The short answer
Roof work can usually be done while a business stays open, because the work happens above and outside the premises. It is managed through phasing the roof in sections, keeping access routes and exclusion zones separate from customers and staff, controlling noise and dust, and protecting stock and equipment below. Some tasks, such as asbestos removal or crane lifts, may need a closure or a quiet period.
Why most roof work can carry on around you
A roof sits above the working floor, and the building envelope is renewed from the outside. The people inside rarely need to move, and the machinery and shelving below can stay where they are, as long as the roof is not left exposed overnight. The key to this is working in sections. Only the bay being stripped is exposed, and it is made watertight again before the work moves on.
There are limits. A roof job brings noise, vibration, deliveries of materials and people moving about on site, and these affect some businesses more than others. A call centre or a recording studio feels noise in a way that a storage warehouse does not. A food production unit has hygiene concerns about dust and debris. A school or surgery has safeguarding and access concerns. The method is always the same, though: agree the constraints before the work starts, and design the programme around them.
For a larger scheme, it helps to make the conversation about disruption part of the survey, not an afterthought once the contract is signed.
Phasing, protection and keeping the weather out
Phasing means dividing the roof into areas that can be completed one at a time. On a metal sheet roof, this might be a run of bays between two purlin lines. On a flat roof, it might be a section bounded by a firewall or a change of level. The area being worked is stripped, repaired or replaced, and made weathertight before the crew goes home, so a sudden shower does not reach the interior.
Where the roof covering has to come off before a replacement goes down, temporary protection is vital. Sheeting, tarpaulins and safe edge protection stop wind and rain entering the open section. Inside, stock and equipment directly below the work can be covered or moved a short distance. Fire protection counts too, because hot works such as torch-on felt need a controlled method, fire watch and care with combustible materials stored below.
Some tasks need a quiet time or a closure. Removing asbestos cement sheeting, for example, can call for exclusion arrangements beneath and around the work, and asbestos on an industrial roof sets out what that involves.
Access, deliveries and exclusion zones
Safe access is a design problem on an occupied site. Scaffold, edge protection and ladders must go where they do not block fire exits, loading bays, disabled access or customer entrances. A hoist or crane lifts materials up, and the landing area where deliveries are unloaded needs to be separate from your own traffic.
Below the work, an exclusion zone is marked out so nobody walks where something could fall. It is usually barriered and signed, and it moves with the work. Staff and visitors are told in advance where the route has changed and for how long. Where an entrance is directly underneath the working area, a covered walkway, known as a fan or a protected route, can keep the door in use.
Fragile surfaces are the other hazard. Rooflights, old fibre-cement sheets and corroded metal can all give way underfoot, and roofers use crawling boards, nets and edge protection to manage them. Our page on fragile roof safety explains the risks and the controls.
Noise, dust, fumes and smell
Noise comes from stripping, cutting and fixing. Metal sheet roofs are loud under foot and under tools, and a few hours of drilling can disturb a meeting room. The remedy is to talk through the hours: noisier tasks can be pushed to the start or end of the day, or to the days when the affected area is least used.
Dust and debris are controlled by method. Sweeping, sheeting, enclosed chutes and sealed waste containers keep material off your forecourt and out of air intakes. Where air handling units sit on the roof or near it, the intakes can be protected or temporarily shut down, which is worth planning with whoever maintains the system.
Fumes and smell come from bitumen, adhesives and resins. A glued membrane or a hot-applied system has a smell that can reach air intakes and open windows. Your contractor should tell you which products will be used and where the smell is likely to go, so you can plan around it. For businesses with sensitive staff or customers, a mechanically fixed system avoids most of the fumes.
Planning the job with the people who use the building
A good plan starts with a survey that looks at how the building is used as well as how the roof is built. We want to know where the entrances, escape routes, plant rooms, server rooms and sensitive areas are, and which hours are busiest. From that comes a programme, a phasing plan and a list of constraints in writing.
Tell your insurer too. They may wish to know that roof work is going ahead, and our answer on what commercial property insurance expects of a roof explains what records help. If the roof has not been inspected recently, an inspection before work starts gives a baseline for the contract. And where a repair is being weighed against a replacement, the page on repairing or replacing a commercial roof will help.
The survey is free, and you finish it with a fixed price on paper and a programme to plan around. Our other work for businesses is under commercial roofing.
