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Old 05-11-2013, 08:00 PM   #1
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Raising garage floor


There doesn't seem to be much info on this and thought I'd ask. My attached garage is about 4 inches or so lower than my living area. I will be converting my garage to living space.

I needs some tips on pouring over the slab.

1.) Do I lay a membrane?
2.) Do I add joints the same as the garage floor to allow expansion?
3.) Any special forms needed where the concrete ends at the garage opening?

I search the forum and couldn't find anything. Maybe someone can direct me to a website or video?

thanks

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Old 05-11-2013, 08:19 PM   #2
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Why not just frame over the concrete to bring it up? Better for insulation, wiring/plumbing runs, hvac, etc.

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Old 05-11-2013, 08:25 PM   #3
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Why not just frame over the concrete to bring it up? Better for insulation, wiring/plumbing runs, hvac, etc.
Suppose I could, but I'm in Arizona. Everything is built on slab. Just doesn't get cold enough. It was 99 today...If I frame over the concrete, I'm not sure how difficult it would be to keep the framing level to accommodate the slop to the existing slab.
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Old 05-11-2013, 09:44 PM   #4
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You can pour a new slab over the old one---

I'm not a concrete guy--but I've seen it done---someone here will know the steps---Mike----
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Old 05-12-2013, 01:37 AM   #5
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Originally Posted by Daugela View Post
If I frame over the concrete, I'm not sure how difficult it would be to keep the framing level to accommodate the slop to the existing slab.
Not much harder than any other framing. You'd just need to rip the floor joists with the slope angle. Not terribly difficult to do.
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Old 05-12-2013, 05:50 AM   #6
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Raising garage floor


If I were you I would frame the floor. You can go at your own pace & if you want to turn it back into a garage you just rip the floor out ( garage floors need to be lower than the living space to keep the exhaust fumes out).

By the questions you are asking you don't want to learn how to pour a garage floor in 99 deg. heat. Once the truck shows up it is game on & there's no stopping until you are done. You are worried how you going to get a wood floor flat wait to you try to get a concrete floor flat.

Since, the new floor is 4" thick I would just pour over the old one, put the joints in the same place ( unless you use a membrane), use 6" x 6" x 6/6 wire mesh , rip a 2 x 6 down to form the opening & support the 2 x 6 every 2 ft. Sounds simple & looks easy until you go to do it.
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Old 05-12-2013, 10:58 AM   #7
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If I were you I would frame the floor. You can go at your own pace & if you want to turn it back into a garage you just rip the floor out ( garage floors need to be lower than the living space to keep the exhaust fumes out).

By the questions you are asking you don't want to learn how to pour a garage floor in 99 deg. heat. Once the truck shows up it is game on & there's no stopping until you are done. You are worried how you going to get a wood floor flat wait to you try to get a concrete floor flat.

Since, the new floor is 4" thick I would just pour over the old one, put the joints in the same place ( unless you use a membrane), use 6" x 6" x 6/6 wire mesh , rip a 2 x 6 down to form the opening & support the 2 x 6 every 2 ft. Sounds simple & looks easy until you go to do it.
I know it wouldn't be terribly hard to rip the joists, but again, since it's only 4", figured it would be best to pour over. I do however think the shallower the difference is, the more difficult the ripping would be. Especially at the beginning point.

Regardless, you write that I shouldn't do a membrane if I use the same joints. Why not a membrane? I've laid my share of walkways, etc, but not a garage and needed to be sure about any do's and don'ts. thanks
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Old 05-13-2013, 03:29 AM   #8
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w/o seeing the condition of the existing floor ( jnt pattern/random crks ), we'd recommend an unbonded overlay incl referencing existing jnt pattern into the overlay,,, might also have to increase jnts due to 4" depth but that's an on-site call,,, for membrane, 6mil plastic orroofing paper,,, we wouldn't incl wire mesh - too difficult holding @ correct elevation while conc jabonies are tramping thru all the mud
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Old 05-13-2013, 09:22 AM   #9
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By the questions you are asking you don't want to learn how to pour a garage floor in 99 deg. heat. Once the truck shows up it is game on & there's no stopping until you are done. You are worried how you going to get a wood floor flat wait to you try to get a concrete floor flat.
Oh man, this is dead-on right. I did a slab for a hot tub, maybe 7x10 on what was nearly the hottest day of the summer. It was all I could do to get the surface flat and cleanly finished before it started to set up. Barely got the edges smoothed. I shudder to think how much more trouble it'd be to do a garage-sized area.

I would absolutely lean toward hiring a crew to do it right. But then I'd rather frame up something like this instead.
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Old 05-13-2013, 10:40 AM   #10
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"I did a slab for a hot tub, maybe 7x10 on what was nearly the hottest day of the summer. It was all I could do to get the surface flat and cleanly finished before it started to set up. Barely got the edges smoothed. I shudder to think how much more trouble it'd be to do a garage-sized area. "


The simple solution to pouring on hot summer days is to have your supplier add a retarder,but then you have to know about these things,and ask if you don't know,that's what these forums are for.
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Old 05-23-2013, 11:53 PM   #11
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I hired that very job done to my 2 car garage back in 1983. No way I wanted to tackle it. The guys did a good job, added reinforced steel wire and finished it out smooth. I closed it in, added an AC and never looked back. I had built a three car garage in the back yard so closing in the garage and bringing the slab up to grade level turned out nice.
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Old 05-24-2013, 12:01 AM   #12
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I hired that very job done to my 2 car garage back in 1983. No way I wanted to tackle it. The guys did a good job, added reinforced steel wire and finished it out smooth. I closed it in, added an AC and never looked back. I had built a three car garage in the back yard so closing in the garage and bringing the slab up to grade level turned out nice.
Did you have an issue with ceiling height?

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