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I am having difficulty with a floor over a crawl space since we had a French drain put in the centre of my house has dropped 1.5" what do I need to do to bring level again, our base is basicly sand. cant afford a contractor living on SSI. so will have to fix myself with some great help from here allan

Is the French drain in the area of any supports for the floor system ( beams,joist or headers). The drains might have comprimised footings or support in that area. You may need to pour footings and block up piers to the heigth needed. Might neccesitate jacking what is there up 1-1/2". You may have to pour more than one and place a beam under the affected area to cover more than one floor support. Without seeing exactly what you have this would be my best guess.

What Red said, but if you are living on SSI, you are probably not physically able to make the necessary repairs. Sorry, but I think you will have to pay a pro.

A French drain should not be under your house or very near it. It is probably causing the ground to sink, which could be the cause of your problem.

If your soil has sunk, it will probably continue to do so to some degree. Your easy fix might be to use adjustable posts set on concrete piers so you can make future adjustments. But again, this will require that you do some heavy work under the house

Pardon me for being picky but punctuation would make your message more readable.

Many thanks for the help, I may be on SSI but that's only from age, not ability. again I really appreciate the responses. hope we talk again allan sr