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08-31-2009, 09:21 PM
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#16
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the Musigician
Join Date: Jul 2008
Location: I'm right here!
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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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08-31-2009, 09:23 PM
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#17
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the Musigician
Join Date: Jul 2008
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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...
DM
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08-31-2009, 09:28 PM
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#18
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the Musigician
Join Date: Jul 2008
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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.
DM
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09-01-2009, 12:11 AM
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#19
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Member
Join Date: Apr 2008
Location: NJ
Posts: 406
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Again with the sister joists . . .
Quote:
Originally Posted by GBR in WA
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; 09-01-2009 at 12:15 AM.
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09-01-2009, 12:15 AM
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#20
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Member
Join Date: Apr 2008
Location: NJ
Posts: 406
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Again with the sister joists . . .
Quote:
Originally Posted by DangerMouse
"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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Correct. No floor tile, but I have 12" marble tiles installed in the shower.
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09-01-2009, 11:39 AM
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#21
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Moderator
Join Date: Mar 2009
Posts: 8,789
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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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10-07-2009, 12:18 PM
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#22
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Member
Join Date: Apr 2008
Location: NJ
Posts: 406
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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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10-07-2009, 02:26 PM
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#23
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Moderator
Join Date: Mar 2009
Posts: 8,789
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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
__________________
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!
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10-07-2009, 05:59 PM
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#24
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Member
Join Date: Apr 2008
Location: NJ
Posts: 406
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Again with the sister joists . . .
Quote:
Originally Posted by GBR in WA
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 08:25 PM.
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