Concrete raft for conservatory

[DDAS]

Hello peeps

I just ordered a DIY lean-to/ conservatory from Wicks and was planning to put it on a concrete raft. It has full length wall panels so will not require a dwarf wall. The base will be 3155mm x 2715mm and a depth of 200mm and will have 9mm mesh wire reinforcement. I am hoping I can place the raft on already in place, well bedded, paving slabs but not sure if these will be adequate. Will I definitely need a hard-core sub base, or do you think it should be ok on the slabs?
Cheers

 

[Thermo]

do you know whats under the slabs? go for hardcore, by the time youve lifted them your already halfway there

 

[DDAS]

do you know whats under the slabs? go for hardcore, by the time youve lifted them your already halfway there

about 40mm of sand on top of soil

 

[masona]

See this to give you some idea.