9.
Sealant and closure locations.
10.
Locations for dissimilar metal protection.
11. Details of accessories such as ladders,
walkways, antenna mounts, guy wire fastening,
ventilation equipment and lighting.
12. Details of flashing at all roof penetrations.
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NOTE: When designing standing seam roofs, consider:
1. Consult with manufacturers early in design stage
to obtain current design manuals and structural
information regarding roof attachments. Early
contact will reduce need for corrections and changes
during review process and construction phase.
2. Calculate wind uplift forces in accordance with
Unified Facilities Criteria (UFC) 1-200-01 Design:
General Buidling Requirements.
3. NAVFAC minimum guidelines are one in 24 1/2 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. Sleepers and stub walls have been
successfully used, 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, or
modifications to existing structural shimming system
will be necessary to resist wind forces adequately.
4. It will be necessary to diagram a number of
attachment clips for varying roof conditions. Each
type should be individually designated on the
drawings with spacing shown. Spacing will be a
function of allowable panel span and holding
capability assumed for the clip(s). Minimum holding
force for each type should be specified as
subparagraphs under paragraph entitled "Attachment
Clips." Assure that fasteners used to attach clips
to structure develop full capacity of clip. Check
existing structures to assure that the forces can be
resisted by existing structural system. Make
provisions for thermal expansion of roof structure.
5. Flashing presents a particular design problem in
preventing wind and water infiltration. High winds
create stresses in flashing which must be resisted
by careful detailing of attachment.
While standing seam roofing presents continuous,
sealed surface to the elements, flashing transitions
are often the cause of serious problems. Overhangs,
especially, are susceptible to high wind forces and
SECTION 07612N
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