A plumbing contractor had to dig up the floor in my bathroom, then reinstall the concrete floor. The initial floor installation was not level and had a hump in te middle. The first attempt at correction was to pour a small amount of allegedly self-levelling concrete, which was badly poured, with gaps, still not close to level, and which upon drying had cracks, then essentially broke when stepped on. The next fix was to pour more concrete. Since I did not view the installation myself, I am not surw if they poured the new concrete over the prior failed repair concrete, which was both cracked and broken and sat on the floor like a pancake on a pan. (Though the person who was there quoted the guy as saying that removal of the concrete from the prior fix was not necessary.)
1) Even if they did rip out the old concrete from the failed repair, does pouring the floor in two parts damage the structural integrity of the floor and/or limit its expected life span? If so, by how much?
2) If they failed to rip out the old concrete from the failed repair, so the floor is now poured in three parts, with the middle one cracked and broken, does this multi-part pouring, with broken and cracked concrete in the middle, damage the structural integrity of the floor and/or limit its expected life span? If so, by how much?
Thanks.

To start with don't let plumbers do any type of finish work... lol

You may want to cut out the bad section of floor and redo it, make sure you bed it in sand and pack it down well, pour the concrete and make sure it is level, it shouldn't hurt the structure of the floor if it's done right, Ive done it a lot myself when busting up concrete floors to repair plumbing.

Yep... your best solution may very well be... cutting out the bad section(s) and re-pouring. To prevent significant cracking trouble and potential buckling of the new patched areas you should use some sort of expansion material at all of the edges that are surrounded by concrete that you haven't replaced.

Self-levelling concrete is a misnomer.

You didn't metion what your flooring will be... it is possible that if the added concrete could be chipped off, that the flooring could be installed over an underlayment patching product. This won't work under ceramic, but it would under other flooring.

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Originally Posted by mikey2007

self-levelling concrete is a misnomer.

you didn't metion what your flooring will be...it is possible that if the added concrete could be chipped off, that the flooring could be installed over an underlayment patching product. This won't work under ceramic, but it would under other flooring.

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Over the concrete goes linoleum. Thanks.