On 4/22/2010 12:12 PM, terry wrote:
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.

Considering a simple wood frame shed approx. 12 by 20 sitting on nine
of those blocks, about six inches to one foot off the ground, with
possibly an insulation pad below each block to slow freezing and
heaving of the ground.

Advice/comment welcomed.

Dig the concrete blocks down below the grass roots (assuming your on
grass) to the soil level. If you find clay without going too deep so
much the better. Cheat and dig down the depth of two blocks to hit
clay. Who will ever know. Try not to disturb the base soil if
possible. Put some sand/gravel in the hole to level the block then
pack it down. Provided the entire building is on soil of the same
consistancy it will rise and settle evenly throughout the year. You
probably won't even notice it moving. Be sure to drain the area around
the shed properly. An area with excess moisture will heave in the
frost more than drier areas. That's when you may have a problem.

I built a shed that size ten years ago. Temperatures here range from
-40 to +100. Winds strong enough to knock over trees right beside it.
Never had any trouble with it, the doors and windows always worked.

LdB