Quantcast New NAVFAC Roofing Design Criteria -Cont. - aeg_fe0329

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d.  Do not use surface-applied cap flashings. See attachment 5. Surface
applied cap flashings have a high rate of failure.  Install all cap flashings
in reglets raked in masonry joints or cut or cast into concrete. See
attachment. 6.
e. Locate vent stacks, other individual penetrations through the roof,
and projections above the roof not less than 18 inches apart. See attachment
7. Flashings for vent stacks should be as illustrated in attachemeat 8.
f.  When practicable elevate metal roof edges to keep metal work above the
water line.  See attachments 9 and 10.  Avoid strip flashing metal item
longer than 2 feet into the roofing membrane.  Dissimilar coefficients of
expansion and contraction of metal and bituminous materials can cause splits
in the roofing.. Where stripping light gauge metal items lower than two feet
into the roofing membrane cannot be avoided follow guidance provided by
attachment 11 to reduce the chance of splitting.
Install roofing expansion joint covers above the water line. See
attachments 12 and 13.
h. Where there is potential for deflection of the roof assembly at
abutting non-supporting walls and penetrations, design flashings to allow for
differential vertical movement.  See attachments 14, 15, and 16.


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