Flat roofing repairs, replacements and new installations in Diss and the surrounding Norfolk villages. We work with felt and EPDM rubber systems on extensions, garages, outbuildings and commercial properties. If you have a leak or a tired surface that needs attention, a flat roof survey is a sensible first step.
Call any time. Calls are answered day and night and passed straight to our roofers.
Flat roofs are found on extensions, garages, outbuildings, porches and commercial premises across Diss and the surrounding villages. They are a practical choice where a pitched roof is not feasible, but they do need the right materials and decent workmanship to perform well. A poorly laid flat roof will pond water, blister and crack within a few years, which is why the choice of system and installer matters.
We carry out flat roof repairs, full replacements and new installations for homeowners, landlords and small businesses in Diss and nearby places including North Lopham. Whether you have a leak above a kitchen extension or a garage roof that has reached the end of its life, we can assess what you have and give you a straight answer about whether a repair will do the job or whether a full replacement makes more sense.
Not all flat roofs are the same. The system chosen affects cost, longevity and how the roof performs in wet or frosty conditions. We work with two main systems.
Torch-on mineral felt uses layers of bitumen-based felt bonded together with heat. A well-installed three-layer felt system on a correctly prepared deck will last 15 to 20 years before it needs attention. Single-layer felt, which is sometimes used to keep costs down, is a false economy and tends to fail much sooner.
The most common problem with ageing felt roofs is delamination, where the layers separate and allow water to track sideways before it finds a way through. Blistering is another sign of a felt roof approaching the end of its life, caused by moisture trapped beneath the surface expanding in warm weather. If you can see blistering across most of the surface, a patch repair is unlikely to hold for long.
EPDM (ethylene propylene diene monomer) rubber is a single-ply membrane that has become a popular alternative to felt. It is supplied in large sheets, which means very few joins on a standard domestic extension or garage roof. Fewer joins means fewer points where water can penetrate. EPDM is flexible at low temperatures, so it handles frost and freeze-thaw cycles well, which matters in cold weather.
A properly bonded EPDM roof should remain watertight for 30 years or more under normal conditions. The material itself does not degrade in the same way felt does, and it does not blister. It is also lighter than a multi-layer felt system, which reduces the load on the roof deck. EPDM costs more upfront than felt, but over the lifetime of the roof it usually works out better value.
A flat roof replacement is not simply a case of laying new material over old. The existing covering needs to come off so the deck below can be inspected. The deck is typically plywood or OSB boarding, and it is very common to find sections that have softened or rotted where water has been sitting, particularly around edges and outlets. Any damaged boarding must be replaced before the new membrane goes down, otherwise the new roof will fail early for the same reason.
Falls are critical on a flat roof. A roof with insufficient fall will hold standing water, which puts pressure on any membrane and dramatically shortens its life. British standards require a minimum finished fall of 1:80. If the existing roof structure does not provide adequate fall, tapered insulation can be used to create the right slope without altering the timber structure below.
On an EPDM installation, the membrane is bonded to the deck using a contact adhesive. Flashings at the edges, upstands against walls and around any penetrations such as pipes or rooflights are detailed carefully because these are the areas most likely to admit water if they are not done properly. We use compatible EPDM trim and moulded corners rather than improvising with other materials.
For felt work, each layer is torched down in sequence, with the final mineral-faced cap sheet providing the weathering surface. Lead or aluminium trim is used at the edges and upstands depending on what is appropriate for the building.
Flat roofs can deteriorate gradually and the first sign is often a damp patch on the ceiling below. By the time water appears inside, it may have been tracking through the roof covering for some time, so the source of the leak is not always directly above where the damage shows. Other signs to look out for include:
If you notice any of these, it is worth getting the roof looked at before a minor problem becomes a major repair. A small split or a lifted flashing can usually be repaired at modest cost; leaving it until water has saturated the deck will mean a full replacement is unavoidable.
This is the question most customers want answered before committing to any work. As a rough guide: if a felt roof is under ten years old and the damage is localised, a repair is worth doing. If the surface shows widespread cracking, multiple blisters or the felt is more than 15-20 years old, patching it is likely to be a temporary fix that costs money without solving the underlying problem.
EPDM roofs are more repairable across their lifespan because compatible patch adhesive bonds reliably to the existing membrane. Even so, if the deck beneath has deteriorated, replacement is the right answer regardless of the membrane type.
We will tell you honestly which option makes more sense. If a repair will hold for several years, we will say so. If the roof is at the point where spending money on a repair is not worthwhile, we will explain why and give you a price for replacement instead.
Older flat roofs are often uninsulated or under-insulated. A replacement is the best opportunity to bring insulation up to a standard that makes a noticeable difference to the room below. Cold flat roofs, where insulation sits between the joists below the deck, are prone to condensation problems. A warm roof design, where rigid insulation boards sit on top of the deck beneath the waterproof membrane, is the preferred approach for new work and full replacements because it keeps the structural timber above the dew point and avoids condensation forming inside the build-up.
Flat roofing costs vary depending on the system, the size of the roof, the condition of the existing deck and the complexity of any upstands, outlets or rooflights. As a general guide for the Diss area, felt flat roof replacement typically costs in the region of £70 to £100 per square metre, including removing the old covering and replacing any damaged deck boards. EPDM rubber roofing typically costs £90 to £130 per square metre installed. A standard single-garage flat roof replacement (around 15 to 20 square metres) would therefore fall broadly in the range of £1,050 to £2,600 depending on the system chosen and the state of the deck. Larger extensions with additional complexity such as rooflights or parapet walls will cost more. These are indicative figures to help you budget; we will give you a specific price once we have seen the roof.
As well as Diss itself, we cover the surrounding Norfolk villages including North Lopham and other communities in the area.
If you are unsure about the state of your flat roof, the sensible first step is a survey. We can inspect the covering, check the deck, assess the falls and look at the condition of all flashings and edge details. From that we can give you a clear picture of what the roof needs and a written price for the work. Call us to arrange a flat roof survey in Diss or the surrounding area.
A flat roof in Diss installed with a quality EPDM membrane on a properly prepared deck and correct falls should remain watertight for 25 to 30 years under normal conditions.
No obligation · We'll call you to arrange a free visit
Call any time. Calls are answered day and night and passed straight to our roofers.
A new roof fitted properly will protect your home for decades. We install pitched and flat roofs across Diss and the sur
Active leaks, storm damage, slipped tiles, lifted ridge tiles and failed flashings need attention before water gets furt
A full roof replacement gives your home a structurally sound, weathertight covering built to last. We handle everything
Slipped tiles, cracked flashing, leaking valleys - why roof repairs are best done properly the first time. Finding the r
