ASTM E2396-05

Standard Test Method for Saturated Water Permeability of Granular Drainage Media [Falling-Head Method] for Green Roof Systems

SIGNIFICANCE AND USE
This test method addresses performance characteristics for green roof systems with respect to the water permeability of the drainage media.
5.1.1 Water permeability of coarse materials is highly influenced by the head conditions under which it is measured. In green roofs, coarse materials are frequently used to create drainage zones for percolated rainfall.
5.1.2 This test method is intended to provide water permeability data that is relevant to this design condition that is characterized by horizontal flow under low-head. This will also allow the performance of granular drainage layers in green roof systems to be compared directly to alternative components, such as geocomposite drain layers.
Determining the performance characteristics of 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.
Determining the performance characteristics of green roof systems provides information to facilitate assessment of the performance of one green roof system relative to another.
SCOPE
1.1 This test method covers a procedure for determining the water permeability of coarse granular materials used in the drainage layers of green roof systems.
1.2 This test method addresses water permeability under the low-head conditions that typify horizontal flow in green roof applications.
1.3 This test method is suitable for coarse-grained materials with 100 % of the material retained on the U.S. #8 (2.25 mm) sieve. It is not suitable for finer-grained 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.

General Information

• Status: Historical
• Publication Date: 14-Aug-2005
• ICS: 65.020.20 - Plant growing
• ICS: 91.060.20 - Roofs
• Technical Committee: E60 - Sustainability
• Drafting Committee: E60.01 - Buildings and Construction

Relations

• Replaced By: ASTM E2396-11 - Standard Test Method for Saturated Water Permeability of Granular Drainage Media [Falling-Head Method] for Vegetative (Green) Roof Systems
• Effective Date: 15-Feb-2011

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E2396–05
Standard Test Method for
Saturated Water Permeability of Granular Drainage Media
1
[Falling-Head Method] for Green Roof Systems
This standard is issued under the fixed designation E2396; 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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 For terms related to building construction, refer to
Terminology E631.
1.1 This test method covers a procedure for determining the
3.1.2 For terms related to sustainability relative to the
water permeability of coarse granular materials used in the
performance of buildings, refer to Terminology E2114.
drainage layers of green roof systems.
3.2 Definitions of Terms Specific to This Standard:
1.2 This test method addresses water permeability under the
3.2.1 water permeability—the coefficient which when mul-
low-head conditions that typify horizontal flow in green roof
tiplied by the hydraulic gradient will yield the apparent
applications.
velocity with which water (at 68°F) will move through a
1.3 This test method is suitable for coarse-grained materials
cross-section of media.
with 100 % of the material retained on the U.S. #8 (2.25 mm)
3.2.2 wet density—the density of coarse granular drainage
sieve. It is not suitable for finer-grained materials.
course materials determined after immersion for 24 hours.
1.4 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4. Summary of Test Method
conversions to SI units that are provided for information only
4.1 Thisprocedureinvolvesmeasuringthewaterpermeabil-
and are not considered standard.
ity of coarse granular materials under the low-head conditions
1.5 This standard does not purport to address all of the
that characterize the environment in green roof systems. A
safety concerns, if any, associated with its use. It is the
falling-head technique is used. Incidental to the procedure is
responsibility of the user of this standard to establish appro-
the measurement of the wet density of the medium.
priate safety and health practices and to determine the
applicability of regulatory limitations prior to use.
5. Significance and Use
5.1 This test method addresses performance characteristics
2. Referenced Documents
2 forgreenroofsystemswithrespecttothewaterpermeabilityof
2.1 ASTM Standards:
the drainage media.
C29/C29M Test Method for Bulk Density (“Unit Weight”)
5.1.1 Water permeability of coarse materials is highly influ-
and Voids in Aggregate
enced by the head conditions under which it is measured. In
C130 Specification for Lightweight Aggregates for Con-
3 green roofs, coarse materials are frequently used to create
crete
drainage zones for percolated rainfall.
E631 Terminology of Building Constructions
5.1.2 This test method is intended to provide water perme-
E2114 Terminology for Sustainability Relative to the Per-
ability data that is relevant to this design condition that is
formance of Buildings
characterizedbyhorizontalflowunderlow-head.Thiswillalso
3. Terminology allowtheperformanceofgranulardrainagelayersingreenroof
systems to be compared directly to alternative components,
3.1 Definitions:
such as geocomposite drain layers.
5.2 Determining the performance characteristics of green
1
This test method is under the jurisdiction of ASTM Committee E60 on
roof systems provides information to facilitate the assessment
Sustainability and is the direct responsibility of Subcommittee E60.01 on Buildings
and Construction. of related engineering aspects of the facility. Such aspects may
Current edition approvedAug. 15, 2005. PublishedAugust 2005. DOI: 10.1520/
includestructuraldesignrequirements,mechanicalengineering
E2396-05.
and thermal design requirements, and fire and life safety
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
requirements.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
5.3 Determining the performance characteristics of green
the ASTM website.
roof systems provides information to facilitate assessment of
3
Withdrawn. The last approved version of this historical standard is referenced
the performance of one green roof system relative to another.
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E2396–05
6. Apparatus the measured volume of the granular medium in the beaker,
3
compute the wet density of the medium in units of lb/ft (kg/
6.1 The appara
...