ASTM E2925-19a

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Designation: E2925 − 19 E2925 − 19a
Standard Specification for
Manufactured Polymeric Drainage and Ventilation Materials
Used to Provide a Rainscreen Function
This standard is issued under the fixed designation E2925; 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
1.1 This specification is applicable to manufactured polymeric materials used to provide a rainscreen function, a means for the
drainage of liquid moisture and the ventilation of vapor moisture that enters an above-grade exterior wall assembly. Rainscreen
materials that comply with this specification are intended to be used behind exterior cladding products and intended to cover one
hundred percent (100 %) of the wall area that is designed to provide a rainscreen function to resist water infiltration.
1.2 This specification addresses the following types of rainscreen materials:
1.2.1 Type A—entangled mesh materials.
1.2.2 Type B—formed/textured sheet material.
1.2.3 Type C—formed battens.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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:
C578 Specification for Rigid, Cellular Polystyrene Thermal Insulation
C1338 Test Method for Determining Fungi Resistance of Insulation Materials and Facings
D3045 Practice for Heat Aging of Plastics Without Load
D5199 Test Method for Measuring the Nominal Thickness of Geosynthetics
D5322 Practice for Laboratory Immersion Procedures for Evaluating the Chemical Resistance of Geosynthetics to Liquids
D6108 Test Method for Compressive Properties of Plastic Lumber and Shapes
D6364 Test Method for Determining Short-Term Compression Behavior of Geosynthetics
E84 Test Method for Surface Burning Characteristics of Building Materials
E283E283/E283M Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors
Under Specified Pressure Differences Across the Specimen
E631 Terminology of Building Constructions
E2273 Test Method for Determining the Drainage Efficiency of Exterior Insulation and Finish Systems (EIFS) Clad Wall
Assemblies
G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
2.2 Other Standard:
CAN/CGSB 51.33-M89 Vapor Barrier Sheet, Excluding Polyethylene, for Use in Building Construction
This specification is under the jurisdiction of ASTM Committee E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.55 on Performance
of Building Enclosures.
Current edition approved July 1, 2019Aug. 1, 2019. Published August 2019. Originally approved in 2014. Last previous edition approved in 20172019 as E2925–17.–19.
DOI: 10.1520/E2925–19.10.1520/E2925–19A.
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.
Available from Standards Council of Canada, 600-55 Metcalfe Street Ottawa, ON K1P 6L5, Canada, https://www.scc.ca/.
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E2925 − 19a
3. Terminology
3.1 Definitions—For definitions of general terms related to building construction used in this specification, refer to Terminology
E631.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 capillary action, v—liquid water movement against gravity induced by the force of molecular attraction (surface tension)
between the water and the material it contacts, facilitated by a small gap between materials.
3.2.2 exterior cladding, n—weather-exposed materials of a wall assembly including but not limited to siding, stucco, masonry
veneer, but excluding fenestration (doors and windows).
3.2.3 mortar screen, n—layer of material designed to prevent mortar from entering the drainage space.
3.2.4 polymeric, n—materials composed primarily of polymers.
3.2.5 polymeric rainscreen material, n—material intended to be installed behind exterior cladding products which creates a
drainage and ventilation space for liquid and vapor moisture that enters an above-grade exterior wall assembly reducing water
transfer to the water resistive barrier (WRB).
3.2.6 rainscreen space, n—separation behind the cladding in the wall assembly intended to inhibit capillary action and moisture
bridging as well as to promote ventilation and the drainage of moisture.
3.2.7 water-resistive barrier (WRB), n—material that is intended to resist liquid water that has penetrated the cladding system.
4. Classification
4.1 Type A—entangled mesh materials.
4.2 Type B—formed/textured sheet material.
4.3 Type C—formed battens.
5. Materials and Manufacture
5.1 Description of the material composition and structure shall be made available upon request.
5.1.1 Descriptions of the materials shall include roll or package weight and dimensions.
5.1.2 Descriptions of the material composition shall include linear density (basis weight).
5.1.3 All materials claiming compliance with this specification shall be described in such statements as described in all
applicable test reports.
6. Material Properties
6.1 Ventilation/Airflow Test:
6.1.1 The airflow rate shall be measured in accordance with Annex A1.
6.2 Drainage Test:
6.2.1 The drainage test shall be conducted in accordance with Annex A2.
6.3 Thickness Test:
6.3.1 The thickness shall be measured in accordance with Test Method D5199 at 0.20 kPa.
6.4 Compression Test:
6.4.1 The compressive strength for Type A and B shall be determined in accordance with Test Method D6364 at 10 %
compression and at full yield (if yield occurs).
6.4.2 The compressive strength for Type C shall be determined in accordance with Test Method D6108.
6.5 UV Exposure Test:
6.5.1 The test specimens shall be exposed in accordance with Practice G154 following Cycle 1 for 336 h.
6.5.2 After the UV exposure test has been completed, the compression test (6.4) shall be repeated.
6.6 Heat Aging:
6.6.1 The test specimens shall be heat aged in accordance with Practice D3045 at a temperature of (77 6 3) °C for 90 days.
6.6.2 After the heat aging test has been completed, the thickness test (6.3) and the compression test (6.4) shall be repeated.
6.7 Mold and Fungi Resistance:
6.7.1 The specimens shall be tested in accordance with Test Method C1338 for 28 days exposure.
6.8 Water Exposure:
6.8.1 The specimens with dimensions (250 6 2) mm by (250 6 2) mm shall be immersed in water in accordance with Practice
D5322 using tap water at (50 6 2) °C for 168 h.
6.8.2 After the water exposure test has been completed and within one hour of removal from the water, the compression test
(6.4) shall be repeated.
E2925 − 19a
6.9 Flame Spread Test (Optional):
6.9.1 When desired, the material shall be tested in accordance with Test Method E84 for flame spread.
6.10 Freeze-Thaw (Optional):
6.10.1 The freeze-thaw exposure shall be conducted in accordance with the aging procedure of Section 8.3.2.1 of CAN/CGSB
51.33-M89.
6.10.2 After the freeze thaw exposure test has been completed and within one hour of the completion of the test, the
compression test (6.4) shall be repeated.
7. Material Performance Requirements
7.1 All materials shall provide the minimum performance requirements listed in Table 1.
8. Sampling
8.1 The material to be tested for conformance to this specification shall be taken directly from a randomly selected roll or
package which is representative of the commercial product.
TABLE 1 Material Performance Requirements
Performance
Test Method Units Requirements
Minimum
Ventilation/Airflow 3.1 L/s Declare
Drainage 3.2 % Declare
Thickness 3.3 mm 5
Compression Strength 3.4 kPa Declare
UV Exposure 3.5 % 80 % of the
compression
strength
before UV
exposure
Heat Aging 3.6 % 80 % of the
compression
strength
before heat
aging
Mold/Fungal Growth 3.7 visual no visible mold
or fungi growth
on the test
specimens
Water Exposure 3.8 % 80 % of the
compression
strength
before water
exposure
Optional Tests
Flame Spread 3.9 . Declare
Freeze/Thaw 3.10 . 80 % of the
compression
strength
before freeze
thaw
TABLE 1 Material Performance Requirements
Performance Requirements
Test Method Units Min/Max
Ventilation/Airflow at 10 Pa 3.1 L/s Min 0.10
Pressure Difference
Drainage 3.2 % Min 90
Thickness 3.3 mm Min 5
Compression Strength 3.4 kPa Min 20
UV Exposure 3.5 kPa Min The compression strength
after UV exposure shall not be less than 80 %
Heat Aging 3.6 kPa Min The compression strength
after heat aging shall not be less than 80 %
Mold/Fungal Growth 3.7 visual Max No visual mold or fungal growth
on the test specimens
Water Exposure 3.8 kPa Min The compression strength
after water exposure shall not be less than 80 %
Flame Spread 3.9 . Max 25
Smoke-Developed 3.9 . Max 450
Freeze/Thaw 3.10 kPa Min The compression strength
after freeze-thaw shall not be less than 80 %
E2925 − 19a
9. Specimen Preparation
9.1 The specimens from roll materials shall be cut from the interior of the sample roll so that no specimen edge is nearer than
75 mm to the original roll edge.
9.2 Unless otherwise stated in the test method, all specimens shall be conditioned for a minimum period of 40 h at (23 6 2) °C
and (50 6 10) % relative humidity (RH).
9.3 The specimen size shall be determined by the test method.
9.4 If not otherwise specified in the referenced test method, a minimum of five specimens shall be tested and each specimen
shall meet the minimum performance requirements.
10. Reporting Requirements
10.1 Report required and declared test data in the form of a table(s) with property, result and pass/fail status including results
for all properties tested.
10.2 In addition to the information specified in the individual test methods, all reports describing the testing of the material in
accordance with the specification shall include the following information:
10.2.1 date test conducted;
10.2.2 manufacturer’s name, address, production facility address and product designation;
10.2.3 type and name of the material and other material description;
10.2.4 description of the material composition and structure;
10.2.5 lot number and manufactured date;
10.2.6 expiration date; if applicable;
10.2.7 material sampling procedure used;
10.2.8 description of test apparatus, calibration standards used and their source;
10.2.9 name and location of laboratory performing the tests and the accreditation agency for the laboratory;
10.2.10 description of the specimen preparation;
10.2.11 size of specimens used for each test (length, width (or diameter) and thickness);
10.2.12 declaration of conformity with this specification;
10.2.13 if the standard requirements were modified, a statement in the test report and a complete description of the
modifications;
10.2.14 results of drainage test shall be reported as the percentage and weight of water drained from the test wall assembly (with
and without insect screen), and the percentage and weight of the water retained in the test wall assembly;
10.2.15 the compression test results shall provide the complete compression curve;
10.2.16 the compression test values shall be reported at 10 % compression and at yield for each sample, and the average values
shall be calculated;
10.2.17 the flame spread test results shall include the flame spread rating and smoke developed index;
11. Marking and Labeling
11.1 The material shall be marked or labeled with manufacturer name and product name.
12. Packaging and Package Marking
12.1 The information on the material or packaging shall incl
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