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Unread 12-16-2014, 11:53 PM   #1
porridge8712
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Best course of action for unlevel floor

Been putting this job off until I can get some answers, I figured you guys were the best people to ask. I have a townhome, built in '87. We moved in, toilet didn't work. After a plumber who was about as useful as biddies on a bull, I pulled the toilet to discover that the wax ring had crapped out, and water had been leaking for god knows how long, mold under vinyl/luan/down to sub. Tore everything down to joists, now I'm faced with a new problem.

The width of the room is 4' and some change, from one end to the other, across 3 (2x8) joists, there is a slope of about 1/2' to the other side. Joists also cross a girder right at the threshold of my bathroom. Floor was nom 5/8 OSB, want to put down 3/4 T&G Ply. I know my tiles only care if the floor is flat, but by god I care if it's level.

Best course of action?

So far I have:

A. Rip a long shim to span the length the joists, sand and plane to level.

B. Sister 2x8's to the lower offensive joists

C. Lay down sub anyways and lay a deck mud bed over it. I'm unsure how thin I can lay the mud, I would rather not have a huge step from my bedroom to the bath, since I'm planning on using Ditra.

I like B more than A, but I'd rather get all y'all's opinion first. Thanks!
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Unread 12-17-2014, 01:16 AM   #2
Kman
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If you're planning on replacing the subfloor anyway, I would go with option B. It would solve your leveling problem, and could possibly help any excessive joist deflection. Do you know what the span is on those 2x8's?
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Unread 12-17-2014, 10:15 AM   #3
porridge8712
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Span is 8.5'. As far as sistering, would 2 5" carriage bolts every 2' work alright with plp in between joist and sister?
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Unread 12-17-2014, 10:44 AM   #4
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Welocme, Brian.

You understand that the span Kevin is asking for is the unsupported span of the joists and not the span of the room, yes?

Not sure what "plp" might refer to.

That bolt schedule would not be nearly enough to suit my taste. I generally sister using 2 1/2" to 3" decking screws and construction adhesive. Angled fastener rows of three screws would be 12" to 16" apart. My current favorite adhesive for the application is Loctite's PL Premium.

My opinion; worth price charged.
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Unread 12-17-2014, 11:36 AM   #5
porridge8712
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Yes, I do. The bathroom is directly above my equally small kitchen that has load bearing walls at each end.

PLP = PL Premium.

Duly noted, screws it is. Thanks for all you help. Any other questions I know where to come!
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Unread 12-17-2014, 12:06 PM   #6
cx
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The wide spacing and sparse numbers of your bolts just won't provide adequate clamping for your construction adhesive and would allow for more creep than closer spaced fasteners and good clamping for the adhesive.

While I no longer see a clamping pressure requirement in their instructions, I know there was such a requirement in past (before it became a Loctite product) and I've always tried to clamp my installations well. Dampening one side of the assembly before gluing can help, too.

So, some of my recommendations are governed by my warranty information posted below.

My opinion; worth price charged.
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