×
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

Wood Truss spacing

Wood Truss spacing

Wood Truss spacing

(OP)
I am desiging a chalet to be built in Pigeon Forge, TN with an "A" frame roof truss built out of heavy members. Building width is 26'. Roof deck is 2x T&G on top of the top chord. What is the maximum truss spacing and minimum member size?

RE: Wood Truss spacing

Ray
You did not specify the wood species, so i assumed SYP.
The T&G pine commercial Sy=1400 psi
Typical spacing typically is 32" or 36", with deflection and creep the design drivers.
Design the Rafters – 20 psf live load, 10 psf dead load, 240 deflection, CD = 1.15 no drywall
Cheers

RE: Wood Truss spacing

I want to span 17 feet accross a garage to support a loft.  The loft will have a conventional floor system supported by a tie in to an existing wall and a beam.  For the beam I am thinking that two two by twelves with a plywood flitch plate secured between them would be sufficient.  Is that true?  Alternatively, I was thinking I might get either one or two(if needed) Plywood Trusses ( Ones with a two by four slotted into plywood web on both the top and bottom).  Minimizing the overall height of the beam is desirable.  Do you have any suggestions about this problem and what to use to minimize the height of the beam.  Thanks, Grandbuddy

RE: Wood Truss spacing

Grandbuddy,
Usually it is helpfull to post new questions on there own.

What area loads the beam?
Will the roof load up or pass any load to the beam?
Is the an adequate foundation to support the beam loading?

You did not specify the wood species, so i assume SYP.
For SYP beams 17' long usually 2-2x12s deflection is too much.
Use 30 psf live load, 10 psf dead load, 360/L deflection for Sleeping Rooms and Attic Floors

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