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Re: Attic rafter sistering
[Re: TurkeyJoe]
#4105750
03/23/24 03:05 PM
03/23/24 03:05 PM
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Joined: Dec 2013
Posts: 22,699 Lickskillet, AL
Irishguy
a.k.a. Dingle Johnson
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a.k.a. Dingle Johnson
Joined: Dec 2013
Posts: 22,699
Lickskillet, AL
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I would nail the boards on instead of screwing them. Screws do not have any ductility, so I personally wouldn’t use them for that application. Joe is right. Nails have a higher shear capacity than a screw of the same relative size, but screws have a higher pull out value. Screws are usually harder than nails and therefore more brittle.
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Re: Attic rafter sistering
[Re: ford150man]
#4105752
03/23/24 03:09 PM
03/23/24 03:09 PM
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Joined: Jun 2015
Posts: 14,022 Some Marriott/Auburn
AU7MM08
OP
Booner
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OP
Booner
Joined: Jun 2015
Posts: 14,022
Some Marriott/Auburn
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Make sure you drill a hole at the very end of the crack to prevent it from running, before you scab it. Makes sense on drilling a hole
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Re: Attic rafter sistering
[Re: AU7MM08]
#4105759
03/23/24 03:25 PM
03/23/24 03:25 PM
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Joined: Jun 2015
Posts: 14,022 Some Marriott/Auburn
AU7MM08
OP
Booner
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OP
Booner
Joined: Jun 2015
Posts: 14,022
Some Marriott/Auburn
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Picked up this box this afternoon from Russel Do It Center and going to slather up the two boards with Loctite PL Premium Should work well. Glad to be doing this project in March rather than August
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Re: Attic rafter sistering
[Re: AU7MM08]
#4105773
03/23/24 04:11 PM
03/23/24 04:11 PM
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Joined: Dec 2013
Posts: 22,699 Lickskillet, AL
Irishguy
a.k.a. Dingle Johnson
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a.k.a. Dingle Johnson
Joined: Dec 2013
Posts: 22,699
Lickskillet, AL
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I might consider predrilling 1/4" holes in the scab boards to keep them from splitting. 5/16" is a big screw. I know that virtually no one trusts glue and always wants to glue and screw, but I had an old wooden boat builder with years and years of experience tell me one time: "If glue won't hold it a screw damned sure won't hold it." If anything a screw should be placed in there to pull the wood together and hold it until the glue dries. Think of it this way... Once the glue dries, the glue is providing shear resistance across the whole faying surface. Screws are only providing shear resistance across the shaft of the screw. When a laminate traditional bow is made or a laminate wood beam is made, there are no screws... Only glue. Glue is badass. Screws... Meh... So either screws or glue, but you really don't need both. Like I said each one of those screws will provide about 400 pounds of shear resistance. So 4 of them on each side of the crack would be more than enough. If I was fixing that, I would cut 2 pieces of 3/4" plywood the same depth of the rafter and make them long enough to extend 12" on each side of the crack, dampen both surfaces, then glued the chit out of both surfaces with Titebond III, clamp them on each side, let dry, take the clamps off and go have a beer.
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Re: Attic rafter sistering
[Re: AU7MM08]
#4105781
03/23/24 04:35 PM
03/23/24 04:35 PM
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Joined: Mar 2012
Posts: 3,307 Here
Okatuppa
10 point
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10 point
Joined: Mar 2012
Posts: 3,307
Here
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Just wrap it with duct tape and add a couple zip ties.
I ain't fightin nobody that swings around in trees with a running chainsaw like Tarzan. - FurFlyin
Oh I just thought u were a dumba$$ 🤣 my apologies… - jb20
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Re: Attic rafter sistering
[Re: AU7MM08]
#4105783
03/23/24 04:41 PM
03/23/24 04:41 PM
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Joined: Jul 2011
Posts: 34,456 Boxes Cove
2Dogs
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 34,456
Boxes Cove
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If you use a GOOD glue and plenty of it , you can take the screws or nails out and throw them away after it cures.
"Why do you ask"?
Always vote the slowest path to socialism.
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Re: Attic rafter sistering
[Re: AU7MM08]
#4105793
03/23/24 05:24 PM
03/23/24 05:24 PM
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Joined: Apr 2017
Posts: 15,358 Ourtown, AL
BCLC
Old Mossy Horns
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Old Mossy Horns
Joined: Apr 2017
Posts: 15,358
Ourtown, AL
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2 pipe clamps and a truck antenna is all you need
We’re not dead. We just smell that way. Dayum. - AC870
Yessir! I’m always gonna shoot what makes me happy and I want everyone else to do the same! If you shoot one be proud of it and don’t worry what anyone else thinks. - SJ22
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Re: Attic rafter sistering
[Re: BCLC]
#4105851
03/23/24 07:58 PM
03/23/24 07:58 PM
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Joined: Dec 2013
Posts: 22,699 Lickskillet, AL
Irishguy
a.k.a. Dingle Johnson
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a.k.a. Dingle Johnson
Joined: Dec 2013
Posts: 22,699
Lickskillet, AL
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2 pipe clamps and a truck antenna is all you need What are you going to use to whip somebody's ass then?
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Re: Attic rafter sistering
[Re: AU7MM08]
#4106006
03/24/24 07:39 AM
03/24/24 07:39 AM
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Joined: Jul 2011
Posts: 34,456 Boxes Cove
2Dogs
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 34,456
Boxes Cove
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You might also kick off a brace up to the rafter from the joist under it . It may have been a cracked or damaged piece of wood when nailed up and just split more. Unless it's opened up really big and sagging , it may not be as bad as it looks . Prolly not a big deal , easy little fix.
"Why do you ask"?
Always vote the slowest path to socialism.
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Re: Attic rafter sistering
[Re: Lonster]
#4106058
03/24/24 09:35 AM
03/24/24 09:35 AM
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Joined: Jun 2015
Posts: 14,022 Some Marriott/Auburn
AU7MM08
OP
Booner
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OP
Booner
Joined: Jun 2015
Posts: 14,022
Some Marriott/Auburn
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How did you discover this attic rafter with a crack in it? Putting decorations in the attic, I’ve known about it for a while just been lazy on getting it fixed. It’s a fairly small crack so I wasn’t super concerned
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Re: Attic rafter sistering
[Re: imadeerhntr]
#4106060
03/24/24 09:43 AM
03/24/24 09:43 AM
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Joined: Feb 2007
Posts: 18,939 colbert county
cartervj
Old Mossy Horns
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Old Mossy Horns
Joined: Feb 2007
Posts: 18,939
colbert county
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On a different note I watched an old carpenter craftsman build a 16” x40’ structural beam many years ago out of plywood glued and nail gunned together about 8” thick. I was amazed at the time. Didn’t realize glue lam beams would become a common thing Back in the 80s we bolted steel plates between 2x10s to get a 40 ft span for a second story balcony
“Socialism only works in two places: Heaven where they don't need it and hell where they already have it.” ― Ronald Reagan
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Re: Attic rafter sistering
[Re: AU7MM08]
#4106204
03/24/24 04:42 PM
03/24/24 04:42 PM
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Joined: Jun 2015
Posts: 14,022 Some Marriott/Auburn
AU7MM08
OP
Booner
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OP
Booner
Joined: Jun 2015
Posts: 14,022
Some Marriott/Auburn
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Used 8 of those 4” screws, right as I completed driving the last one the tip snapped off the included T30 bit. Ended up driving 2 extra 3” deck screws. Went very liberal with the PL Premium. Should be a good enough fix, worse case that rafter ends up getting replaced but I doubt that will be necessary.
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