ASTM D4477-24
(Specification)Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit
Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit
ABSTRACT
This specification establishes the physical requirements and test methods for extruded single-wall soffits manufactured from rigid (unplasticized) poly(vinyl chloride) (PVC) compounds. The PVC compound when extruded into soffit shall maintain uniform color and be free of any visual surface or structural changes such as peeling, chipping, cracking, flaking, or pitting. Materials shall undergo testing and shall conform accordingly to requirements in terms of dimension (length, width, and thickness), camber, initial impact resistance, coefficient of linear expansion, gloss, deflection, and color.
SCOPE
1.1 This specification establishes requirements and test methods for the materials, dimensions, camber, impact strength, expansion, and appearance of extruded single-wall soffit manufactured from rigid (unplasticized) PVC compound. Methods of indicating compliance with this specification are also provided.
1.2 The use of PVC recycled plastic in this product shall be in accordance with the requirements in Section 4.
1.3 Soffit produced to this specification shall be installed in accordance with the manufacturer's installation instructions for the specific product to be installed.
Note 1: Information with regard to soffit maintenance shall be obtained from the manufacturer.
1.4 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.
1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification. 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 2: There is no known ISO equivalent to this standard.
1.6 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.
General Information
- Status
- Published
- Publication Date
- 31-Mar-2024
- Technical Committee
- D20 - Plastics
- Drafting Committee
- D20.24 - Plastic Building Products
Relations
- Replaces
ASTM D4477-22 - Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit - Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Referred By
ASTM D4803-24 - Standard Test Method for Predicting Heat Buildup in PVC Building Products - Effective Date
- 01-Apr-2024
Overview
ASTM D4477-24: Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit sets comprehensive requirements for extruded single-wall soffit products made from rigid, unplasticized poly(vinyl chloride) (PVC) compounds. This standard, published by ASTM International, is designed to ensure soffits used in building construction meet essential criteria in terms of physical properties, durability, and appearance. D4477-24 is widely recognized in the construction and plastics industries for evaluating and specifying PVC soffit products used to clad the underside of roof overhangs.
The specification details test methods, dimensional tolerances, impact resistance, color uniformity, gloss, and compliance demonstration. It covers both virgin and recycled rigid PVC material. The document is intended for manufacturers, builders, architects, and specifiers who require assurance of product performance and consistency.
Key Topics
Material Requirements
- Rigid (unplasticized) PVC compounds are used to assure strength and weatherability.
- Recycled PVC can be utilized if all other specification criteria are met.
Physical Properties
- Control of dimensions (length, width, thickness) to tight tolerances.
- Camber limits to maintain installation quality.
- Minimum impact resistance values.
- Limits on coefficient of linear expansion for thermal stability.
- Gloss and color uniformity requirements for consistent aesthetic appearance.
- Maximum allowed deflection when soffit is installed horizontally.
- Restrictions on use of elemental lead and lead compounds.
Test Methods and Compliance
- Reference to standardized ASTM procedures for testing burning rate, gloss, impact resistance, and color specifications.
- Explicit product marking instructions for indicating conformity.
- Quality control and sampling guidance for manufacturers.
Packaging and Protection
- Packaging requirements to prevent damage during handling, storage, and transportation.
Applications
ASTM D4477-24 is applicable across a range of construction and renovation projects where rigid PVC soffit is specified, especially in:
Residential Buildings
- Used to protect and enhance the underside of eaves and roof overhangs.
- Offers low maintenance, durability, and weather resistance.
Commercial and Institutional Buildings
- Provides a finished appearance while ensuring ventilation and protection from pests and moisture.
- Suitable for both new construction and building retrofits.
Manufacturing and Supply Chains
- Manufacturers use the standard to certify product compliance.
- Architects and specifiers reference this standard to ensure high-quality, consistent material in project documentation.
- Contractors and installers can be confident in performance and installation compatibility.
By adhering to ASTM D4477-24, stakeholders benefit from standardized product expectations, improved building envelope performance, and reduced risk of product failures.
Related Standards
Several ASTM standards and practices support and complement the requirements of D4477-24, including:
- ASTM D618: Practice for Conditioning Plastics for Testing
- ASTM D635: Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position
- ASTM D696: Test Method for Coefficient of Linear Thermal Expansion of Plastics
- ASTM D883: Terminology Relating to Plastics
- ASTM D2244: Practice for Calculation of Color Tolerances and Color Differences
- ASTM D2457: Test Method for Specular Gloss of Plastic Films and Solid Plastics
- ASTM D3892: Practice for Packaging/Packing of Plastics
- ASTM D4226: Test Methods for Impact Resistance of Rigid PVC Building Products
Note: There is currently no direct ISO equivalent for ASTM D4477-24.
Keywords: rigid PVC soffit, unplasticized polyvinyl chloride, ASTM D4477, plastic building products, soffit specification, recycled plastics, soffit installation, weather-resistant soffit.
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Frequently Asked Questions
ASTM D4477-24 is a technical specification published by ASTM International. Its full title is "Standard Specification for Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit". This standard covers: ABSTRACT This specification establishes the physical requirements and test methods for extruded single-wall soffits manufactured from rigid (unplasticized) poly(vinyl chloride) (PVC) compounds. The PVC compound when extruded into soffit shall maintain uniform color and be free of any visual surface or structural changes such as peeling, chipping, cracking, flaking, or pitting. Materials shall undergo testing and shall conform accordingly to requirements in terms of dimension (length, width, and thickness), camber, initial impact resistance, coefficient of linear expansion, gloss, deflection, and color. SCOPE 1.1 This specification establishes requirements and test methods for the materials, dimensions, camber, impact strength, expansion, and appearance of extruded single-wall soffit manufactured from rigid (unplasticized) PVC compound. Methods of indicating compliance with this specification are also provided. 1.2 The use of PVC recycled plastic in this product shall be in accordance with the requirements in Section 4. 1.3 Soffit produced to this specification shall be installed in accordance with the manufacturer's installation instructions for the specific product to be installed. Note 1: Information with regard to soffit maintenance shall be obtained from the manufacturer. 1.4 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. 1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification. 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 2: There is no known ISO equivalent to this standard. 1.6 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.
ABSTRACT This specification establishes the physical requirements and test methods for extruded single-wall soffits manufactured from rigid (unplasticized) poly(vinyl chloride) (PVC) compounds. The PVC compound when extruded into soffit shall maintain uniform color and be free of any visual surface or structural changes such as peeling, chipping, cracking, flaking, or pitting. Materials shall undergo testing and shall conform accordingly to requirements in terms of dimension (length, width, and thickness), camber, initial impact resistance, coefficient of linear expansion, gloss, deflection, and color. SCOPE 1.1 This specification establishes requirements and test methods for the materials, dimensions, camber, impact strength, expansion, and appearance of extruded single-wall soffit manufactured from rigid (unplasticized) PVC compound. Methods of indicating compliance with this specification are also provided. 1.2 The use of PVC recycled plastic in this product shall be in accordance with the requirements in Section 4. 1.3 Soffit produced to this specification shall be installed in accordance with the manufacturer's installation instructions for the specific product to be installed. Note 1: Information with regard to soffit maintenance shall be obtained from the manufacturer. 1.4 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. 1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification. 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 2: There is no known ISO equivalent to this standard. 1.6 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.
ASTM D4477-24 is classified under the following ICS (International Classification for Standards) categories: 83.080.20 - Thermoplastic materials. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D4477-24 has the following relationships with other standards: It is inter standard links to ASTM D4477-22, ASTM D3679-24, ASTM E2266-22, ASTM D4803-24. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D4477-24 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: D4477 − 24 An American National Standard
Standard Specification for
Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit
This standard is issued under the fixed designation D4477; 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.
1. Scope* 2. Referenced Documents
2.1 ASTM Standards:
1.1 This specification establishes requirements and test
D618 Practice for Conditioning Plastics for Testing
methods for the materials, dimensions, camber, impact
D635 Test Method for Rate of Burning and/or Extent and
strength, expansion, and appearance of extruded single-wall
Time of Burning of Plastics in a Horizontal Position
soffit manufactured from rigid (unplasticized) PVC compound.
D696 Test Method for Coefficient of Linear Thermal Expan-
Methods of indicating compliance with this specification are
sion of Plastics Between −30°C and 30°C with a Vitreous
also provided.
Silica Dilatometer
1.2 The use of PVC recycled plastic in this product shall be D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plas-
in accordance with the requirements in Section 4.
tics (Withdrawn 2024)
1.3 Soffit produced to this specification shall be installed in
D2244 Practice for Calculation of Color Tolerances and
accordance with the manufacturer’s installation instructions for
Color Differences from Instrumentally Measured Color
the specific product to be installed.
Coordinates
D2457 Test Method for Specular Gloss of Plastic Films and
NOTE 1—Information with regard to soffit maintenance shall be
Solid Plastics
obtained from the manufacturer.
D3892 Practice for Packaging/Packing of Plastics
1.4 The values stated in inch-pound units are to be regarded
D4226 Test Methods for Impact Resistance of Rigid Poly-
as standard. The values given in parentheses are mathematical
(Vinyl Chloride) (PVC) Building Products
conversions to SI units that are provided for information only
D5033 Guide for Development of ASTM Standards Relating
and are not considered standard.
to Recycling and Use of Recycled Plastics (Withdrawn
2007)
1.5 The following precautionary caveat pertains to the test
D5947 Test Methods for Physical Dimensions of Solid
method portion only, Section 6 of this specification. This
Plastics Specimens
standard does not purport to address all of the safety concerns,
E631 Terminology of Building Constructions
if any, associated with its use. It is the responsibility of the user
E1753 Practice for Use of Qualitative Chemical Spot Test
of this standard to establish appropriate safety, health, and
Kits for Detection of Lead in Dry Paint Films
environmental practices and determine the applicability of
regulatory limitations prior to use.
3. Terminology
3.1 Definitions—Definitions are in accordance with Termi-
NOTE 2—There is no known ISO equivalent to this standard.
nologies D883, D1600, and E631, unless otherwise specified.
1.6 This international standard was developed in accor-
3.2 Definitions of Terms Specific to This Standard:
dance with internationally recognized principles on standard-
3.2.1 nominal, (as related to dimensions of vinyl soffıts),
ization established in the Decision on Principles for the
adj—the value that a manufacturer consistently uses to repre-
Development of International Standards, Guides and Recom-
sent a specific property or dimension of a vinyl soffit product in
mendations issued by the World Trade Organization Technical
public claims including, but not limited to, product literature,
Barriers to Trade (TBT) Committee.
advertisements, quotations, and certificates of conformance.
1 2
This specification is under the jurisdiction of ASTM Committee D20 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Plastics and is the direct responsibility of Subcommittee D20.24 on Plastic Building contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Products. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2024. Published April 2024. Originally the ASTM website.
approved in 1985. Last previous edition approved in 2022 as D4477 – 22. DOI: The last approved version of this historical standard is referenced on
10.1520/D4477-24. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4477 − 24
3.2.2 vinyl soffıt, n—a shaped material, made principally 5.6 Gloss—This requirement is not applicable to surface
from rigid poly(vinyl chloride) (PVC) that is used to clad the ventilated soffit. The gloss of soffit shall be uniform across the
underside of a roof overhang. exposed face. The average of all readings for a panel deter-
3.2.2.1 Discussion—Any exception to a homogeneous rigid mined in 6.9.1.2 shall not differ from the manufacturer’s
specified gloss value more than the permitted variation in Table
PVC compound is present in a coextruded or laminated
capstock. 1, and each individual reading shall not vary more than 10
points from the average. Gloss shall be tested in accordance
4. Materials and Manufacture with 6.9.
TABLE 1
4.1 The soffit, shall be made of one or more layers of
Manufacturer’s Permitted difference
poly(vinyl chloride) (PVC) compound. Any layers of materials
Specified Gloss Value from
other than poly (vinyl chloride) (PVC) compound shall be kept
Mfg. Spec. Gloss
Value
to less than 20% by volume.
Less than or equal to 35 ±8
4.2 Use rigid PVC recycled plastic, as defined in Guide Greater than 35 ±10
D5033 if all the requirements in the sections on Terminology 1
5.7 Deflection of the soffit shall not exceed 6 ⁄8 in. (3.2
(Section 3), on Materials and Manufacture (Section 4), and on
mm) when installed flat in a horizontal position over a span of
Physical Requirements (Section 5) are met by the soffit
24 in. (610 mm) without intermittent support when tested in
containing PVC recycled plastic.
accordance with 6.11.
4.3 The poly(vinyl chloride) soffit material, when tested in
5.8 Uniformity of Color—When tested in accordance with
accordance with Test Method D635, shall not exceed an
6.10, the total color change, E, between a production specimen
average extent of burn of 4 in. (100 mm), with an average time
and the appropriate reference specimen or agreed-upon color
of burn not to exceed 10 s. A minimum sample thickness of
coordinates shall not vary by more than 1.5, and the chromatic
0.030 in. (0.8 mm) is required. (Warning—The flammability
coordinates shall not change by more than 6Δa = 1.0 and6Δ
testing data, conclusions, and recommendations of Test
b = 1.0.
Method D635 relate solely to the measurement and description
of properties for classification of the poly(vinyl chloride) soffit 6. Test Methods
material in response to flame under controlled laboratory
6.1 General—The inspection and test procedures contained
conditions and shall not be used for the description or appraisal
in this section are used to determine the conformance of
of the fire hazard of vinyl soffit under actual fire conditions.)
products to the requirements of this specification. Each pro-
ducer who represents its products as conforming to this
4.4 The PVC compound, when extruded into soffit, shall
specification shall be permitted to use statistically based
maintain uniform color and be free of any visual surface or
sampling plans that are appropriate for each manufacturing
structural changes, such as peeling, chipping, cracking, flaking,
process, but shall keep the essential records necessary to
or pitting.
document, with a high degree of assurance, his claim that all of
4.5 PVC soffit shall not contain elemental lead (Pb) or
the requirements of this specification have been met.
compounds of that material other than traces incidental to raw
6.2 Conditioning and Test Conditions—Condition the test
materials or the manufacturing process. Compliance with this
specimen in accordance with Procedure A of Practice D618 and
requirement shall be demonstrated by one of the methods in
test under those conditions, unless otherwise specified herein.
6.12.
6.3 Length—Lay the specimen on a flat surface and measure
5. Physical Requirements
with a steel tape. Measure the length of a soffit panel
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4477 − 22 D4477 − 24 An American National Standard
Standard Specification for
Rigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit
This standard is issued under the fixed designation D4477; 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.
1. Scope Scope*
1.1 This specification establishes requirements and test methods for the materials, dimensions, camber, impact strength, expansion,
and appearance of extruded single-wall soffit manufactured from rigid (unplasticized) PVC compound. Methods of indicating
compliance with this specification are also provided.
1.2 The use of PVC recycled plastic in this product shall be in accordance with the requirements in Section 4.
1.3 Soffit produced to this specification shall be installed in accordance with Practice D4756. Reference shall also be made to the
manufacturer’s installation instructions for the specific product to be installed.
NOTE 1—Information with regard to soffit maintenance shall be obtained from the manufacturer.
1.4 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.
1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification. 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory
limitations prior to use.
NOTE 2—There is no known ISO equivalent to this standard.
1.6 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.
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D635 Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position
D696 Test Method for Coefficient of Linear Thermal Expansion of Plastics Between −30°C and 30°C with a Vitreous Silica
Dilatometer
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.24 on Plastic Building Products.
Current edition approved May 1, 2022April 1, 2024. Published May 2022April 2024. Originally approved in 1985. Last previous edition approved in 20212022 as
D4477 – 21.D4477 – 22. DOI: 10.1520/D4477-22.10.1520/D4477-24.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4477 − 24
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
D2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
D2457 Test Method for Specular Gloss of Plastic Films and Solid Plastics
D3892 Practice for Packaging/Packing of Plastics
D4226 Test Methods for Impact Resistance of Rigid Poly(Vinyl Chloride) (PVC) Building Products
D4756 Practice for Installation of Rigid Poly(Vinyl Chloride) (PVC) Siding and Soffit (Withdrawn 2023)
D5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics (Withdrawn 2007)
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E631 Terminology of Building Constructions
E1753 Practice for Use of Qualitative Chemical Spot Test Kits for Detection of Lead in Dry Paint Films
3. Terminology
3.1 Definitions—Definitions are in accordance with Terminologies D883, D1600, and E631, unless otherwise specified.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 nominal, (as related to dimensions of vinyl soffıts), adj—the value that a manufacturer consistently uses to represent a specific
property or dimension of a vinyl soffit product in public claims including, but not limited to, product literature, advertisements,
quotations, and certificates of conformance.
3.2.2 vinyl soffıt, n—a shaped material, made principally from rigid poly(vinyl chloride) (PVC) that is used to clad the underside
of a roof overhang.
3.2.2.1 Discussion—
Any exception to a homogeneous rigid PVC compound is present in a coextruded or laminated capstock.
4. Materials and Manufacture
4.1 The soffit, shall be made of one or more layers of poly(vinyl chloride) (PVC) compound. Any layers of materials other than
poly (vinyl chloride) (PVC) compound shall be kept to less than 20% by volume.
4.2 Use rigid PVC recycled plastic, as defined in Guide D5033 if all the requirements in the sections on Terminology (Section 3),
on Materials and Manufacture (Section 4), and on Physical Requirements (Section 5) are met by the soffit containing PVC recycled
plastic.
4.3 The poly(vinyl chloride) soffit material, when tested in accordance with Test Method D635, shall not exceed an average extent
of burn of 4 in. (100 mm), with an average time of burn not to exceed 10 s. A minimum sample thickness of 0.030 in. (0.8 mm)
is required. (Warning—The flammability testing data, conclusions, and recommendations of Test Method D635 relate solely to
the measurement and description of properties for classification of the poly(vinyl chloride) soffit material in response to flame
under controlled laboratory conditions and shall not be used for the description or appraisal of the fire hazard of vinyl soffit under
actual fire conditions.)
4.4 The PVC compound, when extruded into soffit, shall maintain uniform color and be free of any visual surface or structural
changes, such as peeling, chipping, cracking, flaking, or pitting.
4.5 PVC soffit shall not contain elemental lead (Pb) or compounds of that material other than traces incidental to raw materials
or the manufacturing process. Compliance with this requirement shall be demonstrated by one of the methods in 6.12.
5. Physical Requirements
5.1 Length and Width—The actual length shall not be less than ⁄4 in. (6.4 mm) of the nominal length and the actual width shall
be within 6 ⁄8 in. (3.2 mm) of the nominal width when measured in accordance with 6.3 and 6.4.
5.2 Thickness—The minimum thickness of the soffit shall be 0.030 in. (0.8 mm) when measured in accordance with 6.5.
The last approved version of this historical standard is referenced on www.astm.org.
D4477 − 24
5.3 Camber—A full length of soffit, typically 10 or 12 ft (3.05 or 3.66 m), will not have a camber greater than ⁄8 in. (3.2 mm)
when measured in accordance with 6.6.
5.4 Initial Impact Resistance—The soffit shall have a minimum impact strength of 45 in.·lbf (5.34 J) when tested in accordance
with 6.7.
−5
5.5 Coeffıcient of Linear Expansion—The soffit shall have a coefficient of linear expansion not greater than 4.5 by 10 in./in./°F
−5
(8.1 by 10 mm/mm/°C) when tested in accordance with 6.8.
5.6 Gloss—This requirement is not applicable to surface ventilated soffit. The gloss of soffit shall be uniform across the exposed
face. The average of all readings for a panel determined in 6.9.1.2 shall not differ from the manufacturer’s specified gloss value
more than the permitted variation in Table 1, and each individual reading shall not vary more than 10 points from the average.
Gloss shall be tested in accordance with 6.9.
TABLE 1
Manufacturer’s Permitted difference
Specified Gloss Value from
Mfg. Spec. Gloss
Value
Less than or equal to 35 ±8
Greater than 35 ±10
5.7 Deflection of the soffit shall not exceed 6 ⁄8 in. (3.2 mm) when installed flat in a horizontal position over a span of 24 in. (610
mm) without intermittent support when tested in accordance with 6.11.
5.8 Uniformity of Color—When tested in accordance with 6.10, the total color change, E, between
...
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