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napergman 02-04-2012 11:05 AM

Gravel Type for Post Hole Drainage
I understand that it is a good idea to put gravel in the bottom of a post hole to promote draining. Is there a preferred gravel to use for this application? Is Pea gravel better than limestone?

Thanks in advance for your reply.

Daniel Holzman 02-04-2012 11:14 AM

The term gravel (in engineering classification) means the fraction of soil greater than approximately 1/8 inch in diameter. Pea gravel is a colloquial term referring to gravel which is typically greater than 1/2 inch in diameter. Gravel may be made of essentially any kind of rock, including common types such as limestone, granite, or sandstone. For your purposes, it makes no difference what kind of rock the gravel is made of. Your local material supplier will have a range of gravel size from 1/8 inch up to at least 3/4 inch, it may be called crushed stone, it may have a local name, as long as it contains only a small amount of fine material (less than 10 percent by weight) it will work well for drainage.

napergman 02-04-2012 11:27 AM

Fantastic explanation. Thanks. I can go to a local quarry and get small amounts (under 1000 lbs) of any limestone I want for free. Just saved me some cash.

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