The short answer
Metal roofs are noisy for three main reasons: thermal movement, which makes sheets tick and crack as they warm and cool; rain impact on thin single-skin sheets with nothing to absorb it; and loose or worn fixings that let sheets flutter. Movement noise is usually harmless, rain noise is a design matter, and rattling means something needs tightening or replacing, so listen first and then inspect.
The ticking and cracking: thermal movement
Steel and aluminium sheets expand when they warm and contract when they cool. A long sheet in the morning sun grows slightly along its length, and the fixings, laps and purlins it rests on have to allow for that. Where they allow it smoothly, you hear nothing. Where a sheet grips a purlin or a clip, the movement happens in small jumps and each jump is a tick, a pop or a crack.
The classic times are early evening, when a sun-warmed roof cools quickly, and first thing, as the sun comes onto the slope. The noise often moves around the building as the shadow does. If it happens at those times and not at others, thermal movement is the probable culprit, which is not in itself a sign of a leak or a failing roof.
Movement noise gets louder where fixings are over-tightened and pin the sheet, where a long sheet has no room at the ends, or where a sheet is held against a rough bearing surface. A roofer deals with it by checking the fixing pattern, freeing pinned fixings and putting in a separating layer where metal touches metal. The point is to let the sheet move quietly, not to stop it moving, which is impossible.
Rain drumming on single-skin sheets
A single-skin profiled sheet is a thin tray with a hollow space beneath it, and raindrops hitting it make the whole sheet vibrate like a drum. Heavy rain on a lightly insulated or uninsulated unit can be loud enough to interrupt a conversation or make a telephone call difficult. This is not a defect in the sheet; it is what thin metal does.
Insulated roofs are quieter because the insulation damps the sheet and the lining below blocks the sound. A built-up roof, with a liner sheet, mineral wool and an outer sheet, can be much quieter than a single skin. A composite panel, which has insulation sandwiched between two skins, is another way to damp the noise. We compare those two routes in our answer on composite insulated roof panels.
If your noise problem is rain on an older unit, the remedies range from adding insulation under the sheets, to fitting an acoustic layer, to replacing the roof with a built-up or panel system. The right one depends on how the unit is used and what the roof's condition is, so a survey comes before any proposal. Replacing a sound roof just for noise is a significant outlay and needs weighing against the benefit.
Rattling, banging and flutter: a fixing fault
Not all noise is harmless. A rattle in the wind, a bang from the ridge or a repeated slap from an edge usually means something is loose. Common causes are screws that have worked free or lost their sealing washers, a ridge flashing that is no longer firmly fixed, a trim at the verge that has lifted, or a sheet that has lost its grip on a purlin where the fixing hole has elongated.
These faults matter for two reasons. First, a loose sheet moves further every time the wind lifts it, so the damage tends to increase. Second, a fixing hole that has enlarged lets water in, so the next symptom may be a leak. If your roof starts making a new noise in the wind, ask someone to look at it before the next storm. Our answer on what to do when a commercial roof leaks covers the steps if water has already started to get in.
Repairs are straightforward when caught early: replace failed fixings with the right type and sealing washer, re-fix trims and flashings, and renew sealant at laps. Loose fixings across a whole slope suggest the roof is close to renewal.
How we find the source of a noise
Noise is hard to diagnose from a description, so we start by asking when it happens. Does it tick on sunny evenings, drum in rain, or bang in gusts? Does it come from one area or the whole building? Has it always been there or did it start after work on the roof or after a storm? Those answers point to thermal movement, a build-up problem or a fixing fault.
On site, we look at the sheets, the fixing pattern, the state of the washers, the laps, the ridge and the trims. Where the roof is safe to walk, we do that carefully on crawling boards; many unit roofs have fragile rooflights or tired sheets that need edge protection and a plan, which our guide to fragile roofs and safe access describes. We also check the underside from inside, looking for daylight, rust streaks at fixings and signs that the sheet has been moving.
Photographs of the roof go with the written findings, so you know whether the noise is cosmetic, needs a small repair or points to a bigger decision. For metal sheets themselves, the product and coating options are in our guide to metal roof sheets for commercial units.
Cost, options and when noise points to renewal
Fixing movement noise is usually a small job priced on survey. Re-fixing and re-sealing a section is the sort of work covered by national repair figures: MyBuilder's 2026 guide averages £150 to £1,500 for roof repairs, though a unit needing access equipment can sit above that. Adding insulation or an acoustic layer, or replacing sheets with a built-up or panel system, is a larger project and our answer on the longest-lasting commercial flat roof helps put its cost against remaining life.
The written quote covers access, materials, labour and waste, so the noise fix is dealt with as well as the roof. If the roof is sound but loud, a modest alteration may be enough. If it is both loud and leaking, the argument for renewal is stronger. When work is done around your business, the planning in our answer on repairing a roof while you trade applies.
Our 10-year workmanship guarantee, in writing, covers the labour in any re-fixing or new sheets. It is no manufacturer warranty and does not promise silence in every kind of weather; it means that if our fix fails, we put it right. See also commercial roofing.