Slate is a type of stone which is fine grained and highly resistant to rain, snow and sun.
What is Slate Used for?
Due to its nature and its resistance to varying types of weather, slate is often used for outside construction. The most common use of slate is as flagstone in the construction of garden paths and terraces and as an attractive patio cover. Generally, slate will be installed directly in the dirt. The process involves first, removing sections of grass to provide a level dirt surface followed by placing the slate down.
Sometimes sand will be used as filler to help anchor the stones in place providing a more solid surface. This will help to prevent future movement. Sand functions well for holding slate in place due to its small grain characteristics. It will fill in uneven spots and will compact over time providing a solid level surface for the stone to sit on top of. Concrete is also used when installing slate under certain circumstances.