Cambridge Roofers provides commercial roofing services in Newmarket for offices, warehouses, retail units and light industrial buildings - covering flat roofs, pitched roofs, repairs and full re-roofs.
Call any time. Calls are answered day and night and passed straight to our roofers.
A commercial roof rarely fails without warning. The problem is that those warnings are easy to dismiss - a stain on a ceiling tile, a blocked gutter that's been that way for months, a small blister on a flat roof surface. By the time a warning becomes an emergency, the repair bill is almost always larger than it needed to be.
This page focuses on the warning signs that commercial property owners and managers in Newmarket should know, and on what causes each one. Catching a problem early on an office, warehouse or retail unit saves money, protects stock and fittings, and means work can be planned around your tenants or business operations rather than rushed in under pressure.
Flat roofs are common on commercial buildings - extensions, single-storey retail units, warehouse sections and plant rooms. The most visible warning sign is pooling water. Some ponding after rain is normal, but water that sits for more than 48 hours points to a drainage problem or a surface that has settled unevenly. Left alone, standing water adds load, accelerates membrane degradation and eventually finds a way through.
Blistering is another sign to act on. Blisters form when moisture gets trapped beneath a felt or EPDM membrane and then expands in warm weather. A blister that splits opens a direct path for rainwater into the build-up beneath. On older felt roofs, you may also see cracking along the surface - this is the felt drying out and losing flexibility, and it tends to open up further in cold weather when frost causes contraction.
Blocked outlets deserve particular attention. A flat roof with a blocked drain can flood within a single heavy rain event. Outlets should be cleared regularly - debris from nearby trees builds up quickly - and downpipes should be checked for blockages at ground level too.
Pitched roofs on commercial buildings - common on older industrial and storage units - show their problems differently. Missing or slipped slates and tiles are the most obvious sign, and they matter because a single gap lets wind drive rain into the roof structure. Timber rafters and battens that get repeatedly wet begin to rot, which turns a simple tile replacement into a structural repair job.
Ridge tiles and verge mortar are other areas to check. Mortar pointing on a commercial roof takes the full force of wind and frost, and it cracks and loosens over time. Loose ridge tiles can fall and cause injury, so this is not a problem to leave. Internally, look for daylight visible from inside the roof void - if light is getting in, so is water.
Lead flashings at abutments, chimney bases and around roof penetrations such as pipe outlets are a recurring source of failure. Lead moves with temperature changes, and over time the fixings or mortar securing it can fail. A flashing that has lifted even a centimetre allows water to track down the wall or into the structure below.
Age is the most straightforward cause. Built-up felt flat roofs have a working life of roughly 15 to 20 years with maintenance, less if they were not well installed to begin with. EPDM rubber membranes typically last considerably longer, but the detailing around outlets, upstands and penetrations can still fail independently of the main field. Pitched roofs with natural slate can last much longer, but the fixings - nails and mortar - deteriorate faster than the slates themselves.
Maintenance neglect is the second major cause. Gutters that overflow drive water back under tile or slate edges. Flat roof outlets blocked with leaves force water to find another way off the roof. Leadwork that needed re-securing five years ago has, in the meantime, allowed water to track into the wall structure. On a commercial building where the roof is not easy to view from the ground, it is straightforward to overlook these things until they become serious.
Poor previous repairs also cause problems. A patch applied over a split membrane without stripping back to a sound edge will fail again, often within a season. Mortar slapped over old pointing traps moisture rather than sealing it out. If a repair does not address the underlying cause of the failure, it is only deferring the same problem at greater cost.
Not every problem needs a full replacement. A localised split in a flat roof membrane, a section of failed flashing or a handful of slipped slates can each be repaired cleanly and will give years of further service if the rest of the roof is sound. A proper inspection - not just a look from ground level - establishes whether the structure and remaining roof covering are worth repairing into.
The case for a full re-roof becomes clear when the covering is past its serviceable life, when repairs have been done repeatedly in the same areas, or when an inspection reveals widespread deterioration beneath the surface. Replacing a failing roof in a planned way, with the business able to schedule around it, costs less and causes less disruption than waiting for an emergency.
These elements are part of the roof system, not an afterthought. Gutters that overflow or pull away from rotten fascias allow water to saturate the wall below. Soffits in poor condition let birds and pests into the roof void. Leadwork at chimney stacks - where a commercial building has them - and at abutments is a common source of water ingress that gets misdiagnosed as a roof tile problem.
When we carry out any commercial roofing assessment, we look at the full system - the covering, the drainage, the flashings and the timber or steel elements that support and enclose the roof. A repair that addresses only one part of a connected problem will not hold.
If you have noticed any of the signs described on this page, or if your commercial property in Newmarket has not had a roof inspection for several years, call us to arrange a straightforward assessment.
An assessment gives you clear information on what the roof actually needs - not a pressure-sell for work that can wait, and not a patch where a proper repair is required. Call Cambridge Roofers for a roof survey on your commercial premises.
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Call any time. Calls are answered day and night and passed straight to our roofers.
