Commercial Roofing in Eriswell - Materials and Your Honest Options

Expert Commercial Roofing
in Eriswell

Choosing the Right Material for a Commercial Roof

When a commercial roof needs significant work, the material question matters as much as finding someone to do the job. The wrong choice for the building type or budget can mean you are back in the same position within a few years. This page sets out the main options honestly, including where each one works well and where it falls short.

The information below covers flat roof systems in most detail, because that is where the widest range of choices exists. Pitched commercial roofs - on farm buildings, workshops and retail units - have a narrower set of material options, and those are covered towards the end.

Felt - the Traditional Flat Roof System

Built-up felt roofing has been used on commercial flat roofs in this country for decades. A properly installed system uses multiple layers of bitumen felt, each torched down and overlapped so the roof is monolithic rather than relying on a single layer. When done correctly it is a proven, reliable system.

Honest pros:

• Lower upfront material cost than most alternatives
• Straightforward to repair - a roofer can patch a localised failure without specialist tools
• Widely available and familiar to most commercial roofers

Honest cons:

• Standard built-up felt has a shorter service life than single-ply systems - typically 15-20 years on a well-drained roof
• Prone to blistering where moisture or air is trapped beneath during installation
• The surface can become brittle in UV-exposed conditions and develop hairline cracks that are not obvious until water has already been entering
• Ponding water accelerates breakdown significantly - drainage quality is critical

Felt makes most sense as a cost-effective option where the budget is the overriding constraint, or where the building is not expected to be in use long-term and a full replacement is not justified.

EPDM Rubber Membrane - the Single-Ply Alternative

EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane installed as a single sheet or in large sections with bonded seams. It has become the most common alternative to felt on commercial flat roofs and is now widely used across new-build and replacement projects on business premises, warehouses and agricultural buildings.

Honest pros:

• Significantly longer service life than felt - manufacturer data for quality EPDM systems typically refers to 30-50 year lifespans, though real-world performance depends on installation quality, drainage and foot traffic
• Highly resistant to UV degradation - does not become brittle in the way felt does
• Flexible at low temperatures, so less prone to cracking in winter
• Lightweight compared to multi-layer built-up felt systems
• The large sheet size reduces the number of seams, which are the most vulnerable points on any flat roof

Honest cons:

• Higher material and installation cost upfront than felt
• Requires proper surface preparation and priming - a poor substrate will cause adhesion failures over time
• Seams and penetration details need to be done with care - a well-installed EPDM roof performs well, a poorly detailed one will fail at exactly the same points as any other system
• Puncture damage from sharp objects or heavy foot traffic needs to be repaired promptly to prevent water tracking beneath the membrane

EPDM tends to represent better long-term value on a building that will be in use for many years, particularly where the existing roof is being fully stripped back and the deck inspected before the new membrane goes on.

Other Single-Ply Systems

Alongside EPDM, there are other single-ply membranes including TPO (thermoplastic polyolefin) and PVC-based systems. These are hot-air welded at the seams rather than bonded with adhesive, which produces a very strong joint when done properly. They are commonly used on larger commercial roofs and are sometimes specified on new-build projects. The trade-offs are broadly similar to EPDM - higher upfront cost, longer service life, but quality of installation drives performance more than the membrane type itself.

Pitched Roof Materials for Commercial and Agricultural Buildings

On agricultural and light industrial buildings with pitched roofs, the main options are profiled metal sheeting, fibre-cement sheeting, and - on more traditional commercial properties - natural slate or concrete tile. Each has its place.

• Profiled steel or aluminium sheeting - fast to install, durable and relatively low maintenance. Fixings and seals degrade before the sheets themselves, so periodic inspection of fixing points is important.
• Fibre-cement sheeting - common on older farm and industrial buildings. Can become fragile with age and is susceptible to algae growth that retains moisture. Replacement rather than repair is often the better option once sheets start to crack.
• Natural slate - used on older commercial and converted agricultural properties. Long-lasting if the slate itself is sound, but expensive to source and lay. Failing fixings rather than the slates are often the cause of problems on older roofs.
• Concrete and clay tile - used on retail and office premises. Cost-effective and straightforward to replace individual tiles. Ridge and hip mortar is usually the first thing to fail.

What to Ask Before Agreeing to Any Material Choice

Whatever you are quoted for, it is worth asking these questions before signing anything off:

• Will the existing deck be inspected before the new material goes on? Replacing a membrane over a wet or damaged deck is a false economy.
• What drainage improvements, if any, are included? A good new roof on a poorly drained deck will not perform as well as it should.
• Are the penetration details - outlets, upstands, pipe collars, rooflights - being done properly with the new system, or just patched around the old ones?
• What preparation is included - stripping back to deck, or overlaying? Overlaying saves time and money short-term but adds weight and can trap existing moisture.

Serving Eriswell and Nearby

Mildenhall Roofers works across Eriswell and the surrounding area including Mildenhall, West Row, Herringswell, Elveden, Icklingham and Holywell Row. If you are weighing up material options for a commercial roof replacement or significant repair, call us to arrange a survey and we will give you a straight recommendation based on what the building actually needs.