My New Shop!! Yiippeee!

6pk2goDemon said

Sorry that you had a bad experience on the Garage Journal forum. There truly is a wealth of info to be had from there.

The thread you reference above is talking about a 2 post lift and leveling issues from right to left. It looks like you're planning a 4 post lift, so not really much of an issue. You should slope slightly back to front for drainage. Maybe 1/8" on 12 or so. You won't notice it at all, but slope just enough to let gravity do its thing.

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I it kind of hit me this afternoon that I was going for the 4 post lift and that it would be a different issue with it.

I can't remember the rule of thumb when sloping concrete. I found by looking on the internet ½" per yard for garages. So I have 30' which is 10 yds so that would mean I would slope it 5" That seems a awful lot but I guess that would work considering it being 30' long.

It goes on to state that for driveways you use 1" for each yard. That is more because it will get heavy down pours of rain and needs a little extra lift.