Installation Guide

ENGINEERED WOOD CONSTRUCTION GUIDE
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FORM NO. E30V
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© 2011 APA – THE ENGINEERED WOOD ASSOCIATION
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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