slate roofing

Slate is a natural material, which is formed from deposits of clay rocks, which are in the process of geological changes of the earth under great pressure over millions of years compressed into a stone-slate rock. The slate has a distinct layered structure. Slate tile is made of natural slate by its delamination. To get a slate slab measuring 20 by 30 centimeters, the first sawing slabs of shale, which are manually delaminated into individual tiles. A large percentage of manual labor in the production of slate tiles causes its high cost in relation to other roofing materials.