#11  
Old 06-28-2012, 11:19 AM
Tscarborough's Avatar
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Default Re: gravel and slab on soft soil?

How much out of level is it? For the area of the base itself, 1" +/- can be taken care of with the mortar bed.
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  #12  
Old 06-28-2012, 03:10 PM
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Default Re: gravel and slab on soft soil?

It is out about 0.375"/foot across the width of the base (a little more than 1.5" total). I think a wet slab and a portland mix with cold water spread in the early morning should be strong and durable enough.
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  #13  
Old 06-28-2012, 05:51 PM
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Default Re: gravel and slab on soft soil?

Really it isn't. First you can't featheredge portland/sand, and second anything over an inch really needs a larger aggregate. They do make polymer modified repair mortars for that application, and while a little pricey they will last, especially in a freeze-thaw wear application such as you have.
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  #14  
Old 06-28-2012, 07:05 PM
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Default Re: gravel and slab on soft soil?

That almost sounds like a drainage slope to me; a bit over 1/4 inch per foot, but close enough to be intentional. I might suggest that you don't level the slab, fix half of the slope with the block mortar bed, and make up the rest with mortar joints on the stand. Then for the "finish floor" outside the stand, set some cheap slate and float out the drop over the area of the slab.
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  #15  
Old 06-28-2012, 08:42 PM
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Default Re: gravel and slab on soft soil?

What he said.
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  #16  
Old 06-28-2012, 09:05 PM
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Default Re: gravel and slab on soft soil?

Wow, saved by the community from making a poor choice again. Thank you. I'm pleased that I scrubbed the slab tonight, but went no further.
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  #17  
Old 07-04-2012, 09:01 PM
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Default Re: gravel and slab on soft soil?

I built a level stand per provided suggestions and was able to move the previously cast hearth slab to the new base without incident. -Not the recommended order-of-operations of course, but this is the second time in 8 months I've had to move a very heavy WFO related item a few meters. The first move was for a friend.

I have a few days to work on the oven now!

Thanks again to all.

Don
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  #18  
Old 07-10-2012, 05:06 AM
Serf
 
Join Date: Jul 2012
Location: NY
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Default Re: gravel and slab on soft soil?

Well, after reading the thread first thing you want just make a surface more stable and strong, to achieve that a concrete surface should be fixed after digging a foot.
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