New Roofs in Eriswell

Expert New Roofs
in Eriswell

When a repair is no longer enough

Most homeowners do not set out to replace a roof. The decision usually comes after a repair that did not hold, a survey that revealed more damage than expected, or a series of small problems that have been building up for years. Knowing what those warning signs look like early can save you a great deal of money and disruption.

This page covers what a full roof replacement involves, what to expect from the process and the costs, and crucially, the signs that tell you a new roof is the right call rather than another patch.

Warning signs that point to a new roof

A single slipped tile or a small patch of cracked felt is a repair job. But some signs indicate that the structure or covering has reached the end of its serviceable life, and continuing to repair it becomes false economy.

• Age of the covering. Traditional felt flat roofs typically last 10 to 20 years. Slate and clay tile pitched roofs can last much longer, but the mortar bedding, ridge tiles and flashing will need replacing well before the slates themselves give out. If the covering is original to a house built several decades ago and has never been replaced, it is worth having it assessed properly.
• Widespread moss and organic growth. A little moss on tiles is cosmetic, but heavy, deep-rooted growth across most of the roof surface breaks down pointing and tile surfaces over time. When the growth is holding moisture against the tiles and allowing frost to work into the substrate, you are looking at cumulative damage that repairs cannot reverse.
• Multiple leaks in different areas. One leak usually has one cause. If water is finding its way in at the chimney stack, at a valley and above a bedroom window all in the same winter, the covering itself is failing in several places at once. Patching each location individually rarely solves the underlying problem.
• Sagging or deformed roof planes. A flat or pitched roof that has started to sag is not just a surface problem. It usually means the decking or the timbers beneath it have taken on moisture and begun to rot or compress. Once the structure is compromised, a new covering alone will not fix it.
• Daylight visible in the loft. If you can see pinpricks or patches of light through the roof space on a bright day, the covering has gaps. Cold air, condensation and insects follow the same routes water does.
• Persistent damp patches on ceilings or walls. These do not always appear directly below the leak. Water tracks along rafters and joists before dripping. If damp patches keep returning after repairs, the source has not been properly identified or the covering is too far gone to hold.
• Granule loss from felt or mineral-surfaced coverings. On flat roofs with a mineral-surfaced cap sheet, heavy granule loss in gutters after rain is a sign the surface layer is breaking down and the waterproofing beneath it is exposed.
• Cracked or open ridge and hip mortar. When mortar along the ridge has shrunk, cracked and begun to fall away in sections, it is not just a pointing repair. It often means the whole ridge line needs re-bedding or dry-fixing, and at that point it is sensible to consider the condition of the full roof at the same time.

What causes roofs to fail

Understanding why roofs fail helps you ask the right questions when getting a replacement quoted. The most common causes are age combined with deferred maintenance, frost action, and original installation faults that have taken years to show themselves.

Frost is hard on roofs. Water enters tiny cracks in tiles, mortar or lap joints, freezes and expands, then thaws and contracts. Over many winters this cycle opens the cracks wider. Properties on open, exposed ground see sharp overnight frosts that accelerate this process on older coverings.

Wind is the other consistent pressure. Lifted tiles, displaced ridge caps and torn felt at the edges of flat roofs are all wind-related failures. A roof that has been in place for decades will have had its fixing nails corrode and its adhesive bonds weaken, which makes individual components far more vulnerable to gust loading than they were when new.

Poor original installation is a less comfortable conversation but a real one. Roofs put on without adequate underlay, with incorrect tile overlaps, or with flashings that were never properly sealed will fail earlier than the materials themselves would suggest. When we strip a roof as part of a replacement, we can see exactly what was done originally and correct any underlying faults before the new covering goes on.

Pitched roof replacement: what the work involves

A pitched roof replacement in Eriswell or the surrounding area typically means stripping the existing tiles or slates, inspecting and replacing any rotten or damaged timbers, fitting a breathable membrane underlay, and re-tiling or re-slating with a matching or agreed material. Ridge tiles are re-bedded or dry-fixed, and flashings at chimneys, walls and valleys are replaced at the same time.

For a standard semi-detached house, a pitched roof replacement using concrete interlocking tiles typically costs in the range of £5,000 to £10,000 depending on size, pitch and access. Natural slate or clay plain tiles cost more because the materials are more expensive and the labour is slower. These are indicative figures; you should get a written quote that breaks down materials and labour separately.

Flat roof replacement: felt and EPDM options

Flat roofs on extensions, garages and outbuildings are common. The two most widely used systems for domestic flat roof replacement are torch-on felt and EPDM rubber sheet.

Torch-on felt uses layers of modified bitumen felt bonded with heat. A proper installation uses a minimum of two layers with the joints staggered so no two seams align. It is a proven system when applied correctly. A typical domestic flat roof in the 20 to 40 square metre range costs roughly £80 to £120 per square metre installed.

EPDM rubber is a single-ply membrane bonded to the decking. It is flexible, handles temperature changes well and does not require heat application during fitting. Manufacturer material lifespans quoted for EPDM are often 20 to 30 years, though actual performance depends on quality of installation and the condition of the decking beneath.

In both cases, the condition of the timber decking is critical. Replacing the membrane over a soft or damp deck is a short-term fix. A proper replacement includes checking and replacing any compromised decking boards before the new membrane goes down.

Garage roofs, extensions and outbuildings

A new roof on a garage, porch or single-storey extension is a smaller job than a full house roof but still benefits from the same attention to detail on drainage falls, edge detailing and flashings where the new roof meets a wall. Poor drainage falls are a common cause of premature flat roof failure because standing water accelerates the breakdown of any surface membrane.

Many properties with attached garages and extensions may be on older felt roofs. If the felt on your garage is bubbling, cracking at the edges or has open seams, replacement rather than patching is usually the better investment.

What to ask before you agree to a new roof

Before signing anything, make sure the roofer explains exactly what will be stripped out and disposed of, whether they will inspect the timbers once stripped, what underlay is being used and why, how ridge and hip details will be finished, and what happens if additional rotten timbers are found once work has started. A clear answer to each of these questions tells you a great deal about how the job will be managed.

Call us for a straightforward assessment of your Eriswell property. We will tell you honestly whether a repair will serve you or whether a full replacement is the right decision.