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Old 05-31-2013, 12:11 AM   #1
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grading dirt in backyard question


I am removing my old concrete patio and dirt in backyard because the combination of the the two is too high. I am bringing the dirt down to about 6" below the vents going into the crawlspace that are part of my raised foundation. Does anyone know how many inches to drop the grade going away from the house? Is it like 1 inch every 10 feet? Thanks
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Old 05-31-2013, 12:35 AM   #2
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grading dirt in backyard question


just saw a you tube video that said the grade should drop 1 inch every foot coming away from the house. Then I saw another one said 1/4" to 1/2" every 10 ft,then I saw another you tube video said 1" every 4 feet. It just keeps getting better.

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Old 05-31-2013, 02:57 AM   #3
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grading dirt in backyard question


the greater the slope the faster you move water away from your home and foundation. Most building codes require a 6" drop within 10' of the foundation.
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Old 05-31-2013, 08:54 AM   #4
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grading dirt in backyard question


I would say at least a 1/4 inch per foot. That is code for low slope roofs, and plumbing. A little more would be better if you can do if as roofs and pipes are impermeable (Hopefully)
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Old 05-31-2013, 09:42 AM   #5
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grading dirt in backyard question


2% minimum away from the house. Some cities are requiring 5% minimum for 10-15' from the house.

1" per 10' is .83% slope. 1" per 4' is roughly 2%.
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Old 05-31-2013, 09:51 AM   #6
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grading dirt in backyard question


Your in California.....a heavy rain here is just a sprinkle in Texas.

But compounding your problem is the clay dirt we have...once it's gets wet...it's like a plastic tarp...water just sits on top.

I think your going to be fine with 2% or 1/4"/ft.

If you have any areas that it looks like it will be hard to get the water away from...dig a trench and make a French drain.
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Old 06-01-2013, 10:01 AM   #7
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grading dirt in backyard question


I will probably go with the minimum % on this project. I should have mentioned some other things that play into the minimum decison. I have 3' eaves and rain gutters around my whole house which helps keep what little rain we do get in Calif (10"-if we are lucky) away from the house. I realized one day that the storm drains for our tract are at the other end of the tract meaning to me that I am at the high end of the tract if there is such a thing.I have watched rain easily move away from my house on rainy days. I am not certain if I am wrong about this as I only have watching the as my testament to this theory.
My whole reason for asking this grading question is the previous owners who bought the house is 1965 had a concrete patio put in the backyard with a walkway on the northside. The people doing the work never graded the elevation so the top of the patio is almost level with the vents for the crawlspace. It is my understanding that the grading needs to be at least 6" below that vent so I am tearing out the completely cracked all over patio and removing the necessary amount of dirt to accomplish this feat. Big job but great exercise. So I think with all the other positives I have going to remove water I should be fine with minimum % grading. See pictures that show top of concrete is under the vent. Plus I have to replace sill plate and rim joist that has rotted over time.
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