Re: Re: Kinda OT, But how much gravel do I need?

Posted by john on March 25, 2004 at 20:51:32 from (68.222.43.158):

In Reply to: Re: Kinda OT, But how much gravel do I need? posted by EngineerJoyce on March 25, 2004 at 17:51:37:

I have often seen people recommend the use of geotextile for driveways and have refrained from commenting on the subject because I do not know the type of rocks that are being used in different parts of the country. But I see no warning about using geotextile with some types of rock so thought I would put in my 2 ¢

If you use geotextile with some types of rock you will not be happy. If you are using a rock like crushed limestone that has large and small rock to where it can pack you will be fine. But if you use a one size gravel like is available in our area it will never pack down because the gravel can not pack into the dirt. This will cause your years old drive to be a loose bed like the day it was put down. While I try to put down a good layer of rock when building a drive I do not want one I may get stuck in even years from now. Others may try to put a thinner layer of rock to reduce this but that is not good either as it may expose the geotextile and cause tears in it making it useless.

A remedy to this is to put down your geotextile then add your layer of rock then a small amount of clay dirt. The clay fills the voids allowing the rocks to pack but the geotextile keeps your drive from sinking out of site.

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