This CPD, sponsored by Cupa Pizarras, examines the strengths of this ubiquitous material and its suitability for roofing and cladding purposes, as well as going through the steps that are needed to ensure quality is maintained from source to the end result. Slate. A material familiar to many, its presence on roofs across the country mark it out as a much-loved addition to a home or municipal building. Whether mined or quarried, slate – essentially smooth, fine-grained metamorphic rock that can be split into layers – is natural, durable and waterproof. Environmentally friendly, slate is immune to chemical attack, it is resistant to acid rainfall and experiences low life cycle maintenance costs. This CPD will examine the strengths of this ubiquitous material and its suitability for roofing and cladding purposes, as well as going through the steps that are needed to ensure quality is maintained from source to the end result. Generally slate is surface quarried but occasionally it is mined, where geological conditions make such activity preferable. As soon as the purity and viability of the slate composition has been ascertained, development of the site begins. Once earthworks and ...