×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

light wood roof trusses

light wood roof trusses

light wood roof trusses

(OP)
We are planning a frame building 61 ft x 66 ft using light wood trusses .... cottage roof ..4/12 pitch. Anyone know of some sketches on the net for ideas on on appropriate location of girder trusses. We need to identify point loads for foundation design.

RE: light wood roof trusses

If you are dealing with a hip roof, anywhere from 8 feet in for residential, to 16 feet in for commercial and longer spans, depending on how it affects the economy of the truss design.

If you are dealing with a Dutch hip, then the girder truss is at the face of the dutch hip.

If you know the truss company to be used, they should not only be abletter idea than e to give you a better idea than I, they should be able to provide you with a layout and the reactions.   

Mike McCann
MMC Engineering

RE: light wood roof trusses

The girder setback will likely be 8' +/- a couple of inches.

If you need to get started, just specify an approximate girder setback in your plans.  Certain suppliers like certain dimensions (my old company used 7'10 1/2") in order to make the drywall work out evenly.  It's not set in stone.  

Alternatley, you could just design your footing for 12-18" of load eccentricity and give your truss supplier a 2' window to work with.  This would cost you next to nothing as far as the footing goes.

RE: light wood roof trusses

Assuming a hip roof you would probably be safe with an 8' setback, but without seeing the plans or knowing the loading it is only a guess. If you increase the setback to 10'-16', truss reactions can get very large, not to mention truss to truss hanger costs.
  
Component Runner, LLC is a design outsourcing company that specializes in wall panel and truss design services using MiTek software. If you would like to learn more, check out our website.

We can run some preliminary designs with girder locations and reactions if you provide the roof loading and location of the building.

Chip Dean
www.ComponentRunner.com

RE: light wood roof trusses

This varies from truss company to truss company. We always used 10 foot setback unless it was a dutch hip.

RE: light wood roof trusses

We always set the girder truss dimension and expect them to adhere to it.  No problems.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources