Mike Duffy posted for all of us...



I am in the midst of a fair-sized landscaping job. (Two 4-walled
interlocking brick flower boxes, sidewalk, patio, etc.)

I am planning to buy a compactor instead of renting one because I plan a
separate job next year, so I will have ample time to compact the
existing soil (clay/sand) where I have recently dug plus perform an
unhurried job on each of the components.

That is probably a good idea. Compact it just prior to each component. The
reason I say this is because-not knowing where you live and time-lines the
soil may be affected by a freeze/thaw cycle or drainage.

I can calculate the volume of compacted gravel needed, but I need to
know the expected compaction ratio to enable me to order the correct
amount of 0 - 3/4" compacting gravel.

I would ask the provider of the stone. I don't know what the ratio would be
for your area. Like Oren stated do it in 2" lifts and compact. Back fill low
areas with high areas. I believe landscapers would just use a 4" lift and
compact. Do you intend to install a concrete footer?

--
Tekkie