Dereham Roofers provides commercial roofing in Wendling for warehouses, industrial units, retail premises and office buildings, working around your business to keep disruption to a minimum.
Commercial roofs take far more punishment than domestic ones. Large surface areas, foot traffic from maintenance engineers, rooftop plant and equipment, and the sheer scale of water runoff all put pressure on materials that simply does not apply to a house. When something goes wrong, the consequences for your business can be serious - stock damaged, staff disrupted, customers put off, and a repair bill that only grows the longer the problem is left.
We carry out the full range of commercial roofing work for businesses in Wendling and the surrounding area: flat roof replacement and repair, profile metal sheet roofing and cladding, industrial roof repairs, guttering and drainage, and ongoing maintenance. Below we cover what each of these involves and, because it is the question we are asked most by commercial clients, we go into detail on the single most important decision you will face: repair or replace, and how to tell which is right for your building.
Commercial roofing is not one thing. The work varies considerably depending on the building type, the roof construction and the materials already in place. Here is what a full commercial roofing service typically includes.
Most commercial and industrial buildings have at least one flat or low-pitch section. The two most common systems we work with are built-up felt and EPDM rubber membrane.
Built-up felt is the traditional system, with multiple layers torched or bonded together over insulation and a deck. It is proven, affordable and straightforward to repair when damaged. A well-installed felt system on a commercial building typically lasts 15 to 20 years before a full replacement is needed, though localised repairs can extend its life considerably.
EPDM rubber membrane is increasingly specified on commercial buildings because of its flexibility, resistance to pooling water and long service life. A single-ply EPDM system on a commercial roof can last 30 years or more when correctly installed and maintained. It is also lighter than built-up felt, which matters on older buildings where loading is a concern.
Many warehouse and industrial roofs are clad in profile metal sheeting - the corrugated or box-profile steel panels you see on almost every agricultural and industrial building. These roofs are cost-effective to install, quick to put up and durable, but they do have specific failure points that owners need to understand.
Sheet fixings corrode over time and the rubber washers that seal them deteriorate, allowing water in at the screw holes. Sheets themselves can be damaged by falling debris or physical impact. The rooflights (the translucent panels built into the slope for natural light) become brittle and can crack or craze after years of UV exposure. Gutters and flashings on metal sheet roofs are a common source of leaks that are often mistaken for sheet failure.
We carry out repairs to existing metal sheet roofs, replacement of individual sheets, rooflights and fixings, as well as full re-roofing in new profile metal sheeting. We can also apply specialist roof coatings to extend the life of an ageing metal sheet roof where the structure beneath is sound.
Not every problem needs a full replacement. Targeted commercial roof repairs - sealing a flashing, replacing damaged sheets, re-coring a leaking skylight fixing, clearing and relining a blocked gutter outlet - can resolve a leak quickly and at a fraction of the cost of new work.
A proper commercial roof repair starts with finding the actual source of the leak, not just the point where water is entering the building. On large flat roofs especially, water can travel a considerable distance under the membrane before it finds a way in. Getting this wrong means the repair fails and you pay again. We locate the source before any material goes down.
Industrial and commercial gutters are sized differently to domestic gutters because the roof areas draining into them are far larger. Blocked, cracked or undersized guttering on a commercial building causes water to back up under roof edges, saturate insulation and rot structural timber or corrode steel purlins. Box gutters built into the roof structure are particularly prone to this.
We clear and repair commercial guttering, replace sections, re-seal joints and can reline box gutters where replacement is not practical. We also assess whether existing guttering has adequate capacity for the roof area it serves, which is not always checked when buildings are extended or reroofed.
This is the section that most commercial property owners and facilities managers need to read carefully, because getting this decision wrong is expensive in either direction. Replace when repair would have done the job, and you spend money you did not need to spend. Repair when the roof needed replacing, and you spend money on a short-term fix that fails again within months.
There is no universal rule, but there are clear indicators on both sides. Here is how to think through the decision for your building.
Repair is the right choice when the failure is genuinely localised. A single cracked sheet, a failed flashing around a vent, a perished lap joint in a felt roof - these are discrete problems that do not indicate widespread material failure. A competent roofer can patch, seal or replace the affected area and the rest of the roof can continue to do its job.
Repair also makes sense when the roof is relatively young and the underlying structure - the decking, insulation and supporting steelwork or timber - is in good condition. A 10-year-old felt roof with a single blister or split can reasonably be repaired. The material itself still has useful life and the repair will hold.
If the roof has been repaired before in isolated areas and held well, that is a reasonable sign that targeted repair remains viable. Some commercial flat roofs accumulate multiple small repairs over their life and continue to perform perfectly well.
Cost is a practical consideration too. Where a repair costs a fraction of a replacement and buys a realistic further period of performance, the economics usually favour repair - provided the repair is done properly and addresses the root cause of the failure rather than just the symptom.
Replacement becomes the right call when problems are no longer isolated. If you are getting leaks in multiple locations, if repairs are becoming more frequent, or if a new repair is needed within months of the last one, the roof membrane or sheeting itself has reached the end of its serviceable life and no amount of patching will change that.
The condition of the insulation and decking beneath the waterproof layer matters enormously. Saturated insulation on a flat roof provides almost no thermal performance and, if it has been wet for a long time, the deck beneath it may have started to deteriorate. At that point, stripping back and replacing is the only option that produces a lasting result. A thermal survey using infrared imaging can identify wet insulation without cutting into the roof, and it is worth commissioning on any large flat roof where the history of leaks is unclear.
Metal sheet roofs typically warrant replacement when: widespread corrosion has developed on the sheets themselves (not just the fixings); when the sheets have deformed or buckled; or when the rooflights are so degraded that replacing individual panels no longer makes economic sense. A building where the majority of rooflights need replacing at once, combined with ageing sheets, is usually at the crossover point where a full re-roof is more cost-effective than piecemeal repair.
There is also a practical business argument for replacement at certain ages. A commercial roof approaching the end of its design life will need replacing within a few years regardless. If a major repair is needed now, it is worth calculating whether the cost of that repair plus a full replacement in three years is more or less than a replacement now. For many businesses, the disruption of a single planned replacement is also preferable to repeated reactive repairs and the emergency call-outs that come with them.
Any roofer proposing either repair or replacement on a commercial building should be able to tell you, clearly and specifically, what they found, where, and why they are recommending what they are recommending. A recommendation to replace that is not backed by an explanation of the deck condition, membrane age and pattern of failure is not a recommendation you should accept without question.
Ask the roofer to walk you through what they found. Ask whether the insulation has been checked for moisture retention. Ask how many areas of failure were identified and whether they are linked or spread across the roof. Ask what the expected remaining life of the roof is if repair is chosen, and what that estimate is based on. A roofer who gives vague or evasive answers to these questions is not giving you the information you need to make a sound decision.
For any commercial flat roof where the history is unclear, a roof survey with a written condition report is worth having before committing to either course of action. It gives you an independent basis for the decision and a record of the roof's condition at the point of inspection, which is useful for insurance purposes and for managing the building going forward.
The repair-versus-replace decision often comes down to a simple cost comparison, but the comparison needs to be done correctly. The cost of a repair should be weighed not just against the cost of a full replacement, but against the cost of a repair plus the disruption and cost of the replacement that will still be needed in a few years' time.
As a rough guide for commercial flat roofs, if the cost of a repair exceeds roughly 30-40% of the cost of replacement, and the roof is already in the second half of its expected life, replacement is almost always the more economical decision over a five-year horizon. This is not a rule - every roof is different - but it is a useful starting point for the conversation with your roofer.
Profile metal sheet roofing replacement in the UK currently costs in the region of £40 to £80 per square metre depending on specification and access. EPDM flat roof replacement typically runs from £70 to £120 per square metre installed. Built-up felt replacement tends to fall between £50 and £90 per square metre. These are indicative ranges; the actual cost for your building depends on its size, the access required and what is found beneath when the old material comes off.
The most cost-effective approach to commercial roofing is neither perpetual repair nor periodic replacement - it is a planned maintenance programme that identifies problems early, before they become expensive. An annual or biannual inspection of a commercial roof, with minor repairs carried out as part of that visit, typically extends the life of the roof significantly and eliminates the emergency call-outs that cost more and cause more disruption than planned work.
A maintenance visit to a commercial property covers: clearing gutters and outlets; checking and sealing flashings; identifying blisters, cracks or lifted laps in membrane; checking sheet fixings and rooflights on metal roofs; and reporting any signs of structural movement or deterioration. The cost of this kind of visit is modest relative to the cost of even a single significant reactive repair.
If your building does not have a record of when the current roof was installed or what condition it is in, starting with an inspection and condition report is the sensible first step before making any decisions about maintenance, repair or replacement.
Commercial roofing work on an occupied building requires more planning than residential work. We schedule work to avoid peak operational periods where possible. On buildings where noise or dust is a concern - food production, customer-facing retail, open-plan offices - this needs to be discussed in advance so the work programme reflects it.
Access is a practical issue on most commercial sites. Scaffold, mobile elevated work platforms and roof access hatches all need to be factored into the programme and cost at the outset. On larger sites, material deliveries and waste removal need to be coordinated to avoid disrupting your operation. These are not afterthoughts; they need to be part of the planning from the first conversation.
If you are trying to decide whether to repair or replace the roof on your commercial premises in Wendling or the surrounding area, the best starting point is a thorough inspection by a roofer who will give you a straight answer rather than the option that suits them. Call us to arrange a roof assessment and we will tell you honestly what the roof needs and why.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
