Fakenham Roofers provides commercial roofing services in Sheringham, covering flat roof systems, profiled metal sheet and single-ply membrane for businesses and agricultural buildings across the area.
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One of the most important decisions in any commercial roofing project is which system to use. The options available today are genuinely different in how they perform, how long they last, what they cost to install, and what they cost to maintain. There is no single best answer - the right choice depends on the building, the use, the budget and what is already there.
This page walks through the main systems used on commercial buildings in Sheringham and the surrounding area, with an honest account of the advantages and the drawbacks of each.
Torch-on felt has been the standard for flat and low-pitch commercial roofs for decades. A base layer is mechanically fixed to the deck, and one or two cap sheets are then heat-bonded on top. The cap sheet is usually mineral-faced or smooth, depending on whether the roof will be walked on or exposed to direct sunlight.
Advantages: Familiar system, well understood by most roofers. Relatively straightforward to repair locally if damage occurs. Materials are widely available and competitively priced. A well-installed two-layer system on a sound deck can perform reliably for 20 years or more.
Drawbacks: The quality of torch-on felt work varies considerably between installers. Laps must be fully bonded and upstands must be taken high enough - typically 150mm minimum above any flat surface. Where those details are cut short, premature failure is common. On larger roofs, thermal movement can stress the membrane over time if expansion joints are not incorporated. Torch-on felt is also not the best choice where a lightweight system is needed, as the layered build-up adds weight.
Single-ply systems have grown significantly in use on commercial buildings over the past 15-20 years. A single layer of synthetic membrane - typically EPDM rubber, TPO or PVC - is either mechanically fixed, fully adhered or ballasted across the roof deck. Seams are heat-welded or solvent-bonded depending on the material.
Advantages: Lighter than built-up felt systems. EPDM in particular is very flexible and tolerates thermal movement well, making it a good choice for larger roof areas. PVC and TPO can be heat-welded to give a very reliable seam. Single-ply systems are generally faster to install than multi-layer felt, which can reduce disruption to a business. When properly installed, they can last 25-35 years.
Drawbacks: The system depends heavily on seam quality. A poorly welded or bonded seam will fail without showing obvious visible signs until water has already entered. Repairs to single-ply require the correct patch materials for the membrane type - a felt patch on an EPDM roof will not bond correctly. Some single-ply membranes are also less resistant to puncture than felt, so foot traffic areas need protection boards.
Profiled metal sheet - steel or aluminium in standing seam or through-fixed profiles - is the standard choice for agricultural buildings, industrial units and many modern commercial warehouses. It sits on a purlin structure and is installed as a single-skin or double-skin (insulated) system.
Advantages: Very long lifespan when the fixings and flashings are maintained - 40 years or more is achievable on quality coated steel. Lightweight relative to its span capability. Fast to install on large buildings. The insulated double-skin (built-up or composite panel) system gives excellent thermal performance and is widely used on modern commercial builds.
Drawbacks: The fixings are the weak point. Through-fixed systems use a screw with a rubber washer to penetrate the sheet, and those washers degrade over 15-25 years. Once a washer fails, the fixing hole becomes a leak point. Re-fixing and re-sealing aged metal roofs is a specialist task and a common repair on agricultural buildings. Colour coatings also fade and can chalk, though this is aesthetic rather than structural. Standing seam systems avoid the fixing problem but cost more to install initially.
Over-roofing - fixing new profiled sheet over an existing older roof - is an option on some buildings where the structure will take the load. It avoids disposal costs and reduces the time the building is open to weather, but it does trap the old roof beneath, which can make future condition monitoring harder.
As a general guide for commercial buildings in Sheringham and north Norfolk:
Whatever system is proposed, it is worth asking a few specific questions before committing. What is the condition of the existing deck or structure - does that need attention before a new covering is installed? What drainage solution is included, and how are the outlets integrated with the new system? Are expansion joints incorporated on larger roofs? What maintenance does the system need, and how are repairs carried out if there is damage in future?
A straightforward answer to each of those questions is a sign of a roofer who knows what they are doing. If the answers are vague, ask again or get a second opinion.
Fakenham Roofers works on commercial roofing across Sheringham and the wider north Norfolk coast. If you are weighing up your options for a repair or replacement, call us to arrange a survey and we will give you a clear recommendation based on the building, not just what is easiest to install.
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Call any time. Calls are answered day and night and passed straight to our roofers.
