Back | Main Details | Samples & Images | Quarries | Usage | References |
General Comments: |
Modern usage includes roofing, cladding, paving, sills, copings, masonry walling, crazy paving, fireplaces and many other architectural purposes. Tests show that it is only suitable for roofing in environments of low pollution (Hart 1991: 16). |
|
---|---|---|
Known Usage: | Durham Cathdral: Roofing. |