ASTM E2397-05
(Practice)Standard Practice for Determination of Dead Loads and Live Loads associated with Green Roof Systems
Standard Practice for Determination of Dead Loads and Live Loads associated with Green Roof Systems
SIGNIFICANCE AND USE
This practice addresses performance characteristics for green roof systems with respect to the dead load and transient water live load of the entire system.
Determining these 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 these 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 practice covers a standardized procedure for predicting the system weight of a green roof system.
1.2 The procedure addresses the loads associated with green roof systems. Components that are typically encountered in green roof systems include: membranes, non-absorptive plastic sheet components, metallic layers, fabrics, geocomposite drain layers, synthetic reinforcing layers, cover/recover boards, insulation materials, growth media, granular drainage media, and plant materials.
1.3 This procedure also addresses the weight of the green roof system under two conditions: (1) weight under drained conditions after new water additions by rainfall or irrigation have ceased (this includes the weight of retained water and captured water), and (2) weight when rainfall or irrigation is actively occurring and the drainage layer is completely filled with water. The first condition is considered the dead load of the green roof system. The difference in weight between the first and second conditions, approximated by the weight of transient waterin the drainage layer, is considered a live load.
1.4 This procedure does not address point or line loads associated with architectural elements that are not essential components of a particular green roof system. These architectural elements may include pavement, walls, and masonry, and so forth.
1.5 This procedure does not address live loads associated with construction activities.
1.6 This procedure does not address live loads associated with snow or wind.
1.7 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.
1.8 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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Standards Content (Sample)
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Designation:E2397–05
Standard Practice for
Determination of Dead Loads and Live Loads associated
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with Green Roof Systems
This standard is issued under the fixed designation E2397; 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 priate safety and health practices and to determine the
applicability of regulatory limitations prior to use.
1.1 This practice covers a standardized procedure for pre-
dicting the system weight of a green roof system.
2. Referenced Documents
1.2 The procedure addresses the loads associated with green
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2.1 ASTM Standards:
roof systems. Components that are typically encountered in
C29/C29M Test Method for Bulk Density (“Unit Weight”)
green roof systems include: membranes, non-absorptive plastic
and Voids in Aggregate
sheet components, metallic layers, fabrics, geocomposite drain
E631 Terminology of Building Constructions
layers, synthetic reinforcing layers, cover/recover boards, in-
E2114 Terminology for Sustainability Relative to the Per-
sulation materials, growth media, granular drainage media, and
formance of Buildings
plant materials.
E2396 Test Method for Saturated Water Permeability of
1.3 This procedure also addresses the weight of the green
Granular Drainage Media [Falling-Head Method] for
roof system under two conditions: (1) weight under drained
Green Roof Systems
conditions after new water additions by rainfall or irrigation
E2398 Test Method forWater Capture and Media Retention
have ceased (this includes the weight of retained water and
of Geocomposite Drain Layers for Green Roof Systems
captured water), and (2) weight when rainfall or irrigation is
E2399 Test Method for Maximum Media Density for Dead
actively occurring and the drainage layer is completely filled
Load Analysis of Green Roof Systems
with water. The first condition is considered the dead load of
the green roof system. The difference in weight between the
3. Terminology
first and second conditions, approximated by the weight of
3.1 Definitions:
transient water in the drainage layer, is considered a live
3.1.1 For terms related to building construction, refer to
load.
Terminology E631.
1.4 This procedure does not address point or line loads
3.1.2 For terms related to sustainability relative to the
associated with architectural elements that are not essential
performance of buildings, refer to Terminology E2114.
components of a particular green roof system. These architec-
3.2 Definitions of Terms Specific to This Standard:
tural elements may include pavement, walls, and masonry, and
3.2.1 captured water, n—the quantity of water that is
so forth.
retained in the drainage layer of a green roof system after new
1.5 This procedure does not address live loads associated
water additions have ceased and that cannot escape the roof
with construction activities.
except through evaporation or plant transpiration.
1.6 This procedure does not address live loads associated
3.2.1.1 Discussion—Water capture is a design technique for
with snow or wind.
enhancing the water holding properties of a green roof system.
1.7 The values stated in inch-pound units are to be regarded
Water may be captured using a number of techniques, includ-
as standard. The values given in parentheses are mathematical
ing receptacles built into a geocomposite drain layer, trays, and
conversions to SI units that are provided for information only
restricting drainage in order to hold water within the drainage
and are not considered standard.
layer.
1.8 This standard does not purport to address all of the
In some green roof systems a granular course at the bottom
safety concerns, if any, associated with its use. It is the
of the system provides both drainage and water capture
responsibility of the user of this standard to establish appro-
functions. In this case the captured water applies only to the
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This Practice is under the jurisdiction of ASTM Committee E60 on Sustain-
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ability and is the direct responsibility of Subcommittee E60.01 on Buildings and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Construction. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approvedAug. 15, 2005. PublishedAugust 2005. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
E2397-05. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E2397–05
thickness of the granular course for which drainage is re
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