Attic build out. Rafters are 2×8’s-16″ oc with 9:12 pitch. Will be building wall to support one end of new ceiling joists (2×10’s spanning about 16′). Other wall they want knee wall about 5 foot high to get max. room width. Question is, can I nail the non-wall supported end of the ceiling joists to the rafters with no wall directly below?
Let’s not confuse the issue with facts!
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Why such heavy ceiling joists? Is there a floor above or storage planned?
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HI Piffin, certainly recognize the moniker. Yes they need storage in the future attic for all the stuff that's currently covering the better part of the roughly 1,200 sq. ft. of attic space they currently have. Plus need R30 atttic insulation, which means I'll have to fir down the existing 2x8 rafters in the sloped ceiling section to accept R30. Just don't know if I can support ceiling joists with only attachment to rafters. Knee wall will only be about 3-4' away from rafter/ceiling joist connection, but don't know if that will fly with the inspectors.Let's not confuse the issue with facts!
Since yopu are subject to an inspector, my two cents may be worthless.
I have done this with Three 1/2" bolts through the joint under an engineer's specs before.
I have done it with a bunch of sixteen pennies and const adhesive before.
I have done it wioth a sistered rafter section under the joint before.
Simpson may have a piece to handle this.
But the most intersting way of doing it is from one I tore apart. A guy I worked with had seen it before.
There was a 'donut' between the two pieces half drilled into each. It was about the size of a can of snuff. The socket created allowed for some movement and racking in the system without stressing the joint which was then held togeether laterally with another bolt and a few nails.
Reason i asked about loading with storage is because a 2x6 would be marginally acceptabl;e for only a ceiling and insulationm load. 2x8 would be more than enough for up to 18'3". So for a walkway and storage the 2x10 is a good, safe, choice. I might still be tempted to look at 2x8 but that depends on whatthe sporage is. Books are heavier than Christmass ornaments. But the load impacts how this joint will be made too..
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It sounds like that donut thing is called a split ring. In the old days they used to build some humongus things using them. Things like wood trusses for aircraft hangers during WWII.
I wonder if they are still available?>
I suppose a guy could do something like to take a 2" pipe to slice cuts off and then use a 2" hole saw to burrow a round slot into the framing members. The center arbor would helpline things up. The slot would only be reamed halfway into the depth of the rafter and joist faces... Hmmm......
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I think they are still available. Sometime ago I was going through one of many mag/catalogs one receives and I was suprised to see split rings for sale. If I can remember where I saw it I will give you a call. The old gray cells aint what they used to be.
last time we built timber trusses out of 4 x 10's we used split-ring connectors.. we had to buy a special bit to bore the receptors rings in the pieces.. i think the split-ring was made by temco... but that was '73..Mike Smith Rhode Island : Design / Build / Repair / Restore
Just thought of an old book I have. "Timber Design and Construction Handbook" Prepared byTimber Engineering Co.(An affiliate of the National Lumber Manufactures Association) 1956 by F.W. Dodge Corporation, New York. Library of Congress Catalog Card No. 56-10879.
There is a section on split ring construction with allowable loads etc. It's a great old book. It is somewhat out of date but it still has more info. about wood and designing with wood than any one book that I've see. I'm sure there is a more up to date edition available. I think I will google it and see what I can find. I doubt the new version what have a section on split rings.
To Google or not to google...
What the heck...
http://www.cwc.ca/products/connections/heavy_connections/split_rings.html
http://www.tpub.com/content/construction/14045/css/14045_272.htm
http://www.timberlinx.com/TLXmanual.doc
http://www.clevelandsteel.com/divisions/construction/construction.htm
.
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