Patio base.... hardcore or compacted chalk?

Postby pfitz13 » Tue Jul 27, 2010 8:14 pm

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.
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Tue Jul 27, 2010 8:05 pm


Simply Build It

Postby stoneyboy » Wed Jul 28, 2010 10:55 pm

Laying direct on the chalk base will be OK but in long frosty period the chalk will heave lifting the patio.
Rank: Project Manager
Posts: 2715
Joined: Wed Dec 10, 2008 6:44 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


  • Related Topics