Collyweston stone slate is a fissile limestone from the Jurassic times.
Collyweston Slate
Used widely since the Roman times it was mined locally until the 1960’s.
Mining costs, the availability of alternative cheaper roof coverings and an abundance of reclaimed slate alongside milder winters all contributed to the closure of the mine.
Declining availability in recent times and demand for slates for larger roofs on listed buildings led to the reopening of Collyweston Stone Slate Mine in 2016.
Once quarried by hand, the stone or ‘log’ as it’s known is dropped using new technology and processed using eco-friendly methods alongside traditional skills.
From the initial freeze-thaw process to the splitting and cliving of the stone, to the chipping and dressing of each unique slate ready for installation on a roof, it is an art in itself even before a slate is laid.
The slates are laid in diminishing courses meaning the slates get smaller with each course with the smallest at the ridge line and the largest at eaves level.
Collyweston slates are random sized and shouldered meaning the slates’ top corners are angled. Each individual slate has to be laid in relation to the two slates below to give adequate side lap. More importantly they must provide adequate lap over the shoulders to prevent leaks. There are 28 different sizes of slate.
Collyweston slate is one of the most durable and natural roof coverings there is and a new correctly fitted and maintained roof will last for centuries.
Decades of heritage and Experience under one roof
Awards & Professional Accreditations
