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Old 01-18-2012, 09:51 PM   #16
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Question about slope of garage slab foundation


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Originally Posted by ddawg16 View Post
Recheck your math....his spec was 1" per 10'....on a 24' garage, that would be about 2.5"....which is a lot. My garge is 25" and it slopes about 1"....and I don't have an issue getting water out.

pttc.....I would 'highly' suggest stem walls. Without them, your going to be cutting every single 2x4 stud a different length if you want you roof to be flat.

Click on the link in my signature for the Garage build....I went through it about 2 years ago.

Mike was referring to the minimum I suggested, not the min. mentioned by the OP, at least from what I can tell.

After looking at your garage build picture, it appears you could have really benifitted from a little additional pitch on the garage floor. The ramp to the garage must drop 5" in 3'................

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Old 01-18-2012, 09:59 PM   #17
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Question about slope of garage slab foundation


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Originally Posted by jomama45 View Post
Mike was referring to the minimum I suggested, not the min. mentioned by the OP, at least from what I can tell.

After looking at your garage build picture, it appears you could have really benifitted from a little additional pitch on the garage floor. The ramp to the garage must drop 5" in 3'................
I think the pitch is fine....any more and I would find it uncomfortable to walk on....I do a lot of woodworking and I like a flat floor....but if water does get on it...it flows out fine.

As for the ramp into the garage....sore point....I was pissed at the contractor for making it so steep.....

Once I'm done with my 2-story addition...I'm going to replace the existing driveway with one without 'cracks'....and I'll saw cut the ramp and make it more gradual....
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Old 01-18-2012, 10:02 PM   #18
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Question about slope of garage slab foundation


We usually run 2 to 2.5 minimum on 20' slabs here.
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Old 01-18-2012, 10:18 PM   #19
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Question about slope of garage slab foundation


Interesting thread guys. I guess everybody does it a little different depending on where you are. Most of the attached garages around here get a drain in the middle that is tied into the sanitary in the basement. With the drain in the middle of a 24' x 24' garage, the guys usually pitch everything towards the drain in the middle with 1 1/2" being the fall. In my shop I have two areas. One is 28' x 56', the new addition onto that is 28' x 36' to make the building an ell shape. The original floor is poured flat with no drains. I didn't want any pitch in my shop area. When I do park in there, the snow melting off my van will leave a slight puddle around the wheels, most of the water hits the cut joints and finds its way out. The new addition we poured the floor flat except for the first 9' coming in from the doors. That area has a 3/4" pitch. I am planning on putting a twin post auto lift in there on one side and it calls for a flat floor.
I definitely agree with the stem wall. Around here the bottom plate has to be at least 8" higher than grade.
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Old 01-18-2012, 10:23 PM   #20
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Question about slope of garage slab foundation


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Originally Posted by ddawg16 View Post
I think the pitch is fine....any more and I would find it uncomfortable to walk on....I do a lot of woodworking and I like a flat floor....but if water does get on it...it flows out fine.

You "Think" it would be uncomfortable, but the reality is you wouldn't ever know the difference unless you could eyeball it next to the level curb. ANd, there's no correlation between a flat floor & a pitched floor. You can have both in conjunction, and they have no bearing on each other.

As for the ramp into the garage....sore point....I was pissed at the contractor for making it so steep.....

Other than replacing alot more of your driveway or putting more pitch on the slab, what other option did he really have?

Once I'm done with my 2-story addition...I'm going to replace the existing driveway with one without 'cracks'....and I'll saw cut the ramp and make it more gradual....
I think you're missing my main point here. You paid a professional to install the floor, with minimal pitch, and it still shed water to your satisfaction. For someone to attempt this with little to no experience, they're likely to have puddles or "duck ponds"......
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Old 01-18-2012, 10:30 PM   #21
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Question about slope of garage slab foundation


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Originally Posted by firehawkmph View Post
Interesting thread guys. I guess everybody does it a little different depending on where you are. Most of the attached garages around here get a drain in the middle that is tied into the sanitary in the basement. With the drain in the middle of a 24' x 24' garage, the guys usually pitch everything towards the drain in the middle with 1 1/2" being the fall. In my shop I have two areas. One is 28' x 56', the new addition onto that is 28' x 36' to make the building an ell shape. The original floor is poured flat with no drains. I didn't want any pitch in my shop area. When I do park in there, the snow melting off my van will leave a slight puddle around the wheels, most of the water hits the cut joints and finds its way out. The new addition we poured the floor flat except for the first 9' coming in from the doors. That area has a 3/4" pitch. I am planning on putting a twin post auto lift in there on one side and it calls for a flat floor.
I definitely agree with the stem wall. Around here the bottom plate has to be at least 8" higher than grade.
Mike Hawkins
Mike, if you consider that you're dropping that 1.5" in only half the distance (12' at most), you'll see that it's the equivalent to 3" in 24'. 3" really isn't that much different than the 3.5" I mentioned earlier...........

I certainly agree though that different regions have different requirements. Parts of the South that don't get freezing precip. dropping off of parked vehicles, or much rain, likely don't need the same amount of pitch. Also, dry concrete will absorb fairly large amounts of water more rapidly if the pitch isn't sufficient.
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Old 01-18-2012, 10:39 PM   #22
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Question about slope of garage slab foundation


If I'm just trying to run water I use an 1/8 per foot as a min. slope. We do monolithic garages all the time here as long as they meet requirements for frost protection. I don't usually slope detached garages. I just slope the approach pad and drive way.
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Old 01-18-2012, 10:48 PM   #23
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Question about slope of garage slab foundation


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I don't usually slope detached garages. I just slope the approach pad and drive way.
Could you explain a little bit why you don't usually slope detached garages? Thanks!
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Old 01-18-2012, 10:57 PM   #24
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Question about slope of garage slab foundation


It's not required. At least not in Utah. And it totally depends on intended use, if your not going to be hosing the floor down how is water going to get inside? Your door will have a weather seal that will prevent rain fall from getting in. Now if you need to be able to spray down the floor you should slope it but then you don't want a mono slab, you want stem walls with the floor set below there grade.
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Old 08-04-2013, 03:24 PM   #25
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Question about slope of garage slab foundation


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HI Pete, (I'll just call you Pete if you don't mind) a monolithic slab is fine yes.

But usually you will have a detail something like this to show the garage wall attachment to the foundation showing a stem wall.

Your plans do not have this?

This is just something I threw together to illustrate, your plans would be much more detailed than this.

Andy.
I hope this reaches Andy???
I saw your sketch in a post from 1/2012. It's exactly what I want for my garage.I haven't been able to find instructions, diagrams, pictures of the framing to construct to create the monolithic footer/slab/stemwall you described. Is there a web site, how to book, or whatever that I can obtain to see how this would be formed?
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Old 08-05-2013, 08:31 PM   #26
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I hope this reaches Andy???
I saw your sketch in a post from 1/2012. It's exactly what I want for my garage.I haven't been able to find instructions, diagrams, pictures of the framing to construct to create the monolithic footer/slab/stemwall you described. Is there a web site, how to book, or whatever that I can obtain to see how this would be formed?
Pretty sure Andy draws for a living, I'm sure he could hook you up with whatever you need for a small fee..............
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Old 08-08-2013, 03:51 PM   #27
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Question about slope of garage slab foundation


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I hope this reaches Andy???
I saw your sketch in a post from 1/2012. It's exactly what I want for my garage.I haven't been able to find instructions, diagrams, pictures of the framing to construct to create the monolithic footer/slab/stemwall you described. Is there a web site, how to book, or whatever that I can obtain to see how this would be formed?


Don't know if this will help,but i like the wall to be 6/8 inches higher than the slab.

http://www.google.com/imgres?imgurl=...9QEwDA&dur=232
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Old 08-08-2013, 04:40 PM   #28
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Question about slope of garage slab foundation


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Originally Posted by cmctyankee View Post
I hope this reaches Andy???
I saw your sketch in a post from 1/2012. It's exactly what I want for my garage.I haven't been able to find instructions, diagrams, pictures of the framing to construct to create the monolithic footer/slab/stemwall you described. Is there a web site, how to book, or whatever that I can obtain to see how this would be formed?
Look at the pics in my Garage build link (in my signature).

Depending on where you are, you might need drawings from an architect.

Any decent concrete guy will know what to do.

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