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Old 08-31-2009, 08:21 PM   #16
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Again with the sister joists . . .


"The main purpose of these sisters is to give the floor sufficient rigidity for marble floor tile."
i would think no, not yet....

DM

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Old 08-31-2009, 08:23 PM   #17
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Again with the sister joists . . .


"Do you think that would do have an impact on my masonry shower pan and marble shower?"
but this is...

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Old 08-31-2009, 08:28 PM   #18
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Again with the sister joists . . .


looks to me like he's taking out t&g on one side of the orange clamp and putting down ply.
no need really to try to jack anything up imho though, he just needs to add lateral strength to existing joists.
12"x12" tiles need a pretty solid surface, or crack they shall.

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Old 08-31-2009, 11:11 PM   #19
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Again with the sister joists . . .


Quote:
Originally Posted by GBR in WA View Post
Cut the joist 6" longer than outside-outside bearing. With more than code for waste hanging over, -- inches past bearing of size depth of joist = 2x10 = 10" max. past bearing.
Cut 3/4" x 12" rip off each end's bottom edge, roll the joist into position, install wedge cut-back under same ends, use a wood (ply or similar)driver to push joist up tight to take the load. Remember the saw cut thickness, the end will need to go past flush of joist end. This is a much gentler and safer way to get the exact load needed (fine-tune). Code allows 1/4 of size of joist removed, but don't go anywhere near that.

Other possible help: http://www.finehomebuilding.com/PDF/Free/021184090.pdf

Be safe, G
I think I understood you except for the wedge thing. Youre talking about a |\ approach instead of a |/ approach.

Last edited by benjamincall; 08-31-2009 at 11:15 PM.
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Old 08-31-2009, 11:15 PM   #20
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Again with the sister joists . . .


Quote:
Originally Posted by DangerMouse View Post
"The main purpose of these sisters is to give the floor sufficient rigidity for marble floor tile."
i would think no, not yet....

DM
Correct. No floor tile, but I have 12" marble tiles installed in the shower.
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Old 09-01-2009, 10:39 AM   #21
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Again with the sister joists . . .


Cut a wedge out of the bottom of the same joist to be installed. One from each end. Crown a joist, measure 12" out, mark that, on the bottom edge. Measure, on the end of joist, 3/4" up from bottom, mark that. Cut from mark to mark, that is your wedge. Install the joist, cuts side down, over bearing. Tip into place, very easy with the wedge missing from over each bearing. Install wedges with glue till joist takes the load, nail joists together, or bolt.
Be safe, G
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Old 10-07-2009, 11:18 AM   #22
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Again with the sister joists . . .


How much of the corner can I cut before I'm in trouble? I tried 3/4", but I'm now down to about 3/8" left of wood in contact with the bearing surface? Have I cut too much?
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Old 10-07-2009, 01:26 PM   #23
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Again with the sister joists . . .


You can remove 1/4 of the joist size over bearing on the ends. With a2x8, you can remove 1-7/8" at bearing ends only, from the bottom of the joist. You should still have 5-5/8" of joist above the bearings on the ends. This will give you the strength of the full 2x8 joist. Drill a hole as in the right-hand picture on step #2. Compare at chart on page #31 here: http://books.google.com/books?id=iwS...num=3#PPA32,M1
Be safe, Gary
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Old 10-07-2009, 04:59 PM   #24
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Again with the sister joists . . .


Quote:
Originally Posted by GBR in WA View Post
You can remove 1/4 of the joist size over bearing on the ends. With a2x8, you can remove 1-7/8" at bearing ends only, from the bottom of the joist. You should still have 5-5/8" of joist above the bearings on the ends. This will give you the strength of the full 2x8 joist. Drill a hole as in the right-hand picture on step #2. Compare at chart on page #31 here: http://books.google.com/books?id=iwS...num=3#PPA32,M1
Be safe, Gary
Thanks, Gary. I don't seem to have violated guideline. I took a circular saw and shaved off one corner of the joist at 45 for a 15-inch length at one end (10 inches at the other), tapering the 1-1/2" dimension down to 3/8" where it will make contact with the bearing surface.


Last edited by benjamincall; 10-10-2009 at 07:25 PM.
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