Dear all
(I am new to your site and would like to start by saying that its great to find such a hands-on resource.)
As regards my topic, I was advised a number of years ago that slabs were best laid on a semi-dry, soft sand-sharp sand-cement mix, combining buttered edges with 5-spots direct over a Type 1 base. However, your advice does not seem to touch on this metod at all, might I ask why ?
The 5 spot method does not conform to the relevant British Standards, as it leaves voids under the slab, leaking weak areas where the slab is likely to break.