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What is the proper slope for directing water away from the foundation?

What is the proper slope for directing water away from the foundation?

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Old 06-25-10, 09:22 PM
TimTheToolman86's Avatar
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Location: Central Iowa
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What is the proper slope for directing water away from the foundation?

I'd like to know the minimum recommended slope for grading the soil around a house foundation, to ensure that water will runoff down the slope and stay away from the house? Also, how far out should I go? I don't want to grade it any steeper than necessary, for reasons that are unimportant to this discussion.

I was thinking of going down 1 inch per foot. I would take it out 6-7 feet, then have a 2-3 foot wide flat spot, before sloping back up to the current surface level. I'll cover the initial downward slope with 6 mil plastic, then cover the plastic with 3 inches of landscaping river rock. Is this adequate? Are there any rules of thumb to follow for slope and distance away from the house?
 
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Old 06-26-10, 02:38 AM
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Join Date: Nov 2008
Location: mid-west
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That will work fine, and the plastic is a good idea, it is also a good idea to use gutters with downspouts that take the water away through a buried tile, make sure the first 6-8' feet are solid then couple a perforated tile to that
 
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