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Grading around a house guruocont 05-25-2007
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Posted by Bob Morrison on May 25, 2007, 12:37 pm
In a previous post Wayne Whitney wrote...
>
> > 6 inches in 10 feet is 0.5%.
>
> Umm, 6 inches in 10 feet is 5%.
>

My bad! Guess the coffee hasn't kicked in yet today.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by marson on May 25, 2007, 8:58 pm
> In a previous post guruocont wrote...
>
> > For grading around a building according to BOCA 1996 according to my
> > reading the slope needs to be 1 inch per foot for a minimum of 8 feet.
> > This sounds pretty aggressive. I was wondering whether more recent
> > codes have modified this requirement for a house with a basement. I am
> > researching this question a house in NJ.
>
> 1/8" per foot is only 1%. Pretty hard to control grades flatter than
> that. 6 inches in 10 feet is 0.5%. Darn near impossible to control
> without some serious surveying help.
>
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com

How about a level and a tape measure? 3 is right there between 2 and
4! :)


Posted by Glenn on May 25, 2007, 12:05 pm
Around here it is 6" in the first 5' or 5" in the first 6'.
Never could remember which but never had an inspector
actually stretch out a level and check it. Common sense.
although it is usually in short supply, usually rules. g[]


> Hi,
>
> For grading around a building according to BOCA 1996
> according to my
> reading the slope needs to be 1 inch per foot for a
> minimum of 8 feet.
> This sounds pretty aggressive. I was wondering whether
> more recent
> codes have modified this requirement for a house with a
> basement. I am
> researching this question a house in NJ.
>
> Regards..
> G
>


Posted by Dave on May 25, 2007, 11:59 pm
> Hi,
>
> For grading around a building according to BOCA 1996 according to my
> reading the slope needs to be 1 inch per foot for a minimum of 8 feet.
> This sounds pretty aggressive. I was wondering whether more recent
> codes have modified this requirement for a house with a basement. I am
> researching this question a house in NJ.
>
> Regards..
> G
>

You're quoting a grade that's equivalent to a 1 on 12 pitch roof. Otherwise
known due to that pitch as a flat roof.

I would be very aggressive, at least to the drip line. Then do the flat
roof thing.
Dave



Posted by marson on May 26, 2007, 9:10 am
>
>
> > Hi,
>
> > For grading around a building according to BOCA 1996 according to my
> > reading the slope needs to be 1 inch per foot for a minimum of 8 feet.
> > This sounds pretty aggressive. I was wondering whether more recent
> > codes have modified this requirement for a house with a basement. I am
> > researching this question a house in NJ.
>
> > Regards..
> > G
>
> You're quoting a grade that's equivalent to a 1 on 12 pitch roof. Otherwise
> known due to that pitch as a flat roof.
>
> I would be very aggressive, at least to the drip line. Then do the flat
> roof thing.
> Dave

The question is what does code require. Code is 6" in 10 feet. A
standard slope for drainage is often quoted as 1/4" per foot-- 6" in
10 feet exceeds that. Steeper slopes might be nice, but can create
their own difficulties on the uphill side.


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