ASTM E2398-11
(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
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.
Accurate information about the water and media holding capacity of geocomposite drain layers is essential to predict dead load for vegetative (green) roof systems.
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.
Water capture is also useful in assessing irrigation requirements for vegetative (green) roof designs.
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 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 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 − 11
StandardTest 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; 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 3.1.2 For terms related to sustainability relative to the
performance of buildings, refer to Terminology E2114.
1.1 This test method covers the determination of the water
3.2 Definitions of Terms Specific to This Standard:
and media retention of synthetic drains layers used in vegeta-
3.2.1 captured water, n—the quantity of water that is re-
tive (green) roof systems.
tained in the drainage layer of a vegetative (green) roof system
1.2 This test method is applicable to geocomposite drain
after new water additions have ceased and that cannot escape
layers that retain water and media in cup-like receptacles on
the roof except through evaporation or plant transpiration.
their upper surface. Examples include shaped plastic mem-
branes and closed-cell plastic foam boards 3.2.2 coupon, n—a portion of a material or laboratory
sample from which multiple specimens can be taken for
1.3 This test method does not apply to products manufac-
testing.
tured from water-absorptive materials.
3.2.3 geocomposite drain layer, n—asyntheticsheet,mat,or
1.4 The values stated in inch-pound units are to be regarded
panel that is specifically designed to convey water horizontally
as standard. The values given in parentheses are mathematical
toward the roof deck drains, gutters, or scuppers.
conversions to SI units that are provided for information only
3.2.3.1 Discussion—Geocomposite drainage layers include
and are not considered standard.
absorptive drainage mats whose principle function is drainage,
1.5 This standard does not purport to address all of the
but which will also contribute to water retention (see retained
safety concerns, if any, associated with its use. It is the
water). Some geocomposite drainage layers may incorporate
responsibility of the user of this standard to establish appro-
receptacles on their upper surfaces that will capture water (see
priate safety and health practices and to determine the
captured water).
applicability of regulatory limitations prior to use.
3.2.4 retained water, n—the quantity of water that will be
2. Referenced Documents
retained for a prolonged period against gravity drainage in a
2
2.1 ASTM Standards:
vegetative (green) roof system, or in one of its components,
E631 Terminology of Building Constructions
after new additions by rainfall or artificial irrigation have
E2114 Terminology for Sustainability Relative to the Perfor-
ceased.
mance of Buildings
3.2.4.1 Discussion—Most of this water will not become
E2397 Practice for Determination of Dead Loads and Live
runoff but will be used to the plant-mediated processes of
Loads Associated with Vegetative (Green) Roof Systems
evapo-transpiration.
3 2
3. Terminology 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
3.1 Definitions:
the upper most asperities of the geocomposite drain layer.
3.1.1 For terms related to building construction, refer to
Terminology E631.
3.2.6 unit water capture volume, n—the maximum volume
3 2 3 2
ofwater,ft /ft (cm /cm ),thatageocompositedrainlayercan
1
hold at a specified inclination.
This test method is under the jurisdiction ofASTM Committee D08 on Roofing
and Waterproofing and is the direct responsibility of Subcommittee D08.24 on
3.2.6.1 Discussion—For vegetative (green) roofs systems
Sustainability.
where the geocomposite drain layer will be filled with granular
Current edition approved Feb. 15, 2011. Published March 2011. Originally
drainage medium, the actual volume is assumed to be 25 % of
approved in 2005. Last previous edition approved in 2005 as E2398 – 05. DOI:
10.1520/E2398-11.
the measured volume. This assumption will allow a direct
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
comparison between geocomposite sheet drains without, re-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
gard to the granular drainage media used. In computing the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. actualwatercaptureofageocompositesheetdrainemployedin
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E2398 − 11
a specific vegetative (green) roof assem
...
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:E2398–05 Designation:E2398–11
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; 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 standard 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 standardtest method does not apply to products manufactured from water-absorptive materials.
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 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:
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
1
This test method is under the jurisdiction of ASTM Committee E60 on Sustainability and is the direct responsibility of Subcommittee E60.01 on Buildings and
Construction.
Current edition approved Aug. 15, 2005. Published August 2005. DOI: 10.1520/E2398-05.
Current edition approved Feb. 15, 2011. Published March 2011. Originally approved in 2005. Last previous edition approved in 2005 as E2398 – 05. DOI:
10.1520/E2398-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
1
---------------------- Page: 1 ----------------------
E2398–11
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.
3.2.3.1 Discussion—Geocomposite drainage layers include absorptive drainage mats whose principle function is drainage, but
which will also 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
3 2 (cm 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 3
—the maximum volume of water, ft 2 (cm 2
3.2.6 unit water capture volume, n—the maximum volume of water (ft /ft )(cm /cm ), that a
geocomposite drain layer can hold at a specified inclination.
3.
...
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