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Old 06-29-2020, 10:56 AM   #1
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Pouring concrete forms


I’m hoping to get some help in regards to making concrete forms.

I am planning to do a pour all at once as I need to rent a pump each time I get a delivery of concrete so do not want to spend a fortune.

I have a couple of questions

If I am using snap ties how many do I need per m2 of wall?

What size osb would be needed?

I plan to pour a slab and wall at the same time. Will the concrete stay in the wall form or continue to flow into the slab like water would?

Thanks
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Old 06-29-2020, 10:28 PM   #2
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Re: Pouring concrete forms


With the type of questions you're asking you obviously don't have much experience. Your best bet would be to get someone local with experience to help you or else you're going to have a big pile of cement instead of a floor and wall.
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Old 06-30-2020, 01:42 AM   #3
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Can’t really find anyone local who has much experience with concrete formed walls tbh. No houses round here are built like that. Only the rare ICF house.

It can’t be that hard to ensure the timbers are secure with bracing.


I plan to over secure With extra thickness of timbers and more bracing to be sure but can’t find information on the normal bracing for me to ensure I over engineer the bracing
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Old 06-30-2020, 03:26 AM   #4
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Re: Pouring concrete forms


Wall height above slab?
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Old 06-30-2020, 05:59 AM   #5
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1.8m high
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Old 06-30-2020, 06:00 AM   #6
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It’s a pond though. So 1.2m is underground against the ground keeping it steady and 0.8m above ground
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Old 06-30-2020, 06:01 AM   #7
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1.2m underground including the slab
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Old 06-30-2020, 06:02 AM   #8
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Sorry it won’t let me edit posts.

I plan to use snap ties and several pieces of 10mm rebar too
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Old 06-30-2020, 06:06 AM   #9
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Re: Pouring concrete forms


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Originally Posted by Sean1975 View Post

It can€™t be that hard to ensure the timbers are secure with bracing.

Maybe it can be that difficult being no one is attempting it. And even if you could form it successfully it will probably crack at the 90 joint.







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Last edited by SeniorSitizen; 06-30-2020 at 06:08 AM.
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Old 06-30-2020, 06:08 AM   #10
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Why would it crack at the 90 degree joint?
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Old 06-30-2020, 06:43 AM   #11
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Re: Pouring concrete forms


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Why would it crack at the 90 degree joint?
I understand you want to save pump truck charges for the second pour but you are going to do a lot of work to make it happen.

We would do that in 3 pours, footing, foundation or wall and then the slab is left for the pros to do. .
If you stop filling the wall just above the top of the slab you will have some bulging out at the slab you may have to wait some time to fill the rest of the wall maybe 30 minutes or more, that will give you a cold joint and you would do he slab last with another cold joint around the edges.

We get the pump for 3 hours, and when we go over it is another 3 hours, You might go over your allotted time.

Or rebar would be 15mm with 500mm grid 2" from the outside of the wall with 2 pieces at the top and 2 pieces in the footing.
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Old 06-30-2020, 06:57 AM   #12
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Is there a reason you don’t do it all in one pour though?
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Old 06-30-2020, 07:03 AM   #13
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Re: Pouring concrete forms


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Is there a reason you don’t do it all in one pour though?
We work with engineers and geo tech engineers, they like the fill to be compacted under the slab, not sure hao you would do that.

I should have asked why you are going 1,2m below the slab?
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Old 06-30-2020, 07:07 AM   #14
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No I’m not going 1.2m below slab.

My slab will be 1.2 below ground.

The slab will be 20cm thick with rebar mesh

Ontop of the 20Cm thick slab I will have a rectangular wall 20cm thick 1.8m high. With rebar in the wall. Either mesh rebar Or multiple single pcs of rebar if I use snap ties.

1m of the wall will be underground and 0.8m above ground

For a raised pond
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Old 06-30-2020, 07:08 AM   #15
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Under my slab would be solid clay
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