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Discussion Starter · #1 ·
Its been awhile since I framed so I'm checking to make sure what I want to do is acceptable.
I'm framing a 24'wide x 22' deep garage. I need to keep over all ht. as low as possible. Customer will drywall ceiling. Rafters will span 24' width. (4/12 gable roof).Rafters will be 2x6. Ceiling joist will be 2x12 for drywall, no center beam. Would it be a bad thing if I ran joists perpendicular to rafters, use lookouts 16oc to hold gable walls. My thoughts are if joists run with rafters the roof cut on joist would take away all my strength. If my head is in my :censored: go easy on me. Thanks in advance for your input.
 

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What's the need for 2x12 joists if its just to fasten the drywall into? Is there going to be a load placed on the 2x12?
 

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Discussion Starter · #3 ·
At first the joists were going to span 24' with no center support. I know they will drywall it sooner or later. They will probably use what ever space is available up there for storage as well.
 

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diplomat
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What's the need for 2x12 joists if its just to fasten the drywall into? Is there going to be a load placed on the 2x12?
Span tables show 2x12s are probably needed even for attics without storage. Some species and grades do it at 2x10.
 

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diplomat
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Its been awhile since I framed so I'm checking to make sure what I want to do is acceptable.
I'm framing a 24'wide x 22' deep garage. I need to keep over all ht. as low as possible. Customer will drywall ceiling. Rafters will span 24' width. (4/12 gable roof).Rafters will be 2x6. Ceiling joist will be 2x12 for drywall, no center beam. Would it be a bad thing if I ran joists perpendicular to rafters, use lookouts 16oc to hold gable walls. My thoughts are if joists run with rafters the roof cut on joist would take away all my strength. If my head is in my :censored: go easy on me. Thanks in advance for your input.
You need something to restrain rafter thrust, that's usually what ceiling joists are for. The roof cut won't take away the strength because it will be full height close to the wall, and the center span is where it needs the strength.
 

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Discussion Starter · #7 ·
You need something to restrain rafter thrust, that's usually what ceiling joists are for. The roof cut won't take away the strength because it will be full height close to the wall, and the center span is where it needs the strength.
Thanks, sorry for extra questions I just want to clear up my head. I understand what your saying about joists restrain thrust. Would'nt my collar ties help with that as well. With using 2 stiff backs (inexpensive) and look out joists hangered and toe nailed properly am I wrong. Tell me I can take it. I'm concerned about cutting away to much of the 2x12 even though it will be nailed tight to rafter.
 

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diplomat
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Collar ties are not intended to restrict rafter thrust even though they end up taking that load. Try an experiment. Build a 4' long shallow A with 2x2s and 3 nails and pull it apart by stepping on the top. Then build it as a triangle and try the same.
 

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Discussion Starter · #11 ·
Bob, Plans changed. Went from shed to gable. Material for joists onsite. I dont like the designer (young and arrogant). I wanted to move forward on monday. Not a problem, my designer/architect will be back on tues. I will get my yes or no answer then. thanks
 

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Bob, Plans changed. Went from shed to gable. Material for joists onsite. I dont like the designer (young and arrogant). I wanted to move forward on monday. Not a problem, my designer/architect will be back on tues. I will get my yes or no answer then. thanks
I hope it goes smoothly. Pretty significant change from shed to gable. Good luck with it.

- Bob
 

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Discussion Starter · #13 ·
Sorry for the too simple of a question. I left the trade in 06 and came back. I sub out framing now. This job is for a person who needs help so I am doing it myself. Just didn't want to make stupid mistake. I realize its hard to determine who is posting and what kind of work they put out. I will ask the guys who actually know me and my work. Thanks for the time anyway.
 

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diplomat
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Bob, Plans changed. Went from shed to gable. Material for joists onsite. I dont like the designer (young and arrogant). I wanted to move forward on monday. Not a problem, my designer/architect will be back on tues. I will get my yes or no answer then. thanks
That's kind of what it's all about. If you don't know, and you don't get suitable answers from others (us), then shift the liability off yourself.
 

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Renaissance Man
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Collar ties do nothing for rafter splay as they're located in the upper 1/3 of the chord. Uplift resistance is their primary function. Rafter ties however, in prescriptive code, are always on the lower 1/3 and will guard against spread if installed correctly.

With that low pitch you mention, you better have your ducks in a row or you'll be wearing a flat roof.
 

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Seems like trusses would have been the best bet for this sort of thing. Especially since it's only a 4 pitch. What kind of storage do they expect between the top of a 2x12 and the bottom of the ridge? It's less than 3'.
 
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