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Old 01-24-2012, 02:21 PM   #1
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Garage with a basement


How possible / practical is it to put a basement under your garage? Obviously, you'll have the extra weight of cars and have to support a concrete floor from below (unless you went with steel floor?)

I can see why no one really has one - just seems like it might be cool.

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Old 01-24-2012, 02:30 PM   #2
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I can see why no one really has one - just seems like it might be cool.
Because most people are not millionaires. Being a millionaire would be cool also.

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Old 01-24-2012, 02:46 PM   #3
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Garage with a basement


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How possible / practical is it to put a basement under your garage? Obviously, you'll have the extra weight of cars and have to support a concrete floor from below (unless you went with steel floor?)

I can see why no one really has one - just seems like it might be cool.
Both possible and practical. I know a guy who did it and its like a secret man cave. You have to go through a bookcase to get in there. He has a free flowing keg and bar, with pool table, big screen etc. It can be done for sure. He used I think open web steel joists and concrete decking to get it done.
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Old 01-24-2012, 03:33 PM   #4
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Garage with a basement


Well, really if you look at what holds up a car on a 4 post lift, then of course it's within the realm of possibility. It's extra expense and complexity, and it wouldn't be done because how often is the square footage at such a premium that the living space achieved couldn't just go somewhere that the structural complexity isn't required.

Personally, I've thought if I was building a detatched garage again I'd go for a service pit.
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Old 01-24-2012, 03:42 PM   #5
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My friend's parents built a house about 2007-2008 with a 2 story garage. The front of the house has garage access that would be upstairs. A driveway goes around behind the house and down a hill with more garage doors on the rear of the house for the lower garage. It's pretty damn awesome, if you ask me.

Here's an aerial shot to see what I'm talking about:
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Old 01-24-2012, 03:58 PM   #6
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Worked on a basic 70's bungalow that had it. Sop below the garage.
Used 2x10 joist 12"oc, had a metal pan made for the floor with a drain in it.

We converted the once garage to living room, entry, bathroom.
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Old 01-24-2012, 04:45 PM   #7
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One concern (besides the obvious). Fuel vapors are heavier than air. Your basement could easily become smelly/dangerous/explosive. That's one reason automobile service pits aren't as popular as before.
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Old 01-24-2012, 05:22 PM   #8
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Garage with a basement


Depending on you site, using the area under a garage can be a valuable and economical space.

The obvious is for storage and a utility area where you can drive in a tractor, protect it, work on it and keep accessories and other exterior tools.

To use it as a real livable space requires more planning, access, fire requirements and construction details that cost more.

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Old 01-24-2012, 05:44 PM   #9
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It is very common around here. They use pre stressed concrete then pour a cap over that. The rooms are normally storage/safe rooms.
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Old 01-24-2012, 05:52 PM   #10
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Garage with a basement


Quote:
Originally Posted by tibberous
How possible / practical is it to put a basement under your garage? Obviously, you'll have the extra weight of cars and have to support a concrete floor from below (unless you went with steel floor?)

I can see why no one really has one - just seems like it might be cool.
I worked on a house that had one with two bedrooms underneath. The floor wad concrete and steel. Can be done no problem. Same way as parking garages are done. Like anything else...had to be designed by an engineer.

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