×
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

standing seam metal roofing and steel roof deck

standing seam metal roofing and steel roof deck

standing seam metal roofing and steel roof deck

(OP)
Any objection to using standing seam metal roofing on wood roof trusses?

RE: standing seam metal roofing and steel roof deck

We normally don't count on that kind of metal roofing to provide adequate lateral bracing for the top chord of the truss.  Some type of sheathing, strapping, or other bracing would be required, not only for the individual trusses, but probably also for the overall lateral stability of the roof - in needing some sort of roof diaphragm to deal with the overall lateral force resisting system.

RE: standing seam metal roofing and steel roof deck

(OP)
How about a structural steel deck upon which the SSMR sits? Or timber purlins, etc.?

RE: standing seam metal roofing and steel roof deck

Yes, we've placed SSMD over a steel metal deck before.  I think our architects placed a plywood sheathing over the deck to provide some sort of surface to use for attachment of the roofing deck.  Some insulation was in the section somewhere as well.

RE: standing seam metal roofing and steel roof deck

(OP)
Thanks, JAE!

I was sent on a near-wild goose chase regarding the exclusive use of plywood roof sheathing on wood trusses. My understanding is that, sure, plywood is the most common BUT there's nothing the available literature (MBMA Roofing Manual, et al) prohibiting the use of metal decking on wood trusses.

RE: standing seam metal roofing and steel roof deck

It seems as though the difficult part of attaching any metal deck to wood trusses would be finding a suitable attachment and diaphragm shear values for that attachment.

RE: standing seam metal roofing and steel roof deck

(OP)
I agree - but that doesn't mean it's not prohibited.

RE: standing seam metal roofing and steel roof deck

I agree with azcats the attachment of the wood to the deck is the difficult problem.  There are a lot of designers who have little experience in wood design, who probably avoid the problem.  When you attach metal to wood the fastener strength is almost always controlled by the wood.

Another part of the problem is that you have two different trades installing the products.  If you use wood decking, the
glulam installer, generally would also install the deck.

I am involved in 20 to 30 projects a year which use glulams with deck.  I see maybe one project a year which uses metal deck.  

I agree with JAE that standing seam roofing is not adequate to laterally brace the trusses and the building.

RE: standing seam metal roofing and steel roof deck

(OP)
Good points. In any case, I would require pernament lateral bracing for the trusses - and the SSMR/metal deck wouldn't count.

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