×
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

Support-width factor for plywood

Support-width factor for plywood

Support-width factor for plywood

(OP)
Hello All,

I find that the American Plywood Association specifies a support-width factor, equal to 0.25 inch for two-inch nominal lumber framing and 0.625 inch for four-inch nominal lumber framing. I have six-inch nominal lumber framing. Any ideas what support-width factor I should be using?

Thanks!

EIT

RE: Support-width factor for plywood

The support-width factor takes into account that wider supports reduce the clear span. For example, a nominal (center to center) 24" span would have a clear span of 22 1/2" with 2X supports, but a 20 1/2" clear span with 4X supports. In theory, a plywood panel with wider supports is stronger in bending. But, with plywood there are too many other factors that influence strength. 6X supports should be better than either 2X or 4X... but other factors may govern.

The APA tables assume 2X supports for spans less than 48" and 4X supports for spans of 48", or greater. IMHO, for 6X supports just go with the published values.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

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