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  Johns Manville Commerical Industrial Roofing Systems\Roof Insulations Roof Insulations - Page 7
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Roof Insulations |
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Fiber
Glass™ Roof Insulation |
Description
JM Fiber Glass Roof Insulation is composed of inorganic
glass fibers which are bound by
a resinous binder and manufactured in rigid board form. The boards are top surfaced with
asphalt, a fiber glass scrim reinforcement and kraft paper to provide a tough,
impact-resistant surface to
support the roof membrane.
Application
Fiber Glass Roof Insulation is used as a mid-thermal
insulation on metal, nailable
and non-nailable roof decks. It is also particularly suited for use in reroof conditions
where an existing roof, or a portion of an existing roof, is left in place. It can be
applied using hot asphalt or mechanical fasteners and is compatible with many built-up and
modified bitumen roofing systems. It is not recommended for use with single ply systems without an approved cover board.
Sizes
Fiber Glass Roof Insulation is available in 4' x 4' (1.22 m
x 1.22 m) and 4' x 8' (1.22 m x
2.44 m) boards. Thicknesses range from ¾" (19 mm) to 3" (76 mm).
Advantages
Strength and Durability. When applied over
rigid decks, Fiber Glass Roof
Insulation resists damage from on-the-job and maintenance traffic. It offers an excellent
substrate for many built-up and modified bitumen membranes, and effectively bridges flute openings in metal decks.
Dimensional Stability. Because of its
inorganic fiber glass composition, Fiber Glass Roof Insulation is dimensionally stable over a wide range of weather conditions.
Fire Resistance. Fiber Glass Roof
Insulation has excellent fire resistance and is approved
for use in numerous FM and UL approved constructions.
Mopping Surface. Fiber Glass Roof
Insulation provides an excellent base to receive a built-up or SBS modified bitumen membrane. It has excellent compatibility with hot asphalt.
Stable R-Value. Fiber Glass Roof
Insulation has a stable R-value because it is composed
of inorganic fiber glass materials.
Tapered Fiber Glass Roof
Insulation
Tapered Fiber Glass Roof Insulation is available on
request. Contact your JM Sales Representative for details.
Thermal Values
|
| Thickness (nom.) |
C-Value (Conductance) |
R-Value (Resistance) |
Nominal Weight |
| in |
mm |
BTU/(hr - ft2 - °F) |
W/m2 - °C |
(hr - ft2 - °F)/BTU |
m2 - °C/W |
lb/ft2 |
kg/m2 |
|
3/4
15/16
1 1/16
1 5/8
2
2 1/4
3 |
19
24
27
41
51
57
76 |
0.36
0.27
0.24
0.15
0.125
0.11
0.08 |
2.04
1.53
1.36
0.85
0.71
0.62
0.45 |
2.78
3.70
4.17
6.67
8.00
9.09
12.50 |
0.49
0.65
0.74
1.18
1.41
1.61
2.22 |
0.78
0.94
0.91
1.32
1.59
1.71
2.26 |
3.81
4.60
4.44
6.44
7.76
8.34
11.03 |
|
Applicable Standards
Fiber Glass Roof Insulation complies with the requirements
of ASTM C 726 (except for
compressive strengths on products with 1" [25 mm] or greater thickness).
Factory Mutual
Fiber Glass Roof Insulation has been rated in Factory
Mutual fire and wind-resistant
systems for BUR and modified bitumen constructions. This testing is specific to the roof
deck, insulation, fastener, fastener pattern and the membrane. For current information on
JM FM approved systems, contact a JM Technical Service Specialist, JM Sales Representative
or consult the current FM
Approval Guide.
Underwriters Laboratories
Fiber Glass Roof Insulation is classified by Underwriters
Laboratories, Inc. and is
approved insulation for numerous Class A roof constructions. Contact a JM Technical
Service Specialist for details regarding specific approvals.
Fiber Glass Roof Insulation is also listed by Underwriters
Laboratories, Inc. for use in
Construction Numbers 1, 2, 14, 120, 123, 156, and 374. See the current UL Roofing Materials and Systems Directory.
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