Dow Protected Membrane Roof EN - Manual (Page 9)

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9
Components
F A B R I C
Installation Notes
Store all materials in dry,
protected areas in an upright
position.
Dow experience has shown
that when STYROFOAM ™ Brand
Extruded Polystyrene Foam
Insulation is exposed to both
direct sunlight and an outdoor
air temperature over 90°F (32°C),
distortion of the foam can occur
in as little as 30 minutes when a
heavy, dark-coloured fabric is over
the insulation. To prevent this
phenomenon during hot weather,
temporarily place white opaque
polyethylene film on the fabric
until the ballast is laid (or use a
white filter fabric).
Install the fabric unadhered
directly over the foam insulation.
Wetting the fabric sometimes
helps secure it until the ballast
can be applied.
Supporting
Documentation
Blueprint 501a: “Protecting
STYROFOAM ™ Brand Insulation
Below Dark Roofing Membranes
and Fabrics”
Extend the fabric up the
roof perimeter cants and roof
protrusions by at least 3" (75 mm)
above the top level of the ballast
(typically about a 6" [150 mm]
upturn) and place it loose under
the metal counterflashings (Figure 5).
Fabrics, such as Fabrene V.I.E., †
should meet or exceed the
guidelines listed in Table 1.
For a complete list of accept-
able filter fabrics, contact a Dow
representative.
Deck
Membrane
Ballast
Filter Fabric
STYROFOAM ™
Flashing
8' 6"
Ballast at 22 lbs/ft 2 to 4 Feet
in from Parapet for Wind Uplift
Around Entire Perimeter of Roof
Brand Foam Insulation
Figure 5: Parapet Detail With Fabric**
T A B L E 1
**This is an illustration of a typical detail. Responsibility for actual design remains that
of the designer.
† Fabrene V.I.E. is a registered trademark of PGI - Fabrene Inc.
Specification Guidelines
Criteria Test Method Units Value
Unit Weight ASTM D1910 oz/yd 2 4.0 (max)
Notch Tear lb
MD ASTM D2262 7.0 (min)
CD 7.0 (min)
Tensile Grab lbf
MD ASTM D1682 70 (min)
CD 60 (min)
Elongation @ break ASTM D1682 % 15 (min)
UV Resistance Approved for outdoor use
Material Woven polyolefin preferred
to promote run-off