ASTM E2398/E2398M-15a
(Test Method)Standard Test Method for Water Capture and Media Retention of Geocomposite Drain Layers for Vegetative (Green) Roof Systems
Standard Test Method for Water Capture and Media Retention of Geocomposite Drain Layers for Vegetative (Green) Roof Systems
SIGNIFICANCE AND USE
5.1 Determining these performance characteristics of vegetative (green) roof systems provides information to facilitate the assessment of related engineering aspects of the facility. Such aspects may include structural design requirements, mechanical engineering and thermal design requirements, and fire and life safety requirements.
5.1.1 Accurate information about the water and media holding capacity of geocomposite drain layers is essential to predict dead load for vegetative (green) roof systems.
5.2 Determining these performance characteristics of vegetative (green) roof systems provides information to facilitate assessment of the performance of one vegetative (green) roof system relative to one another.
5.2.1 Water capture is also useful in assessing irrigation requirements for vegetative (green) roof designs.
5.2.2 Information about the unit media retention volume is required to predict the quantity of material that will be required to construct a vegetative (green) roof with a specified total thickness.
SCOPE
1.1 This test method covers the determination of the water and media retention of synthetic drains layers used in vegetative (green) roof systems.
1.2 This test method is applicable to geocomposite drain layers that retain water and media in cup-like receptacles on their upper surface. Examples include shaped plastic membranes and closed-cell plastic foam boards.
1.3 This test method does not apply to products manufactured from water-absorptive materials.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 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 and health practices and to determine the applicability of regulatory limitations prior to use.
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Designation: E2398/E2398M − 15a
Standard Test Method for
Water Capture and Media Retention of Geocomposite Drain
1
Layers for Vegetative (Green) Roof Systems
ThisstandardisissuedunderthefixeddesignationE2398/E2398M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 3. Terminology
3.1 Definitions:
1.1 This test method covers the determination of the water
3.1.1 For terms related to building construction, refer to
and media retention of synthetic drains layers used in vegeta-
tive (green) roof systems. Terminology E631.
3.1.2 For terms related to sustainability relative to the
1.2 This test method is applicable to geocomposite drain
performance of buildings, refer to Terminology E2114.
layers that retain water and media in cup-like receptacles on
3.2 Definitions of Terms Specific to This Standard:
their upper surface. Examples include shaped plastic mem-
3.2.1 captured water, n—the quantity of water that is re-
branes and closed-cell plastic foam boards.
tained in the drainage layer of a vegetative (green) roof system
1.3 This test method does not apply to products manufac-
after new water additions have ceased and that cannot escape
tured from water-absorptive materials.
the roof except through evaporation or plant transpiration.
1.4 The values stated in either SI units or inch-pound units 3.2.2 coupon, n—a portion of a material or laboratory
are to be regarded separately as standard. The values stated in sample from which multiple specimens can be taken for
each system may not be exact equivalents; therefore, each testing.
system shall be used independently of the other. Combining
3.2.3 geocomposite drain layer, n—asyntheticsheet,mat,or
values from the two systems may result in non-conformance
panel that is specifically designed to convey water horizontally
with the standard.
toward the roof deck drains, gutters, or scuppers.
1.5 This standard does not purport to address all of the 3.2.3.1 Discussion—Geocomposite drainage layers include
safety concerns, if any, associated with its use. It is the absorptive drainage mats whose principle function is drainage,
responsibility of the user of this standard to establish appro- but which will also contribute to water retention (see retained
priate safety and health practices and to determine the water). Some geocomposite drainage layers may incorporate
applicability of regulatory limitations prior to use. receptacles on their upper surfaces that will capture water (see
captured water).
2. Referenced Documents
3.2.4 retained water, n—the quantity of water that will be
2
retained for a prolonged period against gravity drainage in a
2.1 ASTM Standards:
vegetative (green) roof system, or in one of its components,
C920 Specification for Elastomeric Joint Sealants
after new additions by rainfall or artificial irrigation have
E631 Terminology of Building Constructions
ceased.
E2114 Terminology for Sustainability Relative to the Perfor-
3.2.4.1 Discussion—Most of this water will not become
mance of Buildings
runoff but will be used to the plant-mediated processes of
E2397 Practice for Determination of Dead Loads and Live
evapo-transpiration.
Loads Associated with Vegetative (Green) Roof Systems
3 2
3.2.5 unit media retention volume, n—the volume, ft /ft
3 2
[cm /cm ], that is required to fill a geocomposite drain layer to
the upper most asperities of the geocomposite drain layer.
1
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
and Waterproofing and is the direct responsibility of Subcommittee D08.24 on
3.2.6 unit water capture volume, n—the maximum volume
Sustainability.
3 2 3 2
of water, ft /ft [cm /cm ], that a geocomposite drain layer can
Current edition approved Nov. 1, 2015. Published December 2015. Originally
hold at a specified inclination.
approved in 2005. Last previous edition approved in 2015 as E2398/E2398M – 15.
DOI: 10.1520/E2398_E2398M-15A.
3.2.6.1 Discussion—For vegetative (green) roofs systems
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
where the geocomposite drain layer will be filled with granular
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
drainage medium, the actual volume is assumed to be 25 % of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the measured volume. This assumption will allow a direct
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E2398/E2398M − 15a
comparison between geocompos
...
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: E2398/E2398M − 15 E2398/E2398M − 15a
Standard Test Method for
Water Capture and Media Retention of Geocomposite Drain
1
Layers for Vegetative (Green) Roof Systems
This standard is issued under the fixed designation E2398/E2398M; 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 test method covers the determination of the water and media retention of synthetic drains layers used in vegetative
(green) roof systems.
1.2 This test method is applicable to geocomposite drain layers that retain water and media in cup-like receptacles on their upper
surface. Examples include shaped plastic membranes and closed-cell plastic foam boards.
1.3 This test method does not apply to products manufactured from water-absorptive materials.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.5 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 and health practices and to determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C920 Specification for Elastomeric Joint Sealants
E631 Terminology of Building Constructions
E2114 Terminology for Sustainability Relative to the Performance of Buildings
E2397 Practice for Determination of Dead Loads and Live Loads Associated with Vegetative (Green) Roof Systems
3. Terminology
3.1 Definitions:
3.1.1 For terms related to building construction, refer to Terminology E631.
3.1.2 For terms related to sustainability relative to the performance of buildings, refer to Terminology E2114.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 captured water, n—the quantity of water that is retained in the drainage layer of a vegetative (green) roof system after new
water additions have ceased and that cannot escape the roof except through evaporation or plant transpiration.
3.2.2 coupon, n—a portion of a material or laboratory sample from which multiple specimens can be taken for testing.
3.2.3 geocomposite drain layer, n—a synthetic sheet, mat, or panel that is specifically designed to convey water horizontally
toward the roof deck drains, gutters, or scuppers.
1
This test method is under the jurisdiction of ASTM Committee D08 on Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.24 on
Sustainability.
Current edition approved June 1, 2015Nov. 1, 2015. Published July 2015December 2015. Originally approved in 2005. Last previous edition approved in 20112015 as
E2398 – 11.E2398/E2398M – 15. DOI: 10.1520/E2398_E2398M-15.10.1520/E2398_E2398M-15A.
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.
3.2.3.1 Discussion—
Geocomposite drainage layers include absorptive drainage mats whose principle function is drainage, but which will also
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E2398/E2398M − 15a
contribute to water retention (see retained water). Some geocomposite drainage layers may incorporate receptacles on their upper
surfaces that will capture water (see captured water).
3.2.4 retained water, n—the quantity of water that will be retained for a prolonged period against gravity drainage in a vegetative
(green) roof system, or in one of its components, after new additions by rainfall or artificial irrigation have ceased.
3.2.4.1 Discussion—
Most of this water will not become runoff but will be used to the plant-mediated processes of evapo-transpiration.
3 2 3 2
3.2.5 unit media retention volume, n—the volume, ft /ft [cm /cm ], that is required to fill a geocomposite drain layer to the
upper most asperities of the geocomposite drain layer.
3 2 3 2
3.2.6 unit water capture volume, n—the maximu
...
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