ASTM C726 - 17

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Designation: C726 −17
Standard Speciﬁcation for
Mineral Wool Roof Insulation Board
1
This standard is issued under the ﬁxed designation C726; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This speciﬁcation covers the composition and physical
properties of mineral wool insulation board used above struc-
tural roof decks in building construction. The mineral wool
roof insulation acts as a base for systems such as single-ply,
polymer-modiﬁed bitumen and built-up roof. This speciﬁcation
also covers mineral wool insulation boards that incorporate a
ﬁbrous high density upper layer on the top surface
1.2 It is possible that the use of thermal insulation materials
covered by this speciﬁcation will be regulated by building
codes or other agencies that address ﬁre performance, or both.
The ﬁre performance of the material needs to be addressed
through standard ﬁre test methods established by the appropri-
ate governing documents.
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
bility of the regulatory limitations prior to use.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 The following standards, of the issue in effect on the
date of material purchase, form a part of this speciﬁcation to
the extent speciﬁed herein:
2.2 ASTM Standards:
2
C165 Test Method for Measuring Compressive Properties of
Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measure-
ments and Thermal Transmission Properties by Means of
the Guarded-Hot-Plate Apparatus
C203 Test Methods for Breaking Load and Flexural Proper-
ties of Block-Type Thermal Insulation
C209 Test Methods for Cellulosic Fiber Insulating Board
C303 Test Method for Dimensions and Density of Pre-
formed Block and Board–Type Thermal Insulation
C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots
C518 Test Method for Steady-State Thermal Transmission
Properties by Means of the Heat Flow Meter Apparatus
C665 Speciﬁcation for Mineral-Fiber Blanket Thermal Insu-
lation for Light Frame Construction and Manufactured
Housing
C1363 Test Method for Thermal Performance of Building
Materials and Envelope Assemblies by Means of a Hot
Box Apparatus
C1763 Test Method for Water Absorption by Immersion of
Thermal Insulation Materials
D312 Speciﬁcation for Asphalt Used in Rooﬁng
D482 Test Method for Ash from Petroleum Products
D450 Speciﬁcation for Coal-Tar Pitch Used in Rooﬁng,
Dampprooﬁng, and Waterprooﬁng
1
This speciﬁcation is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on
Homogeneous Inorganic Thermal Insulations.
Current edition approved March 1, 2017. Published April 2017. Originally
approved in 1972. Last previous edition approved in 2012 as C726 – 12. DOI:
10.1520/C0726-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
 

D2126 Test Method for Response of Rigid Cellular Plastics
to Thermal and Humid Aging
E84 Test Method for Surface Burning Characteristics of
Building Materials
E2058 Test Methods for Measurement of Material Flamma-
bility Using a Fire Propagation Apparatus (FPA)
2.3 Other Referenced Documents:
CAN/ULC-S102 Standard Method of Test for Surface Burn-
ing Characteristics of Building Materials and Assemblies
3
EN 12430 :1998/A1 Thermal Insulating Product for Build-
ing Applications – Determination of Behaviour Under
Point Load
4
FM 4470 Approval Standard for Single-Ply, Polymer-
Modiﬁed Bitumen Sheet, Built-Up Roof (BUR) and Liq-
uid Applied Roof Assemblies for use in Class 1 and
Noncombustible Roof Deck Constructions
5
ISO 1716 :2002, Reaction-to-Fire Tests for Building Prod-
ucts – Determination of the Heat of Combustion
6
3. Terminology
3.1 Deﬁnitions:Terms used in this speciﬁcation are deﬁned
in Terminology C168.
3.1.1 noncombustible core—a ﬁbrous roof insulation prod-
uct conforming to the ash content, visible ﬂaming and heat of
combustion requirements 12.11.
4. Classiﬁcation
4.1 The thermal insulation shall be of the following types,
classes and grades;
4.1.1 Type I—Roof insulation board comprised of a mono-
lithic ﬁbrous material having a ﬁbrous high density upper
surface layer and a lower density ﬁbrous bottom layer.
4.1.1.1 Class 1—Minimum upper surface layer actual den-
sity of 11.2 lb/ft
3
(180 kg/m
3
) and a minimum lower layer
actual density of 7.5 lb/ft
3
(120 kg/m3).
4.1.1.2 Class 2—Upper surface layer and lower surface
layer density less than Class 1.
(1) Grade A – Minimum point load of 146 lbf (650 N).
(2) Grade B – Point load < 146 lbf (650 N).
4.1.2 Type II—Roof insulation board of singular density.
4.1.2.1 Class 1—Minimum actual density of 9 lb/ft
3
(144
kg/m
3
).
4.1.2.2 Class 2—Actual density less than Class 1.
5. Ordering Information
5.1 Orders for material purchased under this speciﬁcation
shall include:
5.1.1 Designation of this speciﬁcation,
5.1.2 Product name,
5.1.3 Board dimensions,
5.1.4 Quantity of material, and
5.1.5 Special packaging or marking, (14.1 and 14.2)if
required.
6. Materials and Manufacture
6.1 Mineral wool roof insulation board shall consist of
mineral wool with an organic resin or other suitable binder.
6.2 For built-up rooﬁng or polymer modiﬁed bitumen sys-
tems the board shall be faced during manufacture on one
surface with a cover adequate for the application of Speciﬁca-
tion D312 asphalt or Speciﬁcation D450 coal-tar pitch.
6.3 For single ply membrane systems the board shall be
permitted to be faced or unfaced. For mechanically fastened
single ply membrane systems the board shall be permitted to be
faced or unfaced. For adhered single ply membrane systems
the board shall be permitted to be faced during manufacture on
one surface with a cover adequate for the application of the
adhesive used to secure the single ply membrane.
7. Physical Properties
7.1 The average thermal resistance, R, of specimens
sampled in accordance with Practice C390 shall be as speciﬁed
by the manufacturer.
7.2 Nominal thickness required to obtain the speciﬁed
resistance or conductance shall be as stated by the manufac-
turer.
7.3 Roof insulation boards shall have the limiting property
values shown in Table 1.
8. Dimensions and Tolerances
8.1 The dimensions shall be as agreed upon between the
purchaser and manufacturer. Tolerances shall be as follows:
Tolerance, in. (mm)
Long dimension ±
1
⁄
4
(6)
Short dimension ±
1
⁄
4
(6)
Thickness ±
1
⁄
8
(3)
The long and short dimension tolerances in this section are
for individual boards. The tolerance for long and short dimen-
sion averages for at least 20 boards shall be 6
1
⁄
16
in. (2 mm).
8.2 Board squareness shall be within required tolerance if
the two diagonal measurements of the board differ by no more
than
1
⁄
4
in. (6 mm).
8.3 Board ﬂatness shall be within required tolerance if,
when board is placed concave side up, the average distance
between a ﬂat supporting surface and the bottom board surface
at the corners does not exceed
5
⁄
16
in. (8 mm) over a
temperature range from 20 to 140°F (−7 to 60°C). Maximum
distance at an individual corner shall not exceed
1
⁄
2
in. (13
mm).
8.4 The thermal resistance of any single specimen shall not
be more than 10 % below the value speciﬁed by the manufac-
turer.
8.5 Mass per unit area of any board, lb/ft
2
(kg/m
2
) shall be
within 10 % of the value speciﬁed by the manufacturer.
Average mass per unit area of at least 20 boards shall be within
5 % of the value speciﬁed by the manufacturer.
3
Available from Underwriters Laboratories (UL), 2600 N.W. Lake Rd., Camas,
WA 98607-8542, http://www.ul.com.
4
Available from European Committee for Standardization (CEN), Avenue
Marnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.
5
FM Approvals, 1151 Boston-Providence Turnpike, P.O. Box 9102, Norwood,
MA 02062.
6
Available from International Organization for Standardization (ISO), 1, ch. de
la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
C726 − 17
2
 

9. Workmanship, Finish, and Appearance
9.1 Insulation boards shall not have visible defects that will
adversely affect service qualities.
10. Sampling
10.1 Sampling for qualiﬁcation tests, if required, shall be in
accordance with Practice C390. Qualiﬁcation tests will be
conducted on the physical requirements in 7.1 and Table 1.
10.2 Sampling for inspection tests, if required, shall be in
accordance with Practice C390. Inspection requirements are
dimensions (Section 8) plus any other properties as agreed
upon between the purchaser and manufacturer.
11. Specimen Preparation
11.1 Specimens for all tests shall include any factory-
applied cover. Take care that the cover is not partially detached
in the process of cutting specimens.
11.2 Unless otherwise speciﬁed, condition samples prior to
cutting specimens for at least 12 h at 73 62°F (24 61°C), 50
65 % relative humidity before testing.
11.3 Unless otherwise stated testing of Type I product shall
be done with the higher density surface layer facing up.
12. Test Methods
12.1 Thermal Resistance—Test Method C177,C518, or Test
Method C1363 at a mean temperature of 75 62°F (24 61°C)
and 40°F (22°C) minimum temperature gradient across the
thickness of the test specimen or at a mean temperature agreed
upon between the purchaser and manufacturer. Some typical
additional mean temperatures of interest are 25°F (–4°C) and
110°F (43°C).
12.2 Compressive Resistance—Test Method C165, Proce-
dure A. Crosshead speed shall be 0.1 60.01 in. (2.5 60.25
mm) for each 1 in. (25.4 mm) of specimen thickness. A total of
four (4) specimens shall be tested with one (1) specimen from
each of four (4) different boards. The average of the results
shall not be less than those deﬁned in Table 1 and any
individual specimen shall not be less than 90 % of the
minimum in Table 1.
12.3 Tensile Strength Perpendicular to the Board Surface—
Test Methods C209, see Test Conditions and Tensile Strength
Perpendicular to Surface, except that the specimens shall be 6
by 6 in. (150 by 150 mm). A total of four (4) specimens shall
be tested with one (1) specimen from each of four (4) different
boards. The average of the results shall not be less than those
deﬁned in Table 1 and any individual specimen shall not be less
than 90 % of the minimum in Table 1.
12.4 Breaking Load—Test Methods C203, Method I, Pro-
cedure D. Specimen width shall be 6 in. (152 mm) and support
span shall be 10 in. (254 mm). A total of four (4) specimens
shall be tested with one (1) specimen from each of four (4)
different boards. The average of the results shall not be less
than those deﬁned in Table 1 and any individual specimen shall
not be less than 90 % of the minimum in Table 1.
12.5 Water Absorption—Test Method C1763, Method B.
When material is thicker than 1.0 in., split the material to give
a specimen thickness of 1.00 60.03 in. For Type 1 product,
test at 1 inch or the minimum manufactured thickness as slicing
would not provide a representative specimen. The test speci-
men shall include the faced side of the material if applicable.
Immerse the specimen with the faced surface down. A total of
four (4) specimens shall be tested with one (1) specimen from
each of four (4) different boards.
12.6 Surface Burning Characteristics of Building
Materials—Test with the bottom surface exposed to the test
ﬂame. Test in accordance with Test Method E84. For Canada,
test in accordance with Test Method CAN/ULC-S102. When
the referenced Canadian document in this speciﬁcation is
referred to in applicable Canadian building codes, the editions,
referenced by those building codes, shall govern.
12.7 Dimensions—Test Methods C209, see Test Conditions,
Thickness, and Size of Finished Board.
TABLE 1 Physical Properties
Property Requirement
Type I:
Class 1–Minimum Upper Density, lb/ft
3
(kg/m
3
) 11.2 (180)
Minimum Lower Density, lb/ft
3
(kg/m
3
) 7.5 (120)
Class 2–Upper Density, lb/ft
3
(kg/m
3
) <11.2 (180)
Lower Density, lb/ft
3
(kg/m
3
) <7.5 (120)
Type II:
Class 1 Minimum Density, lb/ft
3
(kg/m3) 9.0 (144)
Class 2 Density, lb/ft
3
(kg/m
3
) <9.0 (144)
Compressive resistance:
at 25 % deformation, min, psi (kPa) 12 (83)
at 10 % deformation min, psi (kPa) 7 (48)
Tensile strength perpendicular to board surface, min,
lbf/ft
2
(kPa)
450 (22)
Breaking load, min, lbf (N):
Type 1 60 (266)
Type 2 30 (133)
Water absorption, max, volume % 5
A
Dimensional Stability:
% Linear Change, Thickness, Max
+200 ± 4°F (93 ± 2°C) <1
-40±6°F(-40±3°C) <1
+158 ±4 °F (70 ± 2°C) <1
% Linear Change, Length and Width, Max
+200 ± 4°F (93± 2°C) <1
-40±6°F(-40±3°C) <1
+158 ± 4°F (70 ± 2°C) <1
Point Load at 5mm compression, min, N: Type I 650
Noncombustible Core
Ash content (%) $90
Visible Flaming None
Heat of Combustion, max, BTU/lb (kJ/g) 860 (2.0)
Corrosiveness Shall meet
requirements of
Speciﬁcation C665
for Steel
Surface Burning Characteristics Flame Spread #25
Smoke #50
A
There shall be no delamination during the water absorption test.
C726 − 17
3
 

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摘要：

ASTM C726 - 17 是一项由美国材料与试验协会（ASTM）发布的关于预制单层玻璃纤维基隔热材料的标准规范，该标准主要适用于金属建筑屋顶和墙体的隔热应用。这份标准详细规定了以玻璃纤维为基材、带有覆面的隔热毡的物理性能、尺寸公差、热阻值（R值）、抗拉强度以及防火性能等技术要求。ASTM C726 - 17 旨在确保隔热材料在建筑结构中具备长期稳定的保温效果，同时满足安装过程中的机械强度和耐久性要求。该标准适用于商业和工业建筑的金属屋面系统，特别是在需要高效节能与防火安全的场合。通过遵循此标

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