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Old 02-15-2009, 12:11 PM   #1
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Finishing my upstairs attic<--Help!


Hey guys,

I am going to be finishing the upstairs of my cap cod in northeast Ohio. I have pulled up all of the retro 70's carpet that was here when I bought the house. The photos show a mismatch of plywood that was installed as a subfloor. I am wondering should I rip up all of the pre-existing subfloor and lay down new plywood?? The depths range from 1/4 to 3/4, currently. If I do need to rip out and put in new, what depth should I install over the floor joists? I would like to install a bathroom upstairs, so eventually I would be putting in a tub/shower, along with tile.

Can anyone point me in the right direction?

Thanks!
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Old 02-15-2009, 12:21 PM   #2
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Finishing my upstairs attic<--Help!


if it is uneven, rip it out. Then use 3/4" T& G plywood. For the tile area you will need to add one more 1/2" plwood

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Old 02-15-2009, 01:13 PM   #3
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Finishing my upstairs attic<--Help!


what size are the floor joists? 2X10's 16" OC ?

and be careful ripping out the old plywood. Pull out every nail or screw or you could damage the floor joist. PIA I know. probably wont be too many and if your floor joists are strong enough then like mentioned above, 3/4 T&G screwed down with construction adhesive.
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Old 02-15-2009, 02:33 PM   #4
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Finishing my upstairs attic<--Help!


Quote:
Originally Posted by II Weeks View Post
what size are the floor joists? 2X10's 16" OC ?

and be careful ripping out the old plywood. Pull out every nail or screw or you could damage the floor joist. PIA I know. probably wont be too many and if your floor joists are strong enough then like mentioned above, 3/4 T&G screwed down with construction adhesive.
An attic with 2 X 10... that would be one strong ceiling. These are normally 2 X 6 at best they can hope for 2 X 8. Which means he should also sister new joists so they become 2 X 10. But also we need to know what bearing walls are supporting this attic area. What spans are above any bearing walls.
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Old 02-15-2009, 03:03 PM   #5
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Finishing my upstairs attic<--Help!


Before you close up the floor with all that plywood, make sure you have planned out the wiring and plumbing. If necessary ,plan on a subpanel up there and run the main line from the panel in the basement to the place upstairs the subpanel will be.
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Old 02-15-2009, 03:34 PM   #6
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Finishing my upstairs attic<--Help!


Why a sub panel for two circuits. I would run a 12/3 to a junction box.
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Old 02-15-2009, 05:12 PM   #7
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Finishing my upstairs attic<--Help!


I was figuring, Bath(1 or 2 circuits right there), lighting, outlets, maybe an A/C or two. A subpanel is cheap insurance to unanticipated expansion.
Ron

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