Poulton lies in southern Cotswold District, and the council's technical guidance on stone roofing is worth knowing even if your own roof is another material. It explains how traditional roofs were built, and therefore how best to mend them. The guide dates from 2000, so we treat it as a record of traditional practice, not a supply list.
Q2.1How was a stone roof built?
When the quarried rock is split, it yields a great many short stones for every long one, so the longest slates are doubled up along the eaves and the shortest sit close to the ridge. Roofers call this laying in diminishing courses. Each stone hangs from a batten, pegged through a drilled hole at the top, and the guide notes that oak was usually cleft to make the pegs. A traditional stone roof is steeply pitched, usually at 47 to 55 degrees, and the guide describes such roofs as very heavy.
Q2.2Where should replacement stone come from?
The guide's advice on sourcing is plain. New stone slates are preferred to second-hand ones, reclaimed stone belongs only on the building it came from, and limestone and sandstone should never be mixed. We follow the same thinking, because stripping a neighbour's barn to mend your house only moves the problem along the lane. A roof laid with the right stone, at the right size, also keeps the proportions of the building that people notice from the street, and it weathers into the surrounding roofs instead of standing apart from them for years.
If your house has a stone roof, our Cotswold stone roofing page goes through the work in more detail. If it has a different covering, the survey will say so and we will recommend what suits it, whether clay, slate or concrete.