Garage With a Basement?

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Old 05-14-05, 09:48 PM
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Garage With a Basement?

Anyone built a garage with a concrete panel floor and a basement underneath?

I am considering rebuilding my existing garage and adding an area about 14 feet by about 20 feet. This will be added to an area about 22 feet by 20 feet. The existing slab is just about perfect, so there is no need to demo and remove. My home is on a slab, so going down is impractical, and going up for shop/storage space is also impractical. Moving results in housing that is too expensive for me or a long commute, so I see the possibility to add about 300 square feet of much needed storage/storm shelter space at the same time as the addition.

Excavation would be around 9 feet, dirt would have to be trucked off site.

Access would be through exterior stairs through the foundation.

Anyone have rough numbers for a project like this?
 
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Old 05-15-05, 07:53 AM
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Basement Garage

Yes, I have built 2 of them. One was just last year. However, neither had a concrete floor. The reason being there was no way to hold up the concrete floor without tremendous expense. Even though that was what the owners wanted, I showed them the expense problem, but I also showed them how to do it with less expense. I built the garage floor out of wood. The substructure is the same as building a trestle. Both owners were very happy, and both work excellent. If I understand your question correctly, you want to add an addition onto your garage with a storm celler under it. It should work perfect using wood. Do you want to park on this new area, or just use it for storage.
 
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Old 05-15-05, 12:44 PM
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I have no intention of parking a car over the space, but the workbench I have with the material stored on the shelves weighs more than my car. The workbench is about 5 foot x 10 foot and is over 1000 pounds by itself.

I was thinking of something like Span Crete panels with a 2 inch grout coat for the floor. Would need a big crane to lift them over the house and into the back yard, but that isn't a big deal.
 
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Old 05-15-05, 04:21 PM
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You would need to support the concrete with steel beams and steel decking, steel supports, etc. Its not a small job and you would need to hire one of those engineering gurus to spec it out. Go ask your local municipalities code office what they require (if they even know..).
 
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Old 05-15-05, 04:32 PM
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Almost anything can be built if you throw enough money at the problem... There is a reason that 99.9% of all garages are slabs on grade and without basements.
 
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Old 05-15-05, 07:24 PM
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What's with all the steel? I have been involved in the construction (not the concrete part) of many buildings with Span Crete floors. I worked on a multistory condominium project with cement block interior walls supporting Dynacore prestressed panels with a 45 foot clear span.

Even if the panels went in the 20 foot direction, there should not be a need for steel beam reinforcement.

The owner of a recent project told me that the prestressed panels were significantly cheaper than conventional poured concrete over steel bar joists and they gained about 20 inches of headroom.

It may be more expensive to build something like this, but I do not understand how so many expensive homes with 3 plus car garages waste so much square footage by not making a basement under the space. The concrete costs should be close because the panels are not solid, so the major expenses would seem to be the excavation and removal of the dirt and the equipment to deliver/install the panels. Of course, I haven't priced it out yet, so it may be rediculously expensive.....
 
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Old 05-15-05, 10:42 PM
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Basement Garage

Since you are not going to be putting a car on it, why don't you build it using foundation treated lumber ? It would be strong enough to put a car on, and about 1/3 the cost of concrete, with no steel, or concrete panels. That way, you could even finish the basement area, and use it even if there was not a storm.
 
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Old 05-16-05, 02:16 AM
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Guess it is time to talk to an architecht and engineer.
 
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Old 06-19-08, 01:11 PM
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Question for you

Originally Posted by Jack the Contractor View Post
Since you are not going to be putting a car on it, why don't you build it using foundation treated lumber ? It would be strong enough to put a car on, and about 1/3 the cost of concrete, with no steel, or concrete panels. That way, you could even finish the basement area, and use it even if there was not a storm.

Have you ever done this? I am having problems finding plans to build a garage with a basement. This sounds like a great idea using Foundation Treated Lumber.
 
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Old 09-05-08, 09:39 AM
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Hello, did anybody come up with any plans for doing this with a wood floor?
 
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Old 11-08-10, 06:18 PM
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I think not....lol......
Back to the concrete/floor....which I know nothing about...
This garage was built in 1950, so it could be a storm or fall-out cellar!
Quite the collectors item if its "fall-out".
IMO, wood(really thick and strong, of course) makes a great garage floor.
That 99.9% of garages are on a slab makes perfect economic sense....
And, to think a second, parking my car on this 60 year old floor is ricky... even with its 4 steel I beams.
 
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