Long span systems – Georgia-Pacific APA Engineered Wood Construction Guide - Roofs User Manual

Page 8

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ENGINEERED WOOD CONSTRUCTION GUIDE

FORM NO. E30V

© 2011 APA – THE ENGINEERED WOOD ASSOCIATION

WWW.APAWOOD.ORG

65

Roof Construction

Long Span Systems

Both preframed panel systems and
direct application of sheathing to
secondary or primary framing are
common approaches in long span roof
construction. Bay spacing and type of
framing govern the choice.

Experience shows that panels over
supports 48 inches on center often
yield maximum economy. Panels with
a Span Rating of 48/24 are good for at
least 35 psf snow load and meet the
require ments for most guaranteed or
warranted roofs. Panels are assumed
continuous over two spans with long dimension or strength axis across supports.

Figure 24 illustrates typical connections for engineered flat roof members.

Wood flange

Wood structural

panel web

Wood chord

Diagonal wood web

Metal truss plate

Panels Nailed to Nailer
Bolted to Steel Joist

Panels Nailed to Glulam Beam

APA panel deck

Common nails
Wood nailer*

Bar joist web

APA panel deck

Glulam beam

*May be installed

across joists (good

for nonmodular

joist spacing).

Carriage bolt

or lag screw
Bar joist flange

APA panel deck

APA panel deck

Panels Nailed to Wood I-Joist

Panels Nailed to Open-Web
Parallel-Chord Wood Truss

FIGURE 24

TYPICAL CONNECTIONS TO ENGINEERED FLAT ROOF MEMBERS

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