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<blockquote data-quote="blacksheep10" data-source="post: 631168" data-attributes="member: 13"><p>This is not as common as it should be. I built commercial building pads/roads etc for several years. A real pad is stripped down to acceptable material (get rid of ALL the black dirt, get to some good skinny clay) compact and dry, put 12" of lime screenings on it wet, compact, let it dry, pour concrete on it. You want subgrade that won't move. No matter how good the concrete is, it isn't worth a **** with bad subgrade. Having to fill your pad is a bigger deal because most small outifts don't have a compactor that hits hard enough to get compaction. Getting the dirt right is monumentally important to making your floor last forever. Proper drainage of any water away from your slab is the other.</p></blockquote><p></p>
[QUOTE="blacksheep10, post: 631168, member: 13"] This is not as common as it should be. I built commercial building pads/roads etc for several years. A real pad is stripped down to acceptable material (get rid of ALL the black dirt, get to some good skinny clay) compact and dry, put 12" of lime screenings on it wet, compact, let it dry, pour concrete on it. You want subgrade that won't move. No matter how good the concrete is, it isn't worth a **** with bad subgrade. Having to fill your pad is a bigger deal because most small outifts don't have a compactor that hits hard enough to get compaction. Getting the dirt right is monumentally important to making your floor last forever. Proper drainage of any water away from your slab is the other. [/QUOTE]
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