Cambridge Roofers handles commercial roofing across Cambridge for offices, warehouses, retail units and light industrial buildings - flat roofs, pitched roofs, repairs and full re-roofs on business premises of all sizes.
Call any time. Calls are answered day and night and passed straight to our roofers.
Most commercial roofing problems don't start as emergencies. They start as small, easy-to-miss signs that get ignored until water is coming through a ceiling or a tenant is making a formal complaint. Catching those signs early is the difference between a repair bill and a full re-roof bill.
This page is about understanding what those signs mean, what causes them and what to do about them. If something on your Cambridge business premises looks off, it probably is.
A brown or yellow stain on a ceiling tile or plasterboard is the most obvious sign, but it rarely appears directly below the source of the leak. Water travels along roof decks, joists and insulation before it finds a way through. The actual entry point could be a metre or more away from the stain.
On flat-roofed commercial buildings - offices, retail units, single-storey light industrial units - this is especially common because water has nowhere to run quickly. It pools, it finds a weak seam in the felt or membrane, and it works its way in. If you see staining, don't assume it's minor until someone has been up and looked properly.
Flat roofs - particularly older felt systems - blister when moisture gets trapped beneath the surface layer and is then heated by the sun. The blisters themselves aren't always the immediate problem, but when they crack open, water gets in fast.
Splitting along seams or around upstands (the raised edges where the roof meets a wall or parapet) is another common failure point. These seams are under constant tension as materials expand and contract through changing temperatures, and over time they open up. A split seam on a warehouse roof in Cambridge can let in significant volumes of water before anyone notices.
Commercial guttering carries far more water than domestic guttering, and when it fails, the consequences are more serious. Blocked gutters force water back under flashings, saturate fascias and soffits, and can cause water ingress at the very edge of the roof where the structure is at its most vulnerable.
On flat-roofed buildings, blocked internal outlets or parapet-mounted gutters can cause water to back up across the entire roof surface. Standing water accelerates membrane deterioration and puts unnecessary weight on the deck. If your gutters are overflowing in rain or showing signs of rust, cracking or pulling away from the fascia, they need attention before they cause a bigger problem.
Lead flashings seal the joints between a roof and a vertical surface - a chimney, a parapet wall, a roof light or a change in roof pitch. On commercial buildings, poorly maintained flashings are one of the most common causes of water ingress. Lead can crack with age, lift in wind, or be incorrectly installed in the first place.
Around VELUX and other roof lights, the flashing detail is critical. A gap of just a few millimetres will let water track down the inside of the upstand during heavy rain. If you have roof lights on a commercial building and you're seeing damp around the frame, the flashing is the first place to investigate.
A flat roof that sags or feels soft underfoot when accessed has structural damage beneath the surface membrane. This is typically caused by prolonged water saturation of the insulation and decking. Once a flat roof deck is wet through, the insulation loses its effectiveness entirely and the structural integrity of the deck is compromised.
On pitched commercial roofs, visible dipping between rafters or ridge line distortion can signal rotten timbers or failing supports. This needs a proper inspection, not a patch repair.
Understanding the causes helps you plan, not just react. The most common causes of commercial roof failure are:
We handle the full range of work on business premises - not just emergency patches. That covers flat roof repairs and full flat re-roofs using felt or EPDM rubber systems, pitched roof repairs including slating and tiling, leadwork and flashing replacement, guttering and downpipe replacement, fascia and soffit work, and roof light installation and repair.
For larger or older buildings where the structure of the roof is also in question, we assess the deck and supporting structure before recommending a system. Putting a new membrane on a rotten deck is money wasted.
A repair is the right answer when the membrane or surface is broadly sound and only a localised area has failed. A re-roof is the right answer when the surface has deteriorated across more than roughly 25-30% of its area, or when the insulation beneath is wet and needs replacing. Repeated patching of a failing flat roof is a false economy - each repair costs money and the underlying problem remains.
If you're not sure which applies to your building, call us for a straightforward assessment of your roof. We'll tell you honestly what we find and what the sensible options are.
Whoever you ask to look at your commercial roof, make sure you get clear answers to these questions before any work starts:
A roofer who can't answer those questions clearly isn't ready to be on your roof.
When choosing a roofer for business premises in the towns and villages around Cambridge, ask whether they regularly work in your area. If your business premises is in this part of Cambridgeshire, call us and we'll arrange a visit to assess the roof properly.
If any of the warning signs above match what you're seeing on your business premises, don't leave it. Call Cambridge Roofers for a straightforward assessment of your commercial roof. We'll tell you what's causing the problem and what needs to happen to fix it properly.
No obligation · We'll call you to arrange a free visit
Call any time. Calls are answered day and night and passed straight to our roofers.
