5% slope too much for patio?

Reply

  #1  
Old 05-20-20, 05:18 AM
C
Member
Thread Starter
Join Date: Oct 2016
Location: USA
Posts: 10
Received 0 Votes on 0 Posts
5% slope too much for patio?

I am in the process of building my first patio and it seems like the standard of slope is 1/4 per foot. The slope of the ground that has already been dug out was already beyond that with a slope around 5%. My question is this slope too much or do I need to build up the lower end so there is a drop off on the low side of the patio?

As you can see the patio drains water in the right direction by the picture. Thanks

NOTE: please ignore the first two pictures as I attached them by mistake and cant figure out how to remove them. My picture is the 3rd picture with the water pooling on the base.
 
Attached Images    
Sponsored Links
  #2  
Old 05-20-20, 05:25 AM
Marq1's Avatar
Member
Join Date: Sep 2016
Location: USA MI
Posts: 5,680
Received 243 Votes on 230 Posts
1/4" per foot works out to 2%,

5% would be 5/16" per foot!

A 15' patio would drop almost 5", that seems a little too much for me!
 
  #3  
Old 05-20-20, 05:26 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 8,423
Received 169 Votes on 154 Posts
As long as it flows away from the house or any other structure try to keep it to minimum (say 3%) if possible. The problem arises when you place furniture, awnings and other things. They are not level. Seems like a trivial thing, but my experience says otherwise. Not a big problem just an annoyance.
 
  #4  
Old 05-20-20, 05:42 AM
C
Member
Thread Starter
Join Date: Oct 2016
Location: USA
Posts: 10
Received 0 Votes on 0 Posts
If I measure from the house to the middle of the curve section it's approx 21 feet. I ran a string line level and measured down to the grass from the string line low point which was approx 11 inches so that would be around 4.4% correct? You think that's too much because visually it doesn't look too bad.
 
  #5  
Old 05-20-20, 05:43 AM
P
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 22,419
Received 445 Votes on 409 Posts
I've done paver patios with as much as 1/2" per foot slope when I wanted to guarantee good movement of water. Most people never notice it but "engineering" minded people are able to tell.
 
  #6  
Old 05-20-20, 05:51 AM
C
Member
Thread Starter
Join Date: Oct 2016
Location: USA
Posts: 10
Received 0 Votes on 0 Posts
The plan is to put a seat wall at the bottom of the curve, but I'm still figuring out how to drain the water off and not have the seat wall capture the water like a bowl. I just want to make sure I don't need to build the low side up first which I'm leaning on leaving it as is.
 
  #7  
Old 05-20-20, 06:01 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 8,423
Received 169 Votes on 154 Posts
Yes I do. All you need is just enough of a slop for water to flow down hill and not pool.

These are (very poor) pictures of mine. I'm posting only to show that it is large and even the 2 -3% slope is noticeable (certainly not in the pictures). And yes it needs a good cleaning. The last pic is when it was brand new.








 
  #8  
Old 05-20-20, 06:04 AM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 8,423
Received 169 Votes on 154 Posts
Build in drain holes at the base of the bench
 
  #9  
Old 05-20-20, 09:08 AM
C
Member
Thread Starter
Join Date: Oct 2016
Location: USA
Posts: 10
Received 0 Votes on 0 Posts
The patio looks great! So basically if I want to stick to a 3% slope I really just need approx 3 inches more rock base at the lower end? Now: 11 inch rise, 21 feet run=4.36%, change that to 8 inch rise=3.17%

Also, the drainage holes, are you saying that the first layer of bricks used for the seat wall be spaced maybe an inch to allow water to pass through to the other side?
 
  #10  
Old 05-20-20, 02:22 PM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 8,423
Received 169 Votes on 154 Posts
first layer of bricks used for the seat wall be spaced maybe an inch to allow water to pass through to the other side?
basically yes. But what part of the country are you in. I'm a little concerned about freezing and heaving. I'm not sure if a gap or a drilled hole in the brick is better.
 
  #11  
Old 05-20-20, 04:36 PM
C
Member
Thread Starter
Join Date: Oct 2016
Location: USA
Posts: 10
Received 0 Votes on 0 Posts
I live in Indiana so definitely we have freezing. Could I space the bottom row possibly every other brick an inch a part?
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: