What comes under patio slabs?
Patio tiles must be installed on a suitable sub-floor to ensure long-term stability and safety. The choice of substrate will depend on the type of decking being used. For tiled decks, a concrete slab is generally required, over which a sloping screed is laid to facilitate proper drainage; the tiles are then glued and grouted.
However, there are variations that do not require a concrete base. For example, rubber granules, wood tiles or thick slabs of concrete or natural stone can be laid on a base of plastic grass grid. This method requires minimal earthwork and offers the advantage of permanent water permeability. When planning your patio, choose the most suitable surface first and then create the appropriate sub-base, avoiding concrete wherever possible.