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Junior Member
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Dec 5, 2008, 02:48 PM
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Floor joist sizing,
I have sistered on 2 x 8's to my existing attic floor. It originally was framed with 2 x 4's and then 2 x 6's were sistered along to them. All the 2 x's are resting on the top plate. It feels sturdy enough to lay subflooring onto, but it is a twenty foot span. Will this be adequate?
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Ultra Member
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Dec 5, 2008, 03:21 PM
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I would say yes with a 3/4 plywood.But what supports the center of that span?
Is there a wall below this span?A post perhaps?
Back to you.
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Junior Member
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Dec 5, 2008, 03:50 PM
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There is no center supports for the span, this is above a garage. It does have a little flex, but I a little is not an issue. I am more concerned about putting a compressed bamboo flooring on it. Also the subflooring is 7/8'' tongue in grove chip board.
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Ultra Member
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Dec 5, 2008, 04:09 PM
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I take it you haven't pulled a building permit for this project?
What is the purpose of the floor being installed,is it for storage,or an apartment?
This is necessary to give you the proper advice.
KBC
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Junior Member
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Dec 5, 2008, 04:20 PM
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No permit. It's a small reading room above my garage. Barely any livable space in room to start (the roof is pitched). This will never be a "legal" space (ie no heat, undersized door, etc), just a small bit of extra dead space being uitilized.
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Ultra Member
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Dec 5, 2008, 04:25 PM
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Check.
This being the case,the sub-flooring might be just fine.I would be concerned about the deflection in the middle.
Maybe some more ideas will crop up tonight and/or others will have an idea or two.
I have paved the way for them to answer you!
KBC
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Junior Member
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Dec 5, 2008, 04:30 PM
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My worst case scenario involves to simspon brackets, a 2 x 8 running perpendiculiar underneathe (in the garage) and a lot of sinkers. Although the room may look like it was designed for a hobbit, I'd like to keep the fun house motif isolated to one room ;)
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