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Hip Roofs and Parallel to Ridge

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That’s what we do in the Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings (which is referenced in the IRC). See WFCM Table 2.5B, footnote 4.






John "Buddy" Showalter, P.E.
Director, Technical Media


American Wood Council

1111 19th Street, NW, Suite 800
Washington, DC 20036

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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: Richard Calvert <RichardC(--nospam--at)>

To: "seaint(--nospam--at)" <seaint(--nospam--at)>

Subject: Hip Roofs and Parallel to Ridge


We're having something of an in-house debate:

From a logical stance, a hip roof does not present the abrupt change in dir=

ection that a gable loaded parallel to wind does; and is, rather, more of t=

he same flow pattern as one would see in a perpendicular to ridge loading. =

 For this reason it would seem that perpendicular to ridge, regardless of w=

ind direction, would be appropriate for a hip roof.  But nothing in the cod=

e or commentary appears to substantiate this thought process (that we can f=

ind at least).

What say you?


Richard Calvert, EIT

Project Engineer


Lindemann Bentzon Bojack

Architects & Engineers

290 Citrus Tower Blvd, Suite 200, Clermont, Fl. 34711

tel: 352.242.0100 ext.141 fax: 352.242.0302<>


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