#11  
Old 10-20-2012, 09:49 AM
mrchipster's Avatar
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Default Re: A base on a slab that is not level- how to?

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Originally Posted by chickade View Post
I got a level and it appears that the back is 3 1/2 inches lower than the front, so I'm making a form out of 2 x 4s. I will build up concrete at the back and try to level it off by hand toward the front. I will draw lines along the side 2 x 4s that are level to the back so that I have a guide, and then I will attempt to add more concrete in the center of the form so that water runs off. How does that sound?
If you can stake and nail 2x4s all arround possibly 2X6s at the thick end of your slab and then use a long 2x4 to go across the top of the forms, with one person on each end you should be able to slide the 2x4 back and forth as you push the wet concrete across the existing slab to level out the wet concrete. check out videos on youtube screeding concrete.

chip
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  #12  
Old 10-20-2012, 12:50 PM
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Default Re: A base on a slab that is not level- how to?

Yes that's the way to do it, but then you need to add more to the centre so it mounds up slightly for the water run off. You need a concrete float to do this. Find a friend or neighbour who's had a little experience, to help you.
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  #13  
Old 10-21-2012, 02:21 PM
Peasant
 
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Default Re: A base on a slab that is not level- how to?

I wish I had someone with more experience to help me but I don't. If I rent a large bull float would that make it easier to make the right kind of mound?

Here is a picture of the form I built to level out the area. Tomorrow we are planning to mix the cement by hand. Any suggestions?

Last edited by chickade; 10-21-2012 at 02:22 PM. Reason: no picture
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  #14  
Old 10-21-2012, 02:37 PM
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Default Re: A base on a slab that is not level- how to?

Quote:
Originally Posted by chickade View Post
I wish I had someone with more experience to help me but I don't. If I rent a large bull float would that make it easier to make the right kind of mound?

Here is a picture of the form I built to level out the area. Tomorrow we are planning to mix the cement by hand. Any suggestions?
Your picture did not show up.

Here is my home made bull float. I worked quite well and minimal troweling required after using it.

It is a 2X6 with a 2X3 attached for a handle The bowed and now cracked arch is a 1X2 but you could easily use a piece of metal strapping or plywood for the bowed stabilizer.

It has served me well on 3 pours. and is almost 3 years old.

If mixing concrete by hand make sure you have enough to continue your pour without needing to go to the store for anything. I assume you are using sack concrete mix?

Have a few extra bags over your estimate, You can always take a few bags back.

What are you mixing in? Deep Contractors wheel burrow is recommended That way you can roll the mix to the desired spot for pouring and it has nice rounded surfaces making it easier to get a consistent mix. For hand mixing and use a garden hoe and small spade/shovel it makes the hand mixing easier. Do not use a rake to mix, mix no more than 2 sacks at a time as it is difficult to hand mix more than that. and you may want to start with one sack at a time.

Chip
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Last edited by mrchipster; 10-21-2012 at 02:48 PM.
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  #15  
Old 10-22-2012, 02:58 AM
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Default Re: A base on a slab that is not level- how to?

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I wish I had someone with more experience to help me but I don't.
If you are having trouble at getting a level foundation slab then the oven will probably be a real struggle for you, sorry to say.
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  #16  
Old 10-22-2012, 06:05 AM
Peasant
 
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Default Re: A base on a slab that is not level- how to?

Thanks for the suggestions. I was going to rent a bull float, and I have someone to help me, so that if it looks like we are running out we can get more.

Yeah- I am in over my head, but I am getting lots of help, thanks to you all, the folks at Home Depot, and Galantinos Masonry Supply.

Do you have a few more detailed suggestions about how to make the middle of the form slightly higher than the edges? We will pour the form and then level it off with a 2 x 4, what then?
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  #17  
Old 10-23-2012, 11:56 AM
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Default Re: A base on a slab that is not level- how to?

If I was building this oven - I would not pour any more concrete on the slab. It's going to be much too thin in spots and will likely crack and may separate from the slab below.

Instead, I would level when building the walls for the base - and leave a couple of small openings in the joints in the bottom course (rear) to drain in the even water gets in the wood storage area. In fact - if you wanted to - you could pour some leveling concrete inside the wood storage area once the base is built.

It is, of course, up to you - but I think you're more likely to have problems trying to add more concrete to the top of the slab.
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