Grinding concrete to reduce/create angle

[glsmaverick]

I am planning on doing a floor covering in my garage this September and I am either going to go Racedeck for my first choice or epoxy as my second. The only thing that concerns me is that my house has settled since built (2003) and now the water drains away from the door toward the center of the garage. Its not bad and the concrete is in very good condition but I thought I would solve the problem before improving the floor.

My question is, can I grind away like a 1/4" over say 10' toward the door to create a slope? I would really rather not put another coat of concrete on the floor since it still looks pretty much brand new. The PO (I bought it last year) used it to park his trailer and other yard equipment so it really never saw any use.

 

[Edger]

Grinding that much will be a big pain.

I figure you could grind 100 sq.ft. per hour average using a hand held 9" grinder with a 7" disc and dust shroud, see http://situp.com.au/Concrete Grinder.html and take off 1/32" each time if you had the right type of diamond wheel. You have to do the math on how much area you have and how many passes it would take.

On your first pass you might easily take off twice that amount and slow down dramatically as you get into the stones, depending on whether they are considered hard, medium or soft.

The fastest way would probably be with a gas powered stand up grinder and use it wet so it cuts into the stones better. When grinding wet you use just enough water to work in a wet mud and this keeps the diamonds sharp, open and cool. Clean up is pretty bad, but dry would not work for you without special "soft bond" diamond segments.

For more info on how diamonds work when grinding concrete see http://situp.com.au/Grinding Hard Concrete.html

If you used one of those it would be possible and pavements are commonly ground like that except that pavements are only 3 feet wide and they only grind about 3-6 inches back.

 

[dangle]

cut a small "channel" (the width of the blade on a concrete saw) where the lowest point of the "channel" is at your garage door.

You can then squeegee/broom any water into the "channel" and away it goes out your garage door.

As far as this working for your racedeck flooring? It wont

 

[glsmaverick]

cut a small "channel" (the width of the blade on a concrete saw) where the lowest point of the "channel" is at your garage door.

You can then squeegee/broom any water into the "channel" and away it goes out your garage door.

As far as this working for your racedeck flooring? It wont

Thats a good idea; i will probably go this route. I figure once I lay the racedeck I can cut the grooves where I will lay the free flow tiles so it all corresponds.