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Tool Talk Discussion Forum

how much slope on concrete shop apron?

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Andy2

08-09-2005 19:21:56




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I am going to pour a concrete apron in front of an overhead door on a side wall. How much slope away from the building should I have. The slab will extend out 8' and there are no gutters on the building. thanks




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Robert in W. Mi.

08-12-2005 08:04:08




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
I always use 1/8" per foot and it works perfectly. It's enough so the rain moves the dirt off when it rains too.

Of course more wouldn't hurt either, but i like them some what level for building projects on.

Robert



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JL Sargent

08-11-2005 06:55:08




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
I have always done at least 1" in 12' with no problem just make sure it does drop some no matter what angle you use. I hate to see concrete that channels water towards a shop or house.



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NC Wayne

08-10-2005 19:43:54




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
My shop is at the at the bottom of a slope and the apron outside the roll up door is inline with the flow of water that goes down it when it rains. The pad is 20' wide and extends out 12'. I poured it with a drop of 2" both out and to one side (toward the right corner if your facing the door). It's been this way for nearly 5 years and I haven't had a drop of water in the shop. It's enough slope for the water to run off but not so much that something parked or whatever on it tries to roll away.

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Bill in NorthCentral PA

08-10-2005 12:50:48




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
Door aprons are great! I would go the 2" drop at a minimum (if mine, it would probably be 4"), 6" thick, with 6" of fill underneath.

In thousands of yards of concrete work, two things have become apparant; The quality of the fill shows in the concrete (read this to say SOLID) and concrete and water don't mix. Slope it and get is off.

I would also using Cure - n - seal roll on concrete sealer (applied the night you pour and sawcut into (based on your 8') 8x8 pads (keep them square in any case. Sawcut depth should be 1/4 of the slab depth (1.5"+/-)

Good luck!

Bill

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mike brown

08-10-2005 16:22:13




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 Re: how much slope on concrete shop apron? in reply to Bill in NorthCentral PA, 08-10-2005 12:50:48  
I would also add tiger hair to the mix. I got rid of some old woven wire panels in my aprons.



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Bill T (PA)

08-10-2005 04:47:40




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
I did the same thing with a 10' apron and it cracked all to heck



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msb

08-10-2005 08:50:44




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 Re: how much slope on concrete shop apron? in reply to Bill T (PA), 08-10-2005 04:47:40  
How much fill did you put under it? The old timers say to put in fill equal to the thickness of the concrete.6" of concrete-6" of pea fill.



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msb

08-09-2005 19:51:16




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
One tenth of an inch per foot will drain quite nicely and you will almost think it is flat Used to have a Cargill hog floor and the driveway to it was poured to that spec.



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bo

08-09-2005 19:38:23




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 Re: how much slope on concrete shop apron? in reply to Andy2, 08-09-2005 19:21:56  
1/4" to the foot. 8' would be 2". I'd probably cut that in half...water won't run off as fast but will run off.



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