2.
Supporting structural framework.
3. Intermediate support and attachment details,
when applicable.
4.
Attachment clip spacing.
5.
Flashing support and fastening spacing.
6. Roof venting. (Pay particular attention to
preventing infiltration of wind-driven rain.)
7.
Sealant and closure locations.
8.
Locations for dissimilar metal protection.
9. Details of accessories such as ladders,
walkways, antenna mounts, guy wire fastening,
ventilation equipment, and lightning rods.
10. Details of flashing at all roof penetrations.
On roof plan add note to offset penetrations so
center of penetrations coincide with mid-point of
panel seams.
11. Design loads including stress diagram.
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NOTE: When designing standing seam roofs, consider:
1. Consult with manufacturers early in design stage
to obtain current manuals, specific guidance, and
structural information regarding roof attachment.
Early contact will reduce need for corrections and
changes during review process and construction
phase. Ensure that system detailed and specified
can be provided by three separate manufacturers.
2. Calculate wind uplift forces in accordance with
Unified Facilities Criteria (UFC) 1-200-01 Design:
General Building Requirements. Submit calculations
and stress diagram with design review package.
3. NAVFAC minimum guidelines are one in 24 one-half
inch per foot for roof slopes. Provide greater
slope if possible. In renovation of existing
buildings, adequate slope must often be obtained by
imaginative solutions. Prefabricated steel systems,
sleepers, and stub walls have been used
successfully, but attachment and structural
stability of these must be assured. In some
existing structures it will be difficult to design
strong connections to structural system unless
modifications are made to resist wind forces
adequately.
4. Flashing presents a particular design problem in
preventing wind and water infiltration. High winds
SECTION 07611N
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