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Old 02-02-2008, 01:43 PM   #1
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Basic T&G Plywood Installation


New to forum - great info here.

I am looking for basic guidlines on installing 3/4" T&G flooring on attic floor joists that are 2X8 and 2X 10" 16 inch on center. Interested in how to arrange the geometry of the plywood flooring on the joists. I read that the plywood should be screwed and glued and that the long dimension should run perpendicular to the joists. That seems to make sense in that the long edge is T&G and the 48" width should then be at a joist.

Is that the correct approach? Thanks for helping a Newbie.

Regards, Mark

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Old 02-02-2008, 01:59 PM   #2
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Basic T&G Plywood Installation


yep.


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Old 02-02-2008, 02:16 PM   #3
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Basic T&G Plywood Installation


Yea you got it right. start first row with tongue against wall. start next row with half sheet so joints are mismatched 50% (any mismatch is ok.50% best) use a scrap 2x4 at least 4' long against the grove and a sledge hammer to pound the tongue into the first row. definitely use subfloor glue. we use 2" decking staples cuz its faster but screws work too. Is this going to be a finish room? are u sure the ceiling is rated for that? If the 2x8 joist are spaning more than 10', u may need to get a pro to check it out first.
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Old 02-02-2008, 03:31 PM   #4
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Basic T&G Plywood Installation


Thanks for the good info. The attic will be for storage and yes the span on the 2X8' is good per engineers check at 8.5'. When you put the tongue against the wall do you need to trim it off with table saw or just butt against? I guess it would not matter with 5/8" sheet rock with the exception that the measured width of 48" is based on the presense of the tongue. Any tricks when you are at the other wall and putting in the last row? Do you need to leave the 2nd to last row unattached until the last row in in position?

Thanks Again

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Old 02-02-2008, 08:00 PM   #5
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Basic T&G Plywood Installation


no need to cut the togue off. rock and or base board will cover it.If you want a bug tight seal caulk the crack after rock and before baseboard. same with last piece. cut it 1/4" short accounting for the t&g . then you can pry it in tight with a flat bar against the wall plate. (assumming the walls are allready framed)

Last edited by ididit; 02-02-2008 at 08:02 PM.
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Old 02-04-2008, 10:17 PM   #6
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Roger that - I think I got it - Thanks

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