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FW: Ceiling joists/rafter ties IRC R802.3.1

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Title: FW: Ceiling joists/rafter ties IRC R802.3.1

If it is a hip-beam system, there is no thrust... So it only needs to be tied together to resist out-of-plane wind loads... Analogous to a ridge beam system.

If it is a hip rafter system (conventional construction), it needs to be tied together in both directions because the hip rafter is just a connection point... Analogous to a ridge board system.



John "Buddy" Showalter, P.E.
Director, Technical Media
AF&PA/American Wood Council
1111 19th Street, NW, Suite 800
Washington, DC 20036
P: 202-463-2769
F: 202-463-2791

The American Wood Council (AWC) is the wood products division of the American Forest & Paper Association (AF&PA). AWC develops internationally recognized standards for wood design and construction. Its efforts with building codes and standards, engineering and research, and technology transfer ensure proper application for engineered and traditional wood products.

The guidance provided herein is not a formal interpretation of any AF&PA standard.  Interpretations of AF&PA standards are only available through a formal process outlined in AF&PA's standards development procedures.


> From: Jim Wilson <wilsonengineers(--nospam--at)>
> Subject: Ceiling joists/rafter ties IRC R802.3.1
> To: seaint(--nospam--at)
> IRC R802.3.1 Ceiling Joist and rafter connections:
> "Where ceiling joists are not parallel to rafters, subflooring or
> metal straps attached to the ends of the rafters shall be installed in
> a manner to provide a continuous tie across the building, or rafters
> shall be tied to 1-inch by 4-inch minimum-size crossties."
> Does this apply to the secondary direction in a
> hip-framed roof? Some inspectors insist so, some
> don't know, some don't know that they don't know.
> I've never seen it applied this way in the field, but
> one prominent local builder has been specifying
> two-way ties on their hip-roof structures. I would
> like to either back them up, or save them the effort
> and the consumer the added cost and inconvenience.
> Thanks in advance.
> Jim Wilson, PE
> Stroudsburg, PA