If access to the loft is possible, marks on rafters and battens can tell a lot about how long water has been entering and roughly from which direction. That information changes the repair scope: a timber that has been wet for a long time may need more than just a tile replacement above it.
Replacing a small number of slipped or cracked tiles typically costs between £150 and £350, depending on tile type, pitch and access. Re-bedding a full mortar ridge on a standard semi-detached house usually falls between £400 and £800. Lead flashing repairs range from around £150 for a re-seal to upwards of £500 for a full re-dress with re-pointing. Flat roof repairs vary by membrane type and the size of the affected area. These are current typical UK ranges - every job is priced on what we actually find.
If you have noticed any of the signs described above - inside or out - it is worth arranging a roof survey. We cover Brandon, Thetford and surrounding areas. We will identify the cause, tell you clearly what needs doing now and what can wait, and leave you with a written report on the condition of your roof.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
