Norwich Roofers provides commercial roofing installation, repair, and maintenance in North Walsham, working on flat roofs, single-ply membranes, metal sheet systems, and built-up felt across offices, warehouses, schools, and retail units.
When a commercial roof starts to fail, decisions need to be made quickly and calmly. The wrong response, whether that is waiting too long or attempting to fix things without the right knowledge, can turn a manageable problem into a costly one. This page covers what commercial roofing work actually involves, what the right systems are for different buildings, and, critically, what you should and should not do while you are waiting for a roofer to attend.
Each roofing system has different performance characteristics, maintenance needs, and repair methods.
The most common source of failure across all these systems is not the membrane itself but the detailing at junctions, including upstands, rooflights, pipe penetrations, and parapet walls. Any repair or replacement job that does not address the detailing at these points will fail earlier than it should.
Commercial flat roof replacement in Norfolk typically costs between £50 and £120 per square metre, depending on the system, the condition of the existing deck, access requirements, and whether drainage alterations are needed. EPDM and single-ply systems generally sit in the mid-to-upper part of that range; built-up felt on a sound existing deck at the lower end. Metal roofing on larger industrial structures is normally quoted per project because the structural requirements and spans differ substantially between buildings.
These figures assume proper preparation of the deck, correct detailing of all junctions, and competent installation. A quote significantly below these figures should prompt questions about what has been left out of the specification.
Not every commercial roofing problem needs a full replacement. A roof that is fundamentally sound but has localised damage, failed flashings, or blocked drainage can often be returned to good condition with targeted repairs at a fraction of the replacement cost. The key question is whether the membrane is still structurally sound across the majority of its area, or whether it has reached the end of its serviceable life.
A proper survey involves probing the deck for moisture, checking the integrity of the membrane across the whole surface, and inspecting all the details. A contractor who recommends full replacement without evidence of a thorough survey, or who proposes patching a roof where the membrane is clearly at the end of its life, is not serving your interests.
This section is for business owners and building managers who are dealing with an active roof problem right now. The period between discovering a leak or roof damage and having a roofer on site is when well-meaning but poorly judged actions often make the situation worse, and sometimes significantly more expensive.
Here is what you should do, and what you should not.
If water is getting in, your priority before the roofer arrives is protecting the contents of the building, not the roof itself. Move stock, equipment, and documents away from any area under an active leak. Place containers to catch dripping water. If ceiling tiles are present and are visibly sagging with water weight, they need to be punctured carefully in the lowest point with a screwdriver to allow controlled draining, before the tile collapses under its own weight. A sudden collapse of a saturated ceiling can cause far more damage than a controlled drip.
If electrical equipment, fuse boards, or data infrastructure is in the affected area, isolate the power to that section of the building if it is safe to do so and you have a clear understanding of the electrical layout. If you are not certain, leave the electrics alone and contact a qualified electrician.
Photograph the affected area inside the building before you move anything, and photograph it again after. Note when you first noticed the problem and what the weather conditions were. If the roof is safely and easily visible from a window or an external vantage point, photograph that too. This record is useful both for the roofer when they arrive and for any subsequent insurance claim. Do not rely on your memory; conditions change and details are forgotten quickly.
This is equally important. A number of instincts that feel sensible in the moment turn out to cause additional problems.
There are some temporary measures that are genuinely useful while you wait for professional attendance, particularly if bad weather is continuing.
A heavy-duty polyethylene tarpaulin secured over the affected area of a flat roof, weighted at the edges with sandbags placed on the parapet rather than the membrane surface, can reduce the rate of water ingress significantly. The tarpaulin should overlap the problem area by at least a metre in every direction. It will not stop water ingress entirely, but it will reduce it while a proper repair is arranged. Ensure any fixings used to secure the tarpaulin do not penetrate the membrane, as puncture damage is difficult to locate later.
For a profiled metal roof where a sheet has been damaged or displaced, the same principle applies: cover from above rather than attempt to relay the sheet. Metal roofing sheets under tension and fixed at multiple points are not safe to handle without the right equipment.
The more information you can give a roofer at the point of survey, the faster and more accurately they can diagnose the problem. Useful things to know in advance:
These details help a roofer prioritise where to look and avoid missing a cause that is not immediately obvious. A roofer who asks none of these questions and goes straight to the roof without any background information is likely to miss something.
When a roofer attends your North Walsham premises for a survey, whether in response to an active problem or for a routine inspection, the visit should cover more than a visual scan of the surface. A thorough commercial roof survey includes:
After the survey, you should receive a clear verbal explanation of what was found, ideally followed by a written report or at minimum a written quotation that specifies exactly what work is proposed and why. A quotation that says only
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
