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Old 04-20-2010, 02:57 PM   #1
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Concrete floor


I am looking to remodel my garage.
Currently I have an asphalt floor that extends out to the driveway, since my house is a little old. I am looking to put in a concrete floor in it's place.

Where do I start? Can I pour a floor directly over the Asphalt or must it be ripped out to the crushed stone first. any type of concrete I should use, do I have to leave a gap between the new floor and the foundation.

Any help on this subject would be appreciated

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Old 04-20-2010, 04:12 PM   #2
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Concrete floor


Where are you located ?

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Old 04-20-2010, 04:47 PM   #3
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Concrete floor


depending on the elevations ( floor - garage sill plate - driveway ), sure,,, just might have to work around a couple things !

you mention foundation which's another issue - what's holding up the garage ? we regularly paved conc over asphalt ( called a ' trueing & leveling course ) hgwys & especially runways.

as dave asked, ' where ? '
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Old 04-20-2010, 09:27 PM   #4
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I'm in Ottawa, Ontario, Canada
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Old 04-20-2010, 09:57 PM   #5
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Concrete floor


The Garage is resting on a concrete foundation, I'm just not sure what the underlying structure is like
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Old 04-23-2010, 02:03 PM   #6
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Concrete floor


You can pour a new concrete floor over asphalt. I would want to make sure the asphalt doesn't heave in the winter and would want to make sure raising the floor height 4 inches won't create other problems that might cost more than removing the asphalt. I would lay some poly on top of the asphalt before pouring the concrete. This will help keep moisture to a minimum and prevent the concrete from bonding to the asphalt. Concrete needs to be free to expand and contract on its own or you will get more stress cracks than normal. Make sure you saw some expansion joints, at least one down the middle each way to help prevent ugly looking cracks. I would use a 3500 3/4 psi mix design with fibermesh or wire mesh reinforcement. For a 2 bay garage you don't have to leave a space between the foundation and concrete floor, if it's larger then some expansion foam can be glued on the foundation before you pour.
http://www.everything-about-concrete.com

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