I live in Biggin Hill, Kent which has a solid chalk/flint subsoil (in fact the soil is only about 3 inches thick before you hit the chalk). I have excavated a large area of garden removing about 15 tonnes of chalky hill which is now flat with a solid chalk floor. I am going to lay a patio on this new area. Will compacting this area with a whacker suffice or should I really lay a bed of hardcore under my new slabs.
Thanks for your advice.