Paving and Patios How to Maintain a Patio, Paved Surface or Tarmac Driveway and Ensure it Stays in Top Condition. In this DIY guide we show you all you need to know about how to clean and maintain a patio or paved area..Take your patio from grungy to sparkling with tips for cleaning furniture from the DIYNetwork.com..Uses and Types Terminology Another example of regional terminology. In NW England, they are referred to as ‘Flags’, in other parts they are known as ‘Slabs’..So getting right to it then, what type of foundation are we going to build for our flagstone patio sand, cement, or gravel?. Short answer well it depends. Quarry screenings if available in your area are generally best for under the flagstones..