Drive out of Norwich in any direction and within minutes you are passing barns, grain stores and machinery sheds roofed in profiled asbestos cement. The same sheets cover older units on the industrial estates around the city’s ring road. Most went up between the 1960s and the 1980s, and a surprising number are still doing their job. The question for the people responsible for them is what to do as the surface weathers: strip the roof out, or seal it and manage it in place.
Asbestos roofs on farms and industrial units around Norwich
Norfolk’s agricultural building stock leans heavily on asbestos cement. It was cheap, light and quick to fix down, which is exactly why so many farm buildings across the county still carry it. In and around the city, post-war workshops, stores and light industrial units used the same material. When the sheets are sound, this is manageable. When decades of weather have eaten into the cement, the roof goes porous, grows moss, starts leaking at the laps and fixings, and slowly releases fibres from its eroding surface. That is the point at which doing nothing stops being an option.
Remove it, or manage it? What the law actually says
The Control of Asbestos Regulations 2012 place a duty to manage asbestos on whoever controls the maintenance of non-domestic premises, and that includes farm buildings used for business. You must identify the material, assess its condition, keep a record and manage the risk under a written plan. Nothing in the regulations forces removal of asbestos cement that is in fair condition. HSE guidance points the other way: material in good condition is usually safer left undisturbed and managed. Encapsulation gives that management plan teeth, because it physically arrests the weathering instead of just noting it down once a year.
What an encapsulation system does for a weathered roof
The process is deliberate and controlled. We clean the sheets without abrasive methods, treat the biological growth, deal with loose fixings and minor defects, and then apply a purpose-made encapsulant coating across the roof. Done properly, on a roof that is structurally sound, it delivers several things at once:
- Seals the eroded surface and locks down fibre release
- Restores weather resistance and stops the porous sheets drinking water
- Slows moss and lichen regrowth
- Extends the serviceable life of a roof that would otherwise keep degrading
- Keeps the building in use while the work happens
When we will advise against encapsulation
This part matters. Encapsulation only works on sheets with enough integrity left to carry a coating. Where a roof is riddled with cracks and holes, delaminating, crumbling at edges and fixings, or degraded to the point of friability, coating it would be poor advice and worse practice. Storm-damaged roofs, structures with suspect frames and buildings due for demolition or redevelopment fall into the same category. In those cases the right route is removal under proper controls, and our report will say exactly that. We would rather lose the job than coat a roof that needed to come off.
The survey decides, not the sales pitch
Every job starts with a condition survey: sheet condition, erosion depth, defects, fixings, roof lights, and the underside where access allows. The findings determine the recommendation, and you get them in writing either way. If encapsulation is right for your Norwich building, we specify the system, the preparation and the re-inspection interval so the work slots into your asbestos management plan. If it is not, we tell you plainly and you can put your budget where it belongs. We are a South-East based contractor and cover the city and the wider county as part of our normal working range across England.
