×
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

Minimum Roof Sheathing Thickness

Minimum Roof Sheathing Thickness

Minimum Roof Sheathing Thickness

(OP)
I have a question about the minimum thickness of roof sheathing, and please bear with me, I am self taught on wood design. With reference to the attached tables, it appears as though IBC 2015 limits roof sheathing to 5/8". However, the NDS Supplement diaphragm shear tables only give values up to 19/32" thick? What am I missing? If IBC limits roof sheathing thickness to 5/8", shouldn't the NDS Supplement table start at 5/8" and go up from there (i.e. who cares what the diaphragm shear capacity of 3/8" sheathing if you aren't allowed to use it per IBC)?

RE: Minimum Roof Sheathing Thickness

That table is for decks (lumber). The bottom of that page has a table for plywood.

RE: Minimum Roof Sheathing Thickness

7/16" is the minimum here.

Mike McCann, PE, SE (WA)


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