Most commercial roof failures give you plenty of warning before they become an expensive emergency. The trouble is that the early signs are easy to miss from ground level, so the first many building owners hear of a problem is a leak over the shop floor or a damp patch spreading across a ceiling tile. Catching the signs early almost always means a repair rather than a full replacement, and a lot less disruption to your business.
Here are the seven signs we tell our commercial clients across Leicestershire to look out for, and what each one usually means.
1. Ponding water that never drains away
Flat commercial roofs are designed to shed water, not hold it. If pools of water are still sitting on the roof more than 48 hours after rain, the drainage or the fall of the roof is not working as it should. Standing water adds weight, accelerates wear on the waterproofing and, in winter, freezes and thaws in a way that opens up splits.
2. Blistering, cracking or splitting on the surface
Bubbles, blisters and cracks in the roof membrane are a sign the waterproof layer is ageing or has trapped moisture underneath. On felt and single ply roofs in particular, splits at the seams are one of the most common entry points for water.
3. Interior leaks, damp patches or staining
The obvious one, but worth stating: any water stain, damp smell or dripping inside the building means water is already getting through. By the time it shows internally the problem has usually been developing for a while, so it is worth acting quickly.
4. Rising energy bills
A roof that is letting water in is often letting heat out. If your heating costs have crept up without an obvious cause, failing roof insulation or a compromised membrane can be part of the picture.
5. Loose flashing or failing seals around edges and penetrations
The joints around roof lights, vents, pipes and the roof edge are where most leaks start. Flashing that has lifted, cracked or pulled away leaves a direct path for water, and these details are easy to check on a routine inspection.
6. Moss, vegetation or debris build up
Moss and trapped debris hold moisture against the roof surface and block drainage. On a commercial roof they also make it harder to spot the early signs above, which is why a clear, well maintained roof is easier to protect.
7. The roof is simply reaching its age
Every roof system has a service life. Felt roofs typically last 15 to 20 years, GRP fibreglass and single ply around 20 to 30, and EPDM rubber can reach 30 to 50 when well maintained. If your roof is near the top of its range, planning ahead beats waiting for it to fail.
What to do if you have spotted any of these
One warning sign on its own is usually a repair. Several together often points to a system that is nearing the end of its life, where a planned replacement works out cheaper and far less disruptive than emergency call outs. The only way to know for certain is a proper inspection.
That is exactly what our free roof health check is for. One of our team surveys your roof, photographs any issues and gives you a clear, honest report on what needs doing and what can wait, with no obligation. It is the simplest way to get ahead of a problem before it reaches your ceiling.
Frequently asked questions
How often should a commercial roof be inspected?
At least twice a year, ideally in autumn and spring, plus after any severe storm. Regular inspections catch small issues while they are still cheap repairs.
Is it cheaper to repair or replace a commercial roof?
A single isolated fault is almost always cheaper to repair. When there are multiple failures across an ageing roof, a planned replacement usually costs less over time than repeated emergency repairs and the disruption they cause.
How long does a commercial flat roof last?
It depends on the material. Felt lasts around 15 to 20 years, GRP and single ply around 20 to 30 years, and EPDM rubber 30 to 50 years when professionally installed and maintained.
Which areas does Stace Roofing cover?
We work with commercial clients across Melton Mowbray, Leicestershire and the wider East Midlands.