building subfloor

Old 09-24-04, 10:39 PM
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building subfloor

I would like to convert my attached garage into a master bedroom. The cement floor is not level so I need to build a subfloor (it is also lower than the existing floor of the house).. The garage is 20'x20' and I plan to use 2"x8"x12' at 16" centers. How high above the cement floor should I build and should the joists be butted or overlapped? What should I do about the existing vents at floor level? One more ? please. What would be the best way to brace the floor joists? I plan on carpeting the room. As you can tell I have all kinds of experience building sub floors. Thanks so much for any help you can give.
Old 10-01-04, 06:24 PM
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this what l would do

The first thing that l would do is put down styrofoam insulation on the floor because of the cement floor and just start your floor joists on top of it and l would use joist hangers to hang the joist from .
you also can run your vent for the floor in between the joist .

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