Building A Paver Patio, Need Advice On Slope/grading - Landscaping & Lawn Care - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Building a paver patio, need advice on slope/grading

04-25-2012, 12:34 PM   #1
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I am building a paver patio and walkways totalling about 800 sq. ft. I have finished digging the dirt out (7" below surface to accomodate 4" of class II baserock + 1" of sand + 2" of paver). However, I need your input on the slope of the patio.

I remember hearing a city inspector telling me that you always need at least 5% grading away from the house to insure proper drainage. I tried grading a small area at 5% but then I realized that it would be very awkward due to the large slope.

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 04-25-2012, 12:56 PM #2 Master General ReEngineer     Join Date: Dec 2007 Location: Greenfield Maine Posts: 9,473 Rewards Points: 1,056 Ayuh,.... I donno where ya got those numbers, but 5% of 8', Ain't 4.8"s... 1% is 1 Foot, in 100 feet...

04-25-2012, 01:13 PM   #3
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Quote:
 Originally Posted by Bondo Ayuh,.... I donno where ya got those numbers, but 5% of 8', Ain't 4.8"s... 1% is 1 Foot, in 100 feet...
Here is how I got the 4.8":
8'*0.05=96"*0.05=4.8"

Anything wrong with the calculation?

 04-25-2012, 01:47 PM #4 Newbie   Join Date: Feb 2011 Location: Trafford, PA. Posts: 24 Rewards Points: 10 Ok so now keep in mind when talking grading slope it always refers back to in 100'. Then 5% slope is 5" in 100'. So your 8' is .08 of 100'. 5 inches * your .08' is only 3/8" (laughing, hope i remeberd that right)
 04-25-2012, 03:04 PM #5 It's always something   Join Date: Feb 2012 Location: Northwest Georgia, USA Posts: 186 Rewards Points: 150 Bondo, what does 'ayuh' mean?
04-25-2012, 05:26 PM   #6
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Quote:
 Originally Posted by mstew Ok so now keep in mind when talking grading slope it always refers back to in 100'. Then 5% slope is 5" in 100'. So your 8' is .08 of 100'. 5 inches * your .08' is only 3/8" (laughing, hope i remeberd that right)
Shouldn't that be " ....5% slope is 5' in 100'.... "?
then 5'x0.08=0.4' = 0.4 * 12" = 4.8". Same as my calculation right?

 04-25-2012, 07:06 PM #7 Concrete & Masonry   Join Date: Nov 2008 Location: Wisconsin Posts: 3,780 Rewards Points: 506 Just for simplicity, 2% is pretty much the same thing as 1/4" per foot, or 2" per 8', or 10" per 40', etc...... Although 5% is a great goal, if achieveable, for ground/soil around a house, pavers/concrete/asphalt/flatwork/etc... are far superior at shedding water than soil thus can do the job with less pitch. 2% is the minimum in concrete flatwork, and is barely noticeable to the untrained eye. I'm sure it will work adequately with your pavers.
 04-26-2012, 05:28 AM #8 Newbie   Join Date: Feb 2011 Location: Trafford, PA. Posts: 24 Rewards Points: 10 You are correct ht, my error not sure where my mind was at the time.
04-27-2012, 06:51 AM   #9
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Quote:
 Originally Posted by SingleGuy Bondo, what does 'ayuh' mean?
Ayuh,..... google is yer Friend, bud...

04-27-2012, 11:29 AM   #10
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Quote:
 Originally Posted by Bondo Ayuh,..... google is yer Friend, bud...
I did. But it's nicer to hear your definition.

 04-27-2012, 11:33 AM #11 Member   Join Date: Oct 2011 Location: SF Bay Area, CA Posts: 150 Rewards Points: 75 Ayuh, thanks for all the replies! So for my patio I am going to use 1% grading then.
 04-29-2012, 05:42 PM #12 Member   Join Date: Apr 2012 Location: Los Angeles Posts: 54 Rewards Points: 33 In Los Angeles you can do .5% on concrete if the city will allow. 1% is the standard though. 2% minimum is for pervious areas like grass or planters.

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