Commercial Roofing in Lakenheath - Materials and Your Options

Expert Commercial Roofing
in Lakenheath

Why Material Choice Matters on Commercial Roofs

The material you choose for a commercial roof affects upfront cost, lifespan, maintenance requirements and how well the roof performs in the years ahead. There is no single best option - the right choice depends on the building type, the roof geometry, what is on the roof (plant, rooflights, access hatches), and your budget. Below is an honest account of the main systems we fit, along with their practical advantages and drawbacks.

Newmarket Roofers carry out commercial roofing across Lakenheath and the surrounding area, working on everything from warehouses and agricultural buildings to retail units and office premises.

Torch-On Felt (Built-Up Bitumen)

Torch-on felt has been the standard flat roofing material on UK commercial buildings for decades. It is laid in multiple layers using a gas torch to bond each layer, building up a waterproof membrane that is well understood by most roofers.

Advantages:

• Widely available and competitively priced relative to newer systems
• Straightforward to repair - a localised blister or split can be patched without replacing the whole roof
• Familiar to most roofers, so workmanship quality is generally consistent
• Can be applied over an existing deck in some circumstances, reducing strip-out costs

Drawbacks:

• Thermal movement causes blistering over time, particularly on large unbroken roof areas
• The top surface layer can crack if it becomes brittle in cold weather
• A well-installed torch-on system on a commercial building typically lasts 15-20 years before replacement is needed, though this varies considerably depending on detailing and maintenance
• The open flame used during installation is a fire risk on occupied buildings and requires care around insulation boards and timber decks

Torch-on felt remains a practical, cost-effective option for many commercial applications, particularly where budget is tight and the roof geometry is straightforward.

EPDM Rubber Roofing

EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane that has become increasingly common on commercial flat roofs. It is available in large sheets that can cover a substantial roof area with very few joins.

Advantages:

• Highly flexible, which means it handles thermal movement well without cracking or splitting at seams
• Fewer joins than a multi-layer felt system, so fewer potential points of water ingress
• EPDM membranes are generally quoted with a life expectancy of 30-50 years under normal conditions, though this depends on installation quality and maintenance
• Lighter than some alternatives, which can matter on older structures where loading is a concern
• No open flame required during installation, which is an advantage on occupied buildings

Drawbacks:

• The material itself costs more per square metre than standard felt - EPDM commercial flat roofing typically runs from around £70-£120 per square metre installed, depending on roof size, access and specification
• Requires careful detailing at upstands, outlets and penetrations - the membrane is only as good as its edge terminations
• Repairs, if needed, require the correct adhesives and primers; a DIY patch is unlikely to hold
• The dark surface absorbs heat, which is worth considering if the building below is temperature-sensitive

EPDM is a strong choice for commercial buildings where a long, low-maintenance service life is the priority and the upfront cost is affordable.

Profiled Metal Roofing (Steel and Aluminium Sheets)

Profiled steel and aluminium sheeting is widely used on agricultural buildings, industrial units and warehouses. It is not a flat roofing product - it requires a pitched roof structure - but it is one of the most common commercial roofing materials in use.

Advantages:

• Spans large areas quickly, making it cost-effective for big agricultural or industrial buildings
• Lightweight relative to the area it covers
• Modern coated steel sheets carry manufacturer finish warranties of 15-25 years against corrosion, though the fixings often deteriorate faster than the sheets themselves
• Can be over-clad rather than fully replaced in many cases, which saves on strip-out and disposal costs

Drawbacks:

• Noise in heavy rain is significant without insulation layers - worth considering on office or retail buildings
• Fixings corrode at the laps and penetrations before the sheet itself fails, and this is where leaks typically start
• Condensation on the underside of uninsulated sheets can be as damaging as external water ingress on agricultural buildings
• Not suitable for very low pitches - a minimum pitch is required for effective drainage

Over-cladding (placing new sheets over the existing ones) is worth considering when the original sheets are weathertight but the coating has failed. It avoids the cost and disruption of a full strip-out and is common on agricultural and industrial buildings where the structure is sound.

Zinc and Lead for Specialist Applications

Zinc and lead are not whole-roof systems for most commercial buildings, but they are the materials of choice for flashings, valleys, parapet cappings, bay roofs and smaller pitched sections on retail and office premises.

Lead is the traditional choice and remains highly durable when correctly dressed and allowed room to move. A properly installed lead flashing should last 50-70 years. The common failure point is over-fixing - if lead is held too tightly it cannot expand, so it tears at the fixings.

Zinc is increasingly used as an alternative to lead, particularly on contemporary commercial buildings. It is lighter, takes complex shapes well, and weathers to a mid-grey patina. It costs more than lead per square metre but can be a good fit for buildings where appearance matters.

Roof Tiling and Slating on Commercial Buildings

Some commercial buildings - older converted premises, farm offices, some retail units - have pitched roofs finished in concrete or clay tiles, or natural slate. The same principles as residential roofing apply, but at larger scale. Batten condition, underlay specification and valley detailing all matter more on a commercial building where a failure causes business disruption rather than domestic inconvenience.

Natural slate, when sourced from a reliable supplier, can last well over 100 years. Concrete tiles are less expensive but have a shorter lifespan of 30-50 years and are heavier, which matters on older roof structures. Reconstituted slate sits between the two on both cost and longevity.

Flat Roof Re-Cover Versus Full Replacement

A re-cover involves laying a new membrane over the existing one without stripping back to the deck. It is cheaper in the short term but only appropriate if the deck is dry and sound. Trapping wet insulation under a new membrane accelerates deck deterioration and means the new system fails faster than it should. A core sample or moisture survey before any re-cover decision is money well spent.

Typical commercial flat roof replacement costs in the UK range from around £50-£120 per square metre depending on the system, the condition of the deck, access constraints and the complexity of the detailing. Larger roofs generally achieve a lower cost per square metre than small areas.

What to Ask Before You Commit

• Which system is being specified, and why is it the right one for this building?
• Will the existing insulation be inspected, tested for moisture, and replaced if saturated?
• How will the upstands, outlets and penetrations be detailed?
• What is the planned approach to drainage: new outlets, extended upstands, improved falls?
• How will the building be secured overnight if the job runs over multiple days?

We work across Lakenheath, Newmarket, Ely, and the surrounding area. Call us to arrange a survey and we will give you a clear, honest assessment of the options that suit your building.