"terry" wrote in message
...

All previous outside structures have built, three sheds one cabin,
large wooden deck etc. we have dug down and used posts (stubs of
telephone poles and similar.

Now wondering if possible to build a shed on those concrete blocks
that just about sit on the surface. The blocks probably weigh 50 lbs
each, and are shaped on top to fit four by four post or cross member.

They are sometimes used here to support a deck or patio.

If the local building code permits this for uninhabited structures
the municipal building permits office will tell you. (You need to
know whether such a building requires a permit because, if you
decide to build without one, you may need also to camouflage
it somewhat . . . ) Just here, on top of an esker (sandhill) decks
on surface blocks seem equally as stable as those on concrete
pillars (sonotubes) sunk below the frost line.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)