×
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

Purlin trusses at 96" o/c OR TCBrg trusses at 32" o/c

Purlin trusses at 96" o/c OR TCBrg trusses at 32" o/c

Purlin trusses at 96" o/c OR TCBrg trusses at 32" o/c

(OP)
Most of the industrial and big box buildings going up are using wood or steel purlin trusses spaced 96" o/c.

An argument can be made for a top chord bearing 2x4 truss system spaced 32" o/c is more economical. Considering the HW hangers and 2x4 stiffeners are eliminated. Most framers prefer the 32" o/c option, thus labor should be cheaper. And most if not all truss fabricators can provide a 32" o/c system where the 96" o/c system is significantly limited to fabricators who specialize in purlin trusses and therefore can gouge their prices.

I don't see the advantages to using a panelized system over a 32" o/c system or even 24" o/c. The trades should be able to work with both.

What am I missing ? What are the structural advantages with a panelized roof versus 32" or 24" o/c ?

Thanks

RE: Purlin trusses at 96" o/c OR TCBrg trusses at 32" o/c

By panelized system, do you mean the roof decking material is a panelized system?  If so, I think there are insulated panels that are much more energy efficient than conventional type sheathing.

RE: Purlin trusses at 96" o/c OR TCBrg trusses at 32" o/c

I assume you are talking about a Berkley Panel system with 2X4 or 2X6 members nailed to 7/16" or 1/2" CDX plywood at 24" OC.  I am not a contractor, but it has always been my impression that elements manufactured (assembled in this case)in the field are more expensive and more controlled than those plant manufactured.  The more pieces and handling in the field, the more the cost.

Mike McCann
McCann Engineering

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