New Concrete On Top of Old

St. A

I touched on this topic in another thread, but thought this title would get right to the point. I'd like level an existing concrete foundation which was graded rather steeply at 7 1/2'' over an 18' run. I'm looking at doing this in two locations- one under the house (carport), one on a concrete parking area. I'm thinking of cleaning the old concrete, drilling some holes in it, adding rebar to help reduce any shifting, and then call in a truck for the pour. It looks like it would be about three yards in each location. How does this manner of leveling sound? Thanks- Aaron

woodworkbykirk

if you have done your calculation right on the volume you should be fine.. just be sure to strike a level line with a laser level so to have something to finish to

itsreallyconc

would you touch on this a bit more 'cause i just got in someone poured a footer that's 7 1/2" LOW on 1 end 18' from the correct elevation ? ? ?

obviously having the conc contractor come back isn't an option ? then again, i he hadn't noticed the forms had fallen OR didn't use a level, why would you want him back,,, 'cleaning the old concrete' may involve scarifying or using a bushing tool, mortar for a bonding compound to prevent old conc from sucking moisture out of the new, vertical rebar 2' o/c + horizontal #4 bar tied to the vertical bar,,, anyway, that's my story & i'm stickin' to it

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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help
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Bondo

Ayuh,.... 'n you shoulda stuck with that thread,...

You've only answered a few of the questions asked of you, There....
Now yer runnin' another thread, 'n Nobody has a clue as to what yer talkin' 'bout....

If ya run 1 thread 'bout the project phase, All the relevant info is where it can be referenced...
New thread,... No reference,.... equals Confusion....

Btw,... I asked ya another question in yer 1st thread....

St. A

There's no contractor to call as the work was done years ago before I owned the house. But in any case, there is no fault, the concrete was graded, presumably for drainage away from the house. I just want to level part of it so I can build something on top of the level foundation. Thanks- Aaron

PS- Spanked about starting a second thread. Wasn't trying to break any rules of etiquette here. I was just trying to help by simplifying the question. On other forums where I am an active member, I know users often search for subjects by title and I thought clearing up mine would aid in other people's searches. Sorry for any confusion I may have caused. Thanks for your help- Aaron

itsreallyconc

is this a buried wall OR slab ? maybe a picture's a good idea

forget those other forums - ALL the good guys are here

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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help
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md2lgyk

What is it you want to build? Your slab isn't a "foundation" and likely has no footers.

Bondo

Ayuh,... Click on the links in post #4 to find his Other thread, with all the Information...

Canarywood1

Not a good idea to go from "0" to 7 1/2 inches,the "0" end should be at least 3 inches thick,and a good bonding agent applied for 3-4 feet.

St. A

Canarywood- Thanks for your reply. Is the feather edge always a bad idea? If it is an issue of traffic/ weather, would thinset/ tile over the top mitigate the degradation problem or is it another issue like brittleness in the thin feateredge? Thanks again, Aaron

Canarywood1

Feathering to "0" is always a bad idea,and thinset and tile would not mitigate the degradation problem,i've never seen it work in my 35 years in the business.

St. A

Thanks Canarywood. I sure appreciate the information. I asked another similar question in another section of the forum- basically using sleepers over vapor barrier over concrete to attempt the same thing- a level floor for a living area. If you have the time, I'd be curious if you'd ever seen this or another solution to this problem. -Aaron

Small Wood Shop on Grade

sixeightten

We have done that before. Cheaper than the concrete also. I didn't read the other thread so I am just going by what you have here.

Canarywood1

[quote=St. A;1081868]Thanks Canarywood. I sure appreciate the information. I asked another similar question in another section of the forum- basically using sleepers over vapor barrier over concrete to attempt the same thing- a level floor for a living area. If you have the time, I'd be curious if you'd ever seen this or another solution to this problem. -Aaron



That would be a much better and a lot cheaper solution to your problem,just be sure to use PT sleepers.

St. A

Last question and then that's it (until the next time ): Should I anchor the sleepers to the concrete? If so, with what? Thanks again all. -Aaron