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Building Sand Screening Machine

User rating 45 sand under slab instead of gravel green building forums.Mar 04, 2013sand has a much higher capillary draw than gravel, and can seep into fill perforated drain pipes, etc.Directing roof drains well away from the house is the first line of defense, but i personally wouldnt feel right about not having perimeter drain at the footing as well, even with sand that seems to drain.

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