Cambridge Roofers provides commercial roofing for offices, warehouses, retail units and light industrial buildings in and around Histon, covering flat roofs, pitched roofs, repairs and full re-roofs.
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A commercial roof problem rarely announces itself at a good time. A leak in a warehouse ceiling, a failed flat roof membrane on a retail unit, or cracked ridge tiles on an older office building all need a clear-headed assessment before any money is spent. The first question to answer is always the same: is repair the right call, or is it time to replace?
Cambridge Roofers works on business premises of all sizes in and around Histon, covering everything from isolated repairs to complete re-roofs on flat and pitched roofs, as well as guttering, fascias, soffits, leadwork, chimney flashings and rooflights. Getting the repair-versus-replace decision right at the start saves significant money over the life of the building.
Flat roofs on commercial buildings are most commonly surfaced in built-up felt or EPDM rubber membrane. Pitched roofs on retail and industrial units use profiled metal sheeting, concrete or clay tiles, or natural slate. Each system ages differently and fails in different ways, which means the repair-or-replace question has a different answer depending on the system, its age and its current condition.
Beyond the main roof covering, the details matter enormously. Leadwork at parapet walls, flashings around rooflights, guttering and downpipes, fascias and soffits: all of these form part of the waterproofing system. A new membrane with a failed flashing will leak just as badly as the old one. Any survey worth having checks all of these, not just the obvious area of failure.
This is the decision that most businesses find hardest, usually because a contractor has already committed to one answer before the inspection is finished. Here is a practical framework for thinking it through.
A repair makes sense when the failure is genuinely isolated and the rest of the roof is in sound condition. On a flat roof, that means: the membrane is largely intact, there is no widespread ponding, the deck beneath is dry and structurally sound, and the failure is at a specific point such as a failed lap, a split blister or a damaged upstand. On a pitched roof, a handful of slipped or cracked tiles, a failed ridge or hip, or a section of deteriorated leadwork can all be repaired without touching the rest of the structure.
A well-executed repair on a sound roof can add many years of useful life at a fraction of replacement cost. The key word is well-executed: a repair that does not address the root cause, or that uses inferior materials on a detail that needs a proper fix, is money wasted.
Replacement becomes the better option when the membrane or covering has reached the end of its practical life, when repairs have become repetitive, or when the underlying structure has been damaged by water ingress over time. A flat roof felt system that is over 20 years old and has had two or more repairs in the last few years is almost certainly past the point where further patching is economic. Each patch addresses only the visible failure; the rest of the membrane is in the same condition and will fail in sequence.
Ponding water is a strong indicator that replacement is needed. If water sits on a flat roof for days after rain, either the falls are inadequate or the membrane has deformed. Overlaying a new membrane on a deck with poor falls simply repeats the problem. Any replacement specification needs to address falls explicitly, not just swap one covering for another on the same deck.
Putting off the repair-versus-replace decision is itself a decision, and usually the most expensive one. Water entering a flat roof structure does not stay at the point of entry: it travels along the deck, wets insulation, causes the deck boards or screed to swell and delaminate, and eventually reaches the structural timbers or steelwork. What was a membrane problem becomes a structural problem, and the cost of repair multiplies accordingly.
On a pitched roof, a missing or broken tile that lets water into the void will, over months, rot the underlying battens and sarking felt. By the time the internal leak appears, the damage is already done and the repair involves far more than replacing the tile.
An inspection that tells you whether to repair or replace needs to be a physical inspection of the roof surface, not a look from the ground. On a flat roof, the inspector needs to walk the surface, check outlets and upstands, probe any areas of suspected softness in the deck, and check internal areas for signs of ongoing moisture. On a pitched roof, the void needs to be checked for daylight, staining and rotten timbers.
Ask any contractor you speak to what their inspection involves before they give you a recommendation. If the answer is "we'll have a look from the ladder", the resulting advice is worth very little. A proper inspection takes time, and the findings should be explained to you clearly before any price is discussed.
When replacement is the right call, the specification matters as much as the price. For flat roofs, the choice between felt and EPDM rubber affects both cost and longevity. EPDM costs more upfront but is more resilient and typically outlasts felt by a significant margin when properly installed. The correct fall, the right substrate preparation, and properly dressed upstands and flashings are not optional extras: they are the difference between a roof that performs and one that fails within a few years.
For pitched roofs, matching existing materials where the building requires it, using the correct underlay and batten, and setting ridge and hip tiles in mortar that is mixed correctly for the application all contribute to a roof that does not need revisiting. Slate and tile work on older commercial buildings often requires specific material choices to match what is already there.
These details are part of every commercial roofing job, not an optional addition. Blocked or undersized guttering causes water to overflow behind fascias and into the structure. Failed leadwork at chimney stacks or parapet walls is one of the most common causes of persistent internal damp in older buildings. Rotten fascias allow weather and wildlife into the roof void.
When assessing whether to repair or replace the main roof covering, it makes sense to inspect these elements at the same time and deal with anything that needs attention as part of the same job. Returning with scaffolding or a cherry picker a second time for a gutter that could have been dealt with during the main job doubles the access cost unnecessarily.
If you are not sure whether your commercial roof needs a repair or a full replacement, call us to arrange a proper inspection. We will tell you what we find and what we recommend, so you can make a decision with a clear picture in front of you rather than guessing.
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Call any time. Calls are answered day and night and passed straight to our roofers.
