Every dutyholder with an ageing asbestos cement roof eventually runs the same calculation: keep patching, strip and replace, or seal the whole thing and stop the rot. Around Derby, where engineering and railway industries left a deep stock of mid-century workshops, sheds and depots, that calculation is overdue on a lot of buildings. This page sets out the honest version of it.
Doing nothing is not a management plan
The Control of Asbestos Regulations 2012 require whoever controls a non-domestic building to identify asbestos materials, assess their condition and manage the risk under a written plan. An asbestos cement roof that is quietly weathering away, shedding surface fibres into the gutters a little more each year, does not sit comfortably inside that duty. At some point monitoring has to turn into action, and the regulations expect you to know when.
Encapsulation against removal: the honest arithmetic
Removal means full access, a controlled strip, disposal of the sheets as asbestos waste, a new roof system, and a building that may be out of action while all of that happens. It is the right answer for a failed roof, and the only answer for some, but it is a major capital project.
Encapsulation, by contrast, cleans, repairs and seals the existing sheets where they lie. The fibres are locked in, the weathering stops, the roof becomes watertight again, and the building keeps working underneath. It is substantially cheaper and faster, with one absolute condition: the sheets must be structurally sound. A coating extends the life of a good roof; it cannot resurrect a bad one.
Where these roofs sit around Derby
The pattern across Derby and the surrounding county is familiar: workshop and factory units from the post-war decades, storage sheds and depots on the trading estates, garage blocks behind older commercial property, and farm buildings out in the Derbyshire countryside, many of them roofed in the same corrugated asbestos cement between the 1950s and early 1980s. Sheets of that age are rarely beyond hope, but they are rarely untouched by weathering either, which is why condition has to be established case by case.
When coating would be money wasted
We will not encapsulate a roof that should be removed, and we will tell you which side of the line yours falls. Brittle or delaminating sheets, widespread cracking, sheets breaking up around fixings, a structure that has moved or rotted, persistent leaks that have soaked the building below: these are removal jobs, and a coating sold over the top of them would fail and take your money with it.
Equally, if the material turns out to be something higher risk than asbestos cement, such as asbestos insulation board, the work normally requires an HSE-licensed removal contractor. That is not a service we will improvise around.
How the survey works
Everything starts with a condition survey: sheets examined at close range, fixings and laps, rooflights, gutters, internal leak evidence and the supporting structure. You receive written findings and a recommendation you can hold us to. A few things help if you have them to hand:
- Your current asbestos register and management plan
- Any previous survey or sample results
- The building’s leak and repair history
- Access arrangements and operational constraints
- Your plans for the building over the next ten years
That last item matters more than people expect. Encapsulation is an investment in a building’s future, so the survey conversation should start with whether the building has one.
