Hello. I would like to get some input on how you guys would do this.
If you have a room that is 30′ long by 20′ wide and your rafters span the 30′, how would you run your joists if there are no walls midspand to support them?
Thanks
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Replies
No walls at mid-span, you mean?
J. D. Reynolds
Home Improvements
Yes, no walls at mid span.
Still trying to learn all the terms.
Thanks.
Edited 2/15/2008 11:50 am ET by blownonfuel
Probably steel bar joist.
Spheramid Enterprises Architectural Woodworks
"Success is not spontaneous combustion, you have to set yourself on Fire"
you need an engineer to give you specs for a steel I beam.
you can cut the 30' in half with the ibeam, then run 1x10's on 16" centers
Regards,
Roger
You probably meant to say 2x10.
Sounds like you're saying that you have a 30' rafter span with a 30' open room and your running ceiling joists that are 30' long. Is this correct? If so, you put a microlam header spanning 20' and run your ceiling joists into the microlam with joist hangers.
Exactly Joe. Thanks for your help. I'm still wondering why the guy who framed the house did it the way he did. Actually I do know why he did it but that's another story for another day. I'll post some pics of how he did it later so you guys can take a look.
Thanks Again.
So this was something that was done already? If he did it the way I described, I hope he posted underneath each end of the microlams down to the foundation, or if there were any openings, he had headers big enough to support the microlams.
Joe Carola
just run trusses, call bosshog.two ways to screw up concrete 1) concrete driver 2) concrete finisher
Like BB said, standard practice is wood trusses.
Light weight, strong, inexpensive, simple engineering, any pitch and overhang/soffit you'd like, easy installation.
Edited 2/15/2008 6:50 pm by Hudson Valley Carpenter
Hello Joe. I'm not sure if you read my other post a few weeks back but I had asked why one would run joists perpendicular to the common rafters.I want to add on to my house and was looking at the framing of the roof and noticed the joists ran parallel to the hip of the roof and I could not figure out why he did it this way. Well now I know. In order to span the living room area he ran joists parallel to the 20' width of the room instead of doing a beam and attaching the joists to the beam. Did he do it this way to pocket more money? He skipped out on the job and left with some of the money that was supposed to go to the house. Anyway I posted some pics. online if you would like to take a look. The pics are of one end of the house and the joists are running parallel to the 20' width of the room.http://picasaweb.google.com/blownonfuel/Framing
I want to add on to my house and was looking at the framing of the roof and noticed the joists ran parallel to the hip of the roof and I could not figure out why he did it this way.
Every hip roof whether the ceiling joists are running parallel to the main commons or not will have two side where the ceiling joists will be running perpendicular to the rafters.
At that point I double up the ceiling joists back enough so they clear the hip and then cut small 2' or 3' outrigger ceiling joists nailed to the doubles with joist hangers and nailed to the top plate and along side the rafters.
Since your roof is a stick framed hip roof, run the ceiling joists the 20' way as Jim said and double up at the ends and nail small outrigger joists to the doubles with hangers. On top of the ceiling joists you also run strongbacks the whole 30' length tieing everything in.
Joe Carola
Hello Joe. I was reading a book by Larry Haun and he shows doing a hip roof with all the joist running parallel with the common joists. Now he does show a few different methods of Stub-Joist or Heading Out The Joists or Strongbacking. Is this what you are referring to? Would it not be easier to just run all the joists parallel to the common rafters?What about ending the joists at the side king common rafter, double that last joist then hang the the hip side joist off of the last double joist? That way the hip joists span the 20' and then come back and tie the jack rafters with rafter ties?Now that I think about it, the way Larry Haun shows the framing for the hip you would have to have a span less than what the max length of the joist can be. Or you must have a wall midspan in order to run the joists parallel to the common rafters thru the whole length of the roof.Am I making any sense here?
I'd run them the 20 way and clearspan them.
Bob's next test date: 12/10/07