×
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

2009 IRC - ICF Wall Construction

2009 IRC - ICF Wall Construction

2009 IRC - ICF Wall Construction

(OP)
Figure R611.9(9) shows a roof truss fastened to the top of an ICF wall. The detail requires tension ties, roof boundary nailing and other stuff well in excess of what they require for a truss on top of a wood framed wall. Why the difference? I called our state code officials and they have no idea why.
FWIW, we are exempt from seismic design for residential structures in NC.

Thanks in advance.

RE: 2009 IRC - ICF Wall Construction

Because it is concrete wall and wood roof. Same as masonry wall to wood roof. Makes no difference whether seismic or non-seismic.

I would not feel comfortable living in a concrete-walled structure in a hurricane region knowing there is not good connx between roof and walls.

RE: 2009 IRC - ICF Wall Construction

(OP)
Are you worried about the wall falling on you? It seems less likely to fall as it has some cantilever effect from the footing and the ability to span horizontally better than a wood wall.

RE: 2009 IRC - ICF Wall Construction

OK, be that way. At least provide the equivalent of H2.5 tie at each roof truss.

RE: 2009 IRC - ICF Wall Construction

Isn't NC hurricane and tornado-prone? I don't understand why IRC.

RE: 2009 IRC - ICF Wall Construction

I've been doing ICF for a few years now. Calc your out of plane wall seismic force (and wind force) and design your tension tie to transfer this into the roof diaphragm. Really isn't too much different than wood requirements, only concrete ways more :)

RE: 2009 IRC - ICF Wall Construction

Minimum boundary nailing is 8d @ 6" oc, so you need at least that anyway. I just don't use the word boundary to construction types - they prefer the word "edge"...of course that doesn't define exactly what we engrs are referring to.

RE: 2009 IRC - ICF Wall Construction

(OP)
IRC does not require boundary nailing on wood structures AFAIK. They only require blocking between the trusses or rafters when the depth exceeds a certain amount. No blocking = no boundary nailing.
So back to my original question, "why would ICF construction be any different?"

RE: 2009 IRC - ICF Wall Construction

IRC doesn't require boundary nailing?

Then how do you nail the perimeter of the roof deck?

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