Question answered
Can roof work go on while the business stays open?
The short answer
Yes, in most cases. The roof is worked in bays small enough to be opened and made weathertight again within the working day, so the space below stays dry and in use. Safe zones keep staff and customers away from the work, noisy or dusty tasks are timed around trading, and a survey beforehand flags anything, such as asbestos cement sheets, that changes the plan.
Most commercial roofs are worked on with the business running underneath. It takes a programme built around your opening hours, a clear boundary between the work and the public, and a roof that is never left open overnight.
Phasing the roof in bays, not all at once
An occupied building is almost never stripped in one go. The roof is divided into bays, each sized so it can be opened, repaired or re-covered and sealed again before the crew leaves. Staff and customers below carry on, because at no point is a large area of deck or lining open to the sky.
How big a bay can be depends on the roof. On a built-up flat roof, a bay is a run of membrane that is lifted, renewed and tied back into the next sound section. On profiled metal sheets, it is a set of sheets taken across the full slope from eaves to ridge, so water has no gap to run into. Temporary sheeting is kept on the roof for any section that has to stay open over a break.
Phasing is also how the job fits your trading pattern. A cafe may want the loudest work before it opens; a warehouse may need its loading doors clear at set hours. The programme should show which bay is open on which day, and who on your side is told before each change.
Keeping people and the public clear
Safety comes first in the plan, because the risk is not only to the crew. Anything dropped from a roof edge lands somewhere, and on a high street or in a shared yard that somewhere is a pavement, a car park or a doorway. The usual answer is a marked exclusion zone below the working face, with fencing or hoarding, a covered walkway where the entrance cannot move, and a banksman to hold people back while materials are lifted.
Access for staff and deliveries needs thought too. Where scaffolding will stand over the footway, the scaffolders arrange the licence with the highway authority, so build that lead time into the start date. Fire exits must stay clear and usable throughout, and your fire alarm system may need its zones isolated or the cover team informed if hot work is planned near detectors.
Ask where the skip, the material store and the lifting point will sit. A tidy compound beside the building causes less disruption than a stack of rolls across the customer car park.
Noise, dust, fumes and the working day
Roof work is rarely quiet. Stripping old coverings, cutting sheets and fixing new ones all carry noise through a thin structure, and dust and debris can fall through any gap into the space below. A protective ceiling or lining, or a layer of temporary decking under the work area, reduces what reaches the room.
Fumes matter on flat roofs. Some membranes are laid with a naked flame or a hot-air welder and others with adhesives that have a smell. Tell the contractor which areas below are sensitive, such as a food counter, a treatment room or a classroom, so the method can be chosen to suit them.
Some tasks are best done when the building is empty. A crane lift of heavy plant or a run of cutting through a loud profiled deck can be booked for an early start or a quiet day, with everything else carried out in the normal working hours. Agree start and finish times in writing, and say whether weekends or evenings are available on your side, so the contractor can plan around them.
Asbestos cement and fragile sheets above occupied space
Older industrial buildings often carry cement sheets, and HSE's advice is to presume asbestos is present in a building from before 2000. That changes how you work above people. Careful removal of asbestos cement is non-licensed work, but sheeting that gets substantially broken up turns it into notifiable non-licensed work, which nobody wants to find out halfway through a trading day.
HSE also notes that these roofs are fragile, and suggests asking whether new sheets could go over the old instead of replacing them. Leaving the old sheets in place keeps the disturbance outside the building. Our page on industrial asbestos roofs goes into the options.
Fragile rooflights are a separate hazard. They can look like part of the roof and will not take a person's weight, so edge protection, covers and a clear plan for where people walk are agreed before anyone steps on the roof.
What to settle before the first day
A good start depends on a survey that finds problems before the job begins. Our notes on the commercial roof survey cover what that involves. Bring the findings together into one written programme that you and the roofer both sign off.
It should name the bay sequence, the exclusion zones, the working hours, the weather rules and the person on each side who can stop the work. Add the services that cross the roof, such as extractors, aerials, and any rooftop plant, so nothing is cut or disturbed by surprise.
If you are also weighing a green roof or solar panels, say so early, because one scaffold and one set of access arrangements disturb the business less than two. The wider picture is on our commercial roofing page. Check that any quote states whether VAT and scaffolding are in the price.
Trading through a re-roof: two practical points
What happens if rain is forecast while a section is open?
The crew only opens as much roof as it can close again that day, and the forecast sets the bay size. If the sky turns, temporary sheeting goes over the open area and the work pauses. A bay that cannot be sealed by finishing time is not started.
Should I tell my insurer or my landlord before the work starts?
It is sensible to check both. Your policy may ask to be told about major building work, and a lease often needs the landlord's consent before anyone alters or repairs the roof. A short email before the survey avoids a dispute afterwards; ask for the reply in writing.
Tell us about your roof
Describe what is happening and we will call you back to arrange a visit.
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