Specification

Product Data Sheet
FOAMULAR
®
250
Extruded Polystyrene (XPS) Rigid Foam Insulation
• Provides a weather resistant
barrier (when joints are sealed)
to enhance the building’s
resistance to air and moisture
penetration
Technical Information
This product is combustible. A
protective barrier or thermal
barrier is required as speci ed
in the appropriate building
code. For additional information,
consult MSDS or contact Owens
Corning World Headquarters at
1-800-GET-PINK
®
.
All construction should be
evaluated for the necessity to
provide vapor retarders. See
current ASHRAE Handbook of
Fundamentals.
FOAMULAR
®
250 XPS Insulation
is a non-structural material and
must be installed on framing
which is independently braced
and structurally adequate to meet
required construction and service
loading conditions.
FOAMULAR
®
insulation can be
exposed to the exterior during
normal construction cycles.
During that time some fading
of color may begin due to UV
exposure, and, if exposed for
extended periods of time, some
degradation or “dusting” of the
polystyrene surface may begin. It
is best if the product is covered
within 60 days to minimize
degradation. Once covered, the
deterioration stops, and damage
is limited to the thin top surface
layers of cells. Cells below are
generally unharmed and still
useful insulation.
Typical Physical Properties
1
FOAMULAR
®
250 Extruded Polystyrene Insulation
Property Test Method
2
Value
Thermal Resistance
3
, R-Value (180 day) minimum,
hr•ft
2
•°F/Btu (RSI, °C•m
2
/W)
@ 75°F (24°C) mean temperature ASTM C 518
¾ " Thickness 4.0 (0.70)
1" Thickness 5.0 (0.88)
1½ " Thickness 7.5 (1.32
2" Thickness 10 (1.76)
2½ " Thickness 12.5 (2.20)
3" Thickness 15 (2.64)
4" Thickness 20 (3.52)
@ 40°F (4.4°C) mean temperature
¾ " Thickness 4.3 (0.76)
1" Thickness 5.4 (0.95)
1½ " Thickness 8.1 (1.43)
2" Thickness 10.8 (1.90)
2½ " Thickness 13. 5 (2 . 38)
3" Thickness 16.2 (2.85)
4" Thickness 21.6 (3.80)
Long Term Thermal Resistance, LTTR-Value
3,
minimum
hr•ft
2
•°F/Btu (RSI, °C•m
2
/W)
@ 75°F (24°C) mean temperature CAN/ULC S770-03
¾ " Thickness N/A
1" Thickness 5.0 (0.88)
1½ " Thickness 7.8 (1.37)
2" Thickness 10.6 (1.87)
2½ " Thickness 13.4 ( 2 .36)
3" Thickness 16.2 (2.85)
4" Thickness 22.0 (3.87)
Compressive Strength
4
, minimum psi (kPa) ASTM D 1621 25 (172)
Flexural Strength
5
, minimum psi (kPa) ASTM C 203 75 (517)
Water Absorption
6
, maximum % by volume ASTM C 272 0.10
Water Vapor Permeance
7
, maximum perm (ng/Pa•s•m
2
) ASTM E 96 1.5 (86)
Dimensional Stability, maximum % linear change ASTM D 2126 2.0
Flame Spread
8, 9
ASTM E 84 5
Smoke Developed
8, 9, 10
ASTM E 84 45-175
Oxygen Index
8
, minimum % by volume ASTM D 2863 24
Service Temperature, maximum °F (°C) — 165 (74)
Linear Coef cient of Thermal Expansion, in/in/ºF (m/m°C) ASTM E 228 3.5 x 10
-5
(6.3 x 10
-5
)
1. Properties shown are representative values for 1" thick material, unless otherwise speci ed.
2. Modi ed as required to meet ASTM C 578
3. R means the resistance to heat  ow; the higher the value, the greater the insulation power. This insulation must be
installed properly to get the marked R-value. Follow the manufacturer’s instructions carefully. If a manufacturer’s
fact sheet is not provided with the material shipment, request this and review it carefully. R-values vary depending
on many factors including the mean temperature at which the test is conducted, and the age of the sample at
the time of testing. Because rigid foam plastic insulation products are not all aged in accordance with the same
standards, it is useful to publish comparison R-value data. The R-value for FOAMULAR
®
XPS insulation is provided
from testing at two mean temperatures, 40ºF and 75ºF, and from two aging (conditioning) techniques, 180 day real-
time aged (as mandated by ASTM C 578) and a method of accelerated aging sometimes called “Long Term Thermal
Resistance” (LTTR) per CAN/ULC S770-03. The R-value at 180 day real-time age and 75ºF mean temperature is
commonly used to compare products and is the value printed on the product.
4. Values at yield or 10% de ection, whichever occurs  rst.
5. Value at yield or 5%, whichever occurs  rst.
6. Data ranges from 0.00 to value shown due to the level of precision of the test method.
7. Water vapor permeance decreases as thickness increases.
8. These laboratory tests are not intended to describe the hazards presented by this material under actual  re conditions.
9. Data from Underwriters Laboratories Inc.
®
classi ed. See Classi cation Certi cate U-197.
10. ASTM E 84 is thickness-dependent, therefore a range of values is given.