Thetford Roofers provides full roof replacements in Brandon, covering every stage from stripping the old covering to completing the ridge, valleys and all leadwork.
A roof rarely announces that it needs replacing with a single, dramatic failure. Most homeowners in Brandon and the surrounding area reach the decision after years of recurring repairs that never quite solve the underlying problem. Understanding the warning signs - and what is driving them - makes it easier to decide whether a repair will hold or whether a full replacement is the right call.
Thetford Roofers covers Brandon and the surrounding area. We manage full roof replacements from start to finish: scaffolding, strip-off, timber inspection, new underlay, new battens, covering, all leadwork, ridges, verges and site clearance.
Some signs are obvious from the ground. Others only become clear when you look in the loft or get up on the scaffold. The most telling ground-level signs include:
From inside the loft, look for damp patches on the felt, mould on the insulation, daylight visible through the roof boards, or a smell of damp without an obvious source. Water tracking along a rafter before it drips means the entry point is often higher up the roof than where the damp appears inside.
Understanding the cause helps you assess the urgency. A single slipped tile after a storm is a repair job. Multiple slipped tiles on a roof where the battens are 50 years old point to a different problem: the battens have decayed and no longer hold the nibs on the tiles securely. Re-fixing one tile on rotten battens is a short-term fix at best.
Ridge mortar failure is extremely common on roofs of a certain age. Bedding mortar is exposed to frost every winter. Each freeze-thaw cycle forces a little more moisture into the joints. Over 20-30 years the mortar becomes friable and eventually crumbles. When ridge tiles are loose, they let water into the roof under wind pressure even when they have not yet moved enough to be visible from the ground.
Cracked concrete tiles are often caused by the same frost action, but they can also result from foot traffic - particularly from previous roof work where tiles were walked on incorrectly. A cracked tile does not always let water straight through, because the underlay beneath it offers some protection, but once the underlay is also aged and brittle, a cracked tile is an active entry point.
Lead flashings fail for several reasons. The most common is thermal movement. Lead expands and contracts with temperature and, over decades, the repeated movement works it loose from the mortar joint it is tucked into. A flashing that is lifting at the top edge will let water behind it every time rain hits the wall above. Applying sealant over a lifting flashing does not address the movement; the sealant cracks with the next thermal cycle.
Valley failures are often the last thing homeowners notice because valleys are harder to see from the ground. A valley carries a large volume of water from two roof planes and any debris that accumulates there blocks the flow. Lead valleys crack with age. Mortar-bedded valley tiles develop the same freeze-thaw crumbling as ridge mortar. A slow valley leak can run behind a wall for a long time before it appears anywhere visible inside.
A roof can look tidy from the pavement and still be close to the end of its useful life. The covering on top is only part of the picture. The roofing felt beneath the tiles was originally a bitumen-based sarking felt, and on roofs laid before the mid-1990s it has almost certainly become brittle and fragmented. When that felt fails, any water that gets past a tile - whether through a crack, a slipped section or a poor flashing - goes straight onto the timber. The felt is the last line of defence, and on an older roof it is often already gone.
Battens on roofs of 40 years and older are frequently found to be rotten when stripped, even when the tiles above looked acceptable. The batten carries the weight of the tile and transfers it to the rafter; a rotten batten cannot do that reliably. This is why a proper assessment of a roof involves more than looking at the tile surface.
After scaffolding is in place, the old covering is stripped back to the rafters. This is when the timber structure is properly assessed. Rotten or damaged battens are removed entirely. Rafters with localised decay - most often at their feet near the eaves or at valley and chimney junctions - are either sistered with new timber alongside the existing rafter, or replaced where the damage is extensive.
New breathable underlay is laid across the rafters and fixed down before new treated battens go on. The covering is then laid from eaves to ridge. Ridge tiles are bedded in mortar or fixed with a dry-fix mechanical system. Dry-fix ridge systems have become more popular because they do not rely on mortar and so do not suffer the same freeze-thaw failure over time. Verges are finished in either mortar or proprietary dry verge units depending on what the homeowner prefers and what the original detail was.
All valley and chimney work is completed in lead. Lead that is cut into the mortar joints of a chimney stack and properly secured with lead plugs will move with the stack and stay watertight far longer than any sealant alternative. The scaffold is inspected before it comes down and any final checks made from the elevated platform before access is removed.
A full roof replacement on a standard semi-detached house typically costs between £5,000 and £12,000. The final figure depends on the roof area, the material chosen, the number of chimney stacks, valleys and dormers, and the condition of the timber found during the strip. Natural slate costs more per square metre than concrete interlocking tiles but lasts considerably longer. Where significant rotten timber is found, the additional cost of replacing it is unavoidable - it cannot be left and covered over.
Before agreeing to any roof replacement work, it is reasonable to ask:
A roofer who can answer these questions clearly before work starts is one who has thought through the job properly. If the answers are vague, that is worth pausing over.
We work across Brandon and into the surrounding area. Call us to arrange a roof survey. We will go up, assess the structure properly and give you a straight answer on whether a replacement is the right decision or whether repairs will genuinely extend the life of what you have.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
