"mark" wrote

My proposed patio will be made with 450mm slabs. As it is at the back of
the house there will be no vehicles driving on it.

I have lots of sand and it is my intention to lay the slabs on a 100mm bed
of sand which has been dry mixed with a 1:15 cement addition.

Has anyone experience of this method? I appreciate that it is usual to put
a subbase of stone down first but that'll be around £300 extra and I've
plenty of sand.

mark
Is the area well compacted or likely to settle?
I did a similar job years ago as you describe (except 50mm sand/cement dry
mix well stamped down).
But mine was on well compacted ground with significant clay content.
Check out www.pavingexpert.com for qualified advice.

Phil