Sloping existing concrete floor to drain

Old 01-01-14, 12:02 PM
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Sloping existing concrete floor to drain

I'm planning to adapt an existing concreted bay in a pole barn to be a milkhouse for a small dairy we're opening. The slab is very thick and flat, not sloped. State law requires us have it graded to drain. As this room will be housing dairy equipment to be washed, it will be wet a lot of the time. The size is 20X12 and its got a wood frame flush to the slab exposed as its just wood frame and metal siding. My question is what options do we have to do this?

Can you grind down the floor in the middle? Or tile over it and build it up underneath the tile? If we did the tile option, would there need to be a waterproof barrier between the unsloped floor and the tile?

I'm pretty clear on installing the drain, but I'm just having some trouble trying to figure out the slope issue. I'm looking for the easiest most economical way to do this. Even if I end up hiring this out to a professional, I'd still like to have an idea of whats best so I don't get taken advantage of.

Old 01-01-14, 01:55 PM
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Since your slab is nice and thick, I would get a quote for grinding it down as needed. The modern diamond surfaced grinders will make short work of the job. To start I would set up a water level to mark the side walls and run some strings across so I could get an idea as to exactly what has to come off. The floor may be flat, but is it level? A mason's string can still sag, so pull it very tight or use nylon fishing line. Having sturdy eye hooks around the perimeter give you and whoever grinds it down a way to run a string quickly to check the progress.

Another option, if you feel comfortable, would be to rent a grinder and DIY. I ran a floor machine for a couple of years so handling a grinder wouldn't scare me, but talk to a rental co to see what that option amounts to.

Old 01-01-14, 04:08 PM
Join Date: Dec 2013
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impo, best machine for this job's a scarifier 1st,,, you can establish slope then grind to flatten corduroy finish left by scarifier,,, other issues: 1, is there a rqd slope to the floor for drainage; 2, is there now a drain OR do you have to install it; 3, where will the drain lead; & 4, the whole floor must be sloped OR just a drainage trench in the ctr ?

either wtr level, laser, or 4' level taped to a 2x4 works well

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