NOTE: APP membrane materials are allowed on Army
projects only. Delete APP on all other projects and
in any case where torch application is not permitted.
**************************************************************************
[
f.
APP Base Sheet: ASTM D 6222, Type I or II; or ASTM D 6223; Grade
[G][S], minimum 3.5 mm (140 mils) thick at the selvage edge.]
**************************************************************************
NOTE: Specify Grade S cap sheet only with the
approval of the Government and when gravel surfacing
or field applied coating is required in lieu of
factory-applied mineral granule surfacing.
Specify minimum 4 mm (160 mil) APP cap sheet
thickness unless directed otherwise by the
Government.
**************************************************************************
[
g.APP Cap Sheet: ASTM D 6222, Type II; or ASTM D 6223; Grade [G][S],
minimum 4.0 mm (160 mils) thick at selvage edge.]
2.2
BASE FLASHING MEMBRANE
**************************************************************************
NOTE: Include metal clad flashing membrane option
only where the foil surfacing will not create an
aesthetic issue and reflectance of no concern. Do
not specify foil surfaced materials for facilities
along flight line.
Metal clad membrane flashing should not be
considered effective grease protection for the
flashing or roof membrane in areas where the roof
may be exposed to cooking grease release. Lap areas
remain susceptible to degradation from exposure to
grease and solvents.
**************************************************************************
Membrane manufacturer's standard, minimum two-ply modified bitumen membrane
flashing system compatible with the roof membrane specified and as
recommended in membrane manufacturer's published literature. Flashing
membranes shall meet or exceed the properties of the material standards
specified for the modified bitumen [base][ ,interply] and cap sheet, except
that flashing membrane thickness shall be as recommended by the membrane
manufacturer.[ Metal clad flashing membrane shall comply with ASTM D 6298].
[2.3
ASPHALT
**************************************************************************
NOTE: Include paragraph or bracketed requirement
when hot-mopped membranes are used or base sheets
are hot-mopped to non-nailable substrates.
**************************************************************************
ASTM D 312, Type III or IV, in accordance with modified bitumen membrane
manufacturer requirements and compatible with the slope conditions of the
installation.
SECTION 07550
Page 18
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