I'm laying a small patio area at the back of the garden ~3.5m by 2.5m.
I've read numerous projects, guides but would like to try and get some clarification on the whole hardcore, sub-base issue.
I'm currently preposing the following layers:
1) Weed Fabric
2) Broken pieces of old patio slabs various sizes but not crushed, filled in with a sand ballast and then levelled by treading on wood board. Overall depth of both making ~6/7cm
3) Then a fairly dry layer of sharp sand / cement mix at a 6 - 1 ratio
4) New Patio Blocks 38mm
5) Pointed with patio grout or similar.
I'd love a confirmation that I have a reasonable plan. My main concern is if using broken slabs as hardcore will suffice. If not where do I buy hardcore? In what form's can it be purchased? Do I need to go to extreme lengths of breaking up olds slabs and then firming down with machinary?
Thanks for any guidance,