Thanks every one for the feed back.
I do have a few people working with me so the labor isnt a problem, I have experience in leveling floors but nothing on this size.
I will take your advice and hire a pump mixer, i fancy having a go. and like sWe said, it can be a lucrative business. The thing with this job is they have already had the floors done but thes ones need leveling are pretty bad.
I dont want to lose the contract ove the cost of the additional labor for the leveling so i will tackle it.
He isnt to happy about having to pay for it twice anyway .
Wish me luck

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Very usfull video, thanks