Recently - back in May - we removed a buried fuel storage tank. We
dug out about 6' deep, maybe 8 feet wide, and 12 feet long. The hole
was refilled by the excavator, and though the excavator did a bit of
'tamping' with the bucket, not a lot of soil compaction was done.
Since then, the soil has sunk maybe 8 inches. This is in Western
Oregon; the soil is mostly clay.
We'd like to put a flagstone or paver patio over this area. What type
of soil prep is necessary? Do we need to re-excavate the entire pit,
and refill/recompact layer by layer with a jumping jack? Or can we
get away with a shallower re-excavation? Or is there some way to do
it with no excavation at all?
Is there some more expedient way to accomplish this? Just looking for
the lowest cost/effort way to prep this area for the patio, without
having to worry about re-doing it in a few years.
On Aug 25, 12:32 pm, firstname.lastname@example.org wrote:
You can get away with a shallow excavation IF you dry lay the
flagstone. Expect it to settle. If you dry lay it, then you just
life the flagstone and add sand as needed. No problems with cracks or
other problems because you can easily fix them.
Thanks for the reply. Can you define 'shallow'? How deep do you think I
should go? Or, does it not matter, because unless I go full depth it
will always settle?
The area I'm talking about paving is right next to another area (which I
also will pave) which is on undisturbed soil, and has a concrete slab
over it. Thus part of the flagstone will be on concrete, part will be
on the excavated soil. It's relative settling between the two areas
that I'm concerned about. Dry laying is no problem, that's what I was
figuring on anyway.
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