Unless you stabilize the base you are almost assured of getting washout. One poor boy method of better stabilizing the base is to dry mix Portland cement with the sand that is being used for the base, don't skimp on the Portland. Several inches of this dry mix will draw enough moisture to set into a stable base, but you must make it thick enough to extend below the surrounding soil or it too will wash out as well. Set your blocks and tiles into the dry mix just as you would have on a sand base alone. One word or caution is to get everything mixed and set the first day or you may come back later to find an unworkable block of porous concrete. You can also use several lengths of re-bar or angle iron (old bed rails work fine as well) to help give strength to the base.
Dale in the Flat Lands:----- Politics is supposed to be the second-oldest profession. I have come to realize that it bears a very close resemblance to the first. ~Ronald Reagan
Christine Hartmann wrote:
The look is beautiful, but not all risers have remained stable. I'm getting sand washout over time
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