Is it advisable to use the hi rib cementing style to correct the whole un level wooden second floor area? It is not level from between 1 to 2 and 3/4 inches in certain areas.
Concrete – Can Hi-rib cementing be used to level a second story floor
self-leveling-concrete
Related Solutions
I like taking small crowns out of concrete floors with diamond cup wheel attached to an angle grinder... Need a shop vac and a masked helper. You may be able to rent both.
When you have floor drains, the installer should have established a fairly smooth slope toward those drains into the floor as part of the process of "floating" (levelling and smoothing) the surface of the concrete. This is slightly annoying but not difficult -- I've done it for summer-camp shower houses, as a mostly-untrained volunteer -- so a pro should have been able to handle it. If it's really their error (rather than someone tromping around in the wet cement after they levelled it but before it hardened), I agree with @MichaelKaras that it's their responsibility to figure out how to fix it.
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Best Answer
No. Hy-Rib is an exterior industrial product not intended for residential use, and IIRC you'd never cover it completely w/ less than 2 full inches of concrete, adding an incredible amount of weight to your WOODEN structure.
If your floor is that far out of level, that suggests problems in the underlying framing. The best fix is to correct from the bottom up - start in the basement and adjust the 1st floor to level or as near level as possible, then repeat working your way up the house.