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Old 04-08-2019, 06:06 PM   #1
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Advice for setting ip slab of concrete


Hello i have a concrete slab in my backyard i want to add to it and also slope it away from my foundation. I got prices and they are on the 2000-3000 for the area i want so i looked it up and i was wondering if this is something a diy can do.the area im looking to fill is
23ft x 4ft 6in x 5 inch deep so it will match the old slab.im looking to fill area under house. Also how many bags of concrete would i need. Any advice would be great.
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Old 04-08-2019, 06:10 PM   #2
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Re: Advice for setting ip slab of concrete


you planning on driving or parking something heavy on it? 5" thick is overkill. 3.5 - 4" for a sitting patio is sufficient. and, yes, its a good DIY project. watch a couple youtube videos on how to get the pitch and set the forms...

use this site to get # bags:
https://www.quikrete.com/calculator/...w_wcB#concrete
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Old 04-08-2019, 06:17 PM   #3
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Re: Advice for setting ip slab of concrete


Are we just talking about the space below the bump out wall?
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Old 04-08-2019, 06:20 PM   #4
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Re: Advice for setting ip slab of concrete


Google concrete calculator if you want to know how many bags it will take.
No way would I DIY this, there's way more to it then it looks like.
Do you own a cement mixer, bull float, plate compactor?
I've seen way to many DIY slabs done wrong.
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Old 04-08-2019, 06:25 PM   #5
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Re: Advice for setting ip slab of concrete


Quote:
Originally Posted by joecaption View Post
Google concrete calculator if you want to know how many bags it will take.
No way would I DIY this, there's way more to it then it looks like.
Do you own a cement mixer, bull float, plate compactor?
I've seen way to many DIY slabs done wrong.
plate compactor, might be a problem under a bump out.
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Old 04-08-2019, 06:33 PM   #6
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Re: Advice for setting ip slab of concrete


I would do it, but sure wouldn't be mixing by the bag. Possibly bring in sand, gravel and buy bags of portland. But more than likely I would bring in a custom mix truck. You need just under 1 1/2 yards at 4" depth.

The plus side here is that 4.5' wide is relatively easy to screed and finish.
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Old 04-08-2019, 06:34 PM   #7
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Re: Advice for setting ip slab of concrete


Sure you can DIY.


But the way the post is worded makes me wonder if this is supposed to be a fix for a water intrusion problem. If so, it will help, but would make it more expensive when you finally decide to attack the root problem.
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Old 04-08-2019, 06:39 PM   #8
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Re: Advice for setting ip slab of concrete


Do you have any helpers, preferably one or two who have done concrete before? Definitely want a mixer, it will be about 80 sixty pound bags and that would be for 4" thick. 50% more if you want 6".

Having help is important as once you start you want to finish and while one person is mixing another can be troweling out what has been poured.

And don't forget the soda and hotdogs.

Bud.

Beer would be after it is done if desired.
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Old 04-09-2019, 05:06 AM   #9
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Re: Advice for setting ip slab of concrete


Hello thanx for all your answers. I just took the measurement off the slab im adding to i can always add rock or stone or dirt. To bring up the measurement closer to 4 inch depth.
Yes it is the bump out that im trying to cover up and also add to my original slab. There is no water penetration issues that i know my bsmt is finished. I noticed the original slab os graded toward my house so i kinda thought to add this new slab and grade it away from house so water penetration don't happen in the future cause it hasn't happened yet.

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Old 04-09-2019, 06:20 AM   #10
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Re: Advice for setting ip slab of concrete


measure down at both ends of the bump out and snap a line with a chalk line, then check the level at the end of your patio.
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Old 04-09-2019, 07:36 AM   #11
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Re: Advice for setting ip slab of concrete


Quote:
Originally Posted by Nealtw View Post
measure down at both ends of the bump out and snap a line with a chalk line, then check the level at the end of your patio.
The red mark u made is the level and the black line is what my chalk line i measured is from the top of the bump out to the hight of the slab i want to make? Is that checking level or grade towards slab? I am asking cause the dirt is bumpy no level i was gonna level that area in preparing for the work but i do want a lil grade away from house

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Old 04-09-2019, 07:48 AM   #12
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Re: Advice for setting ip slab of concrete


Quote:
Originally Posted by chris3178 View Post
The red mark u made is the level and the black line is what my chalk line i measured is from the top of the bump out to the hight of the slab i want to make? Is that checking level or grade towards slab? I am asking cause the dirt is bumpy no level i was gonna level that area in preparing for the work but i do want a lil grade away from house

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You want to check from the chalk line to the concrete just to see if there is a slope there already. If there is a slope there it is easy and if not then some more thinking to do. So check that first.
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Old 04-09-2019, 08:13 AM   #13
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Re: Advice for setting ip slab of concrete


Ok gotcha i will do that when i get home and get back to you

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Old 04-09-2019, 08:25 AM   #14
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Re: Advice for setting ip slab of concrete


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Originally Posted by Bud9051 View Post
Do you have any helpers, preferably one or two who have done concrete before? Definitely want a mixer, it will be about 80 sixty pound bags and that would be for 4" thick. 50% more if you want 6".
No way would I ask friends to help haul 80 60-lb bags of concrete.
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Old 04-09-2019, 09:59 AM   #15
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Re: Advice for setting ip slab of concrete


since you'll have 2 joints, that's 3 pours of 80# b - easy enough to diy
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