Drone services in Sherborne

Sherborne carries an unusually high proportion of lead, parapet and valley detailing for a town its size, spread across the abbey, the school buildings, the castles and a very consistent hamstone centre.

Lead fails slowly. A split in a valley lining or a fatigued welt does nothing visible for a season and then does a great deal at once, and the first sign is nearly always inside the building rather than outside it.

Parapets hide gutters by design, so on this stock the thing carrying the water is exactly the thing nobody can see. That is not a defect of the buildings; it is how they were built, and it is why photographs from above are worth more here than on a simple pitched roof.

Stone slate on the historic buildings adds weight and a bedded rather than nailed fixing, so a displaced slate puts load somewhere the roof was not designed to carry it.

Valleys between rear ranges are the other hidden area on this stock, filled with leaf litter from the mature trees the town is full of, and a valley that is clear in June can be holding water by November.

The school and abbey buildings are large, complex and looked after on programmes rather than reactively, which changes the kind of survey that is useful.

What a trustee, a bursar or an agent wants is a condition record of a whole roof that can be compared with the same record in three years, not a photograph of the leak that prompted the call.

That is straightforward work and it suits a flown survey well, because the same flight pattern can be repeated and the sets compared directly.

It also usually involves several people needing to see the same evidence, and a shared set of photographs does that better than a written description.

Sherborne sits in a sheltered inland valley with lower rainfall than Devon, so roofs dry between wettings and growth is slower than it is west of here.

That does not make the stock low maintenance. It shifts the failure mode from damp and growth towards slow material fatigue, frost on mortar, and the gradual weathering of soft hamstone.

Those failures are quieter and easier to miss, which is a good argument for looking on a schedule rather than waiting for a symptom.

The castles and their park bring estate and landscape work, where the useful record shows a structure in its setting or the condition of ground and access across a large area.

Modern estates on the northern edge are conventional and quick, producing the ordinary short list of ridge, verge and gutter findings.

Georgian and Victorian townhouses in between carry slate and clay plain tile with the usual tight access on the older streets.

The town is a comfortable run from Exeter on the A30 and pairs easily with Yeovil or Dorchester in the same trip.

Because so much of the centre is consistent hamstone, a repair that does not match weathers obviously and permanently, which is another reason owners here want a clear record of what was there before anybody starts.