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4x framing required for plywood roof panels spanning 48"?

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We have been reviewing the UBC and APA report 138. We cannot seem to find any literature on this subject, so I thought I would ask:

Roof Diaphragm Framing: 2x top and bottom chord on truss member.
Truss spacing: 48" o.c.
Plywood: 48/24 span rating, structural 1, 7/8"

Are 2x framing members permitted for framing spaced at 48" o.c.? 

Gina T. Gobo, EIT
Carter & Burgess, Inc
Facilities - Structural Engineering
Seattle, WA
Ph. 425-822-7096
Fax 425-822-7246
gobogt(--nospam--at)c-b.com
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<DIV>We have been reviewing the UBC and&nbsp;APA report 138. We cannot seem to 
find any literature on this subject, so I thought I would ask:</DIV>
<DIV>&nbsp;</DIV>
<DIV>Roof Diaphragm Framing: 2x top and bottom chord on truss member.</DIV>
<DIV>Truss spacing: 48" o.c.</DIV>
<DIV>Plywood: 48/24 span rating, structural 1, 7/8"</DIV>
<DIV>&nbsp;</DIV>
<DIV>Are 2x framing members permitted for framing spaced at 48" o.c.? </DIV>
<DIV>&nbsp;</DIV>
<DIV>Gina T. Gobo, EIT<BR>Carter &amp; Burgess, Inc<BR>Facilities - Structural 
Engineering<BR>Seattle, WA<BR>Ph. 425-822-7096<BR>Fax 425-822-7246<BR><A 
href="mailto:gobogt(--nospam--at)c-b.com">gobogt(--nospam--at)c-b.com</A></DIV></BODY></HTML>