I am going to be alying down about 200 of these stones in the next
couple of weeks. My question is how important is it to have about 5
inches of packed gravel for a base beneath the sand. If a person was
to tamp the soil ( using a plate tamper) would this be ok or should a
person still use the gravel base?
The depth of gravel/sand needed is very dependent on the soil its laid
on IMO. I installed a patio at my old house in Michigan in a suburb
that was basically on top of an old sand mining area. I used very
little gravel and sand and the bricks didn't budge over 2 winters that
I had the house after that.
I would If it were mine...it's one of those things it's easier to do
now rather than later if you know what I mean. In addition, make sure
you use a quality edging to support the outside row. I didn't and
really regretted it later.
Use the gravel, ideally a gravel sand "base rock" mix. Sand compacts
very well but does not hold the compaction at all. Just your reg soil
is questionable but if you are sure you will not have to remove all
the paver's and do it again don't use the gravel...get the drift???
Its just not worth it to risk it. The best thing to use for the "base"
you are calling gravel is in fact a "base rock" mixture. Ask you local
redi mix plant if they have it or your local rockery then after
compacting this in 2-3" lifts with a little water add the sand on top
of this. This should give you many years of use no matter what your
climate is.Good Luck
there are definitely stds for this, and some may include both rock and
screeding materials, if not more than 2 layers, possibly of diff thickness'
and grid mesh sizes. Depends where it is, and what its doing. The only
thing I have heard sand for is in the days after the stones are laid, when
you tamp the stones if necc and for brooming in between the cracks, even
annually. Limestone screeding is the fine stuff that packs and when wetted,
becomes hard, but won't completely fill between the gaps. It takes time but
sand will make a grout -like bridge between all stones. Possibly sand and
definitely dirt will allow grass, moss, weeds to grow through over time. If
it was a driveway, and more Z-brick stone-sized brick, and I think if you
used sand, you would see tire track grooves over time. Pathways can slant.
Done right it would be a permanent feature of your landscaping, and can be a
totally flat platform, if poss.
Thanks for all the help. I am going to use the gravel. The soil
conditions that I have is a clay with lots a bigger rocks in it.
Nothing really grows in it because of the gumbo it makes when its wet.
I am also going to be laying out 3" drainage pipe covered in Landscape
fabric putting course around it as well and then puting the base
gravel over that, if the expects here think that is a good plan.
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