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Old 10-07-2009, 09:41 AM   #1
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Garage Floor slope

Getting ready to pour a new garage floor. I need to slope it towards the door. What are the recommended minimum and maximum slopes for a garage floor?

I want to be sure it drains well as there will likely be lots of melting snow coming off the cars and I will be washing cars in the garage at times.
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Old 10-07-2009, 09:43 AM   #2
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Min slope I was told by my building Dept is 1/4" every 4'
Not sure on a Max, or if there really is one

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Old 10-07-2009, 09:59 AM   #3
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In WI, there is no min. or max. listed in our code.

We usually set for 3-4" total in a normal depth garage.

Anything deeper than 24', we generally leave the back level & only pitch the front 20-24' to the OH doors. This allows a nice level area in the back for fridges, work bench, shelves, etc...

1/4" per foot is excessive IMO, as long as the floor is fairly flat (no deep bird baths), 1" every 6-8' is sufficient.

Keep in mind, the short walls adjacent to the OH door should also have minor pitch (towards the OH) to avoid water pooling in those corners.
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Old 10-07-2009, 10:16 AM   #4
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1/4" over 4 feet will drain but slowly, much over that and front to rear on a 28 to 30 foot garage is becomes noticeable. This will add cost but if you will have a lot of snow and ice melting off the cars you might want to put a couple of drains in the middle of each bay. Use 1/4 to 1/8 per foot slope to the drains and you will not have a problem. This will keep the salt and dirt off your driveway. Just be sure to install drain basins you can easily clean out with a shovel.

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