Dow Protected Membrane Roof EN - Manual (Page 10)

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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 the STYROFOAM ™
extruded polystyrene insulation
is exposed to both direct sunlight
and an outdoor air temperature
over 90°F, distortion of the foam
can occur in as little as 30 minutes
when a heavy, dark-colored 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.
Install the fabric unadhered
directly over the foam insulation.
Wetting the fabric sometimes
helps secure it until the ballast
can be applied.
Supporting
Documentation
TechNote 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" above
the top level of the ballast
(typically about a 6" 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.
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
Extruded Polystyrene 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