ASTM E661-03(2009)
(Test Method)Standard Test Method for Performance of Wood and Wood-Based Floor and Roof Sheathing Under Concentrated Static and Impact Loads
Standard Test Method for Performance of Wood and Wood-Based Floor and Roof Sheathing Under Concentrated Static and Impact Loads
SIGNIFICANCE AND USE
The procedures outlined will provide data that can be used to evaluate the structural performance, under concentrated loads, of roof and floor sheathing, separate from the effects of the framing, under simulated conditions representative of those in actual service.
The procedures are intended to be applied to roof or floor sheathing materials installed directly to framing. They are not intended for the evaluation of the framed assembly as a whole.
SCOPE
1.1 This test method covers procedures for determining the resistance to deflection and damage of floor and roof sheathing used in site-built construction subjected to concentrated static loads as well as impact loads from nonrigid blunt objects. It is applicable to wood and wood-based panels and boards, but is not intended to cover profiled metal decks, nor precast or cast-in-place slabs. Surface indentation is not evaluated separately from deflection.
1.2 Three applications are covered: roof sheathing, subfloors, and single floors. Roof sheathing is tested in both a dry and a wet condition, while subfloors and single floors are both tested in a dry condition, as well as a condition of having dried out after being wet. These moisture conditions are those commonly experienced with site-built construction.
Note 1—Where it is anticipated that sheathing will be subjected only to dry conditions during construction and use, or else to greater moisture exposure than is indicated in 7.3.2, the corresponding exposure conditions may be modified by agreement between the interested parties. For example, shop-built construction may be tested dry only, although the possibility of exposure to high humidity or leaks and flooding during use should be considered.
1.3 The values stated in metric (SI) units are to be regarded as the 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E661 − 03 (Reapproved2009)
Standard Test Method for
Performance of Wood and Wood-Based Floor and Roof
Sheathing Under Concentrated Static and Impact Loads
This standard is issued under the fixed designation E661; 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.
INTRODUCTION
During construction and occupancy of a building, floor and roof sheathing are subjected to
concentrated loads that frequently govern the thickness required. Static loads may simulate either foot
traffic, or loads from fixtures, when applied through loading disks of appropriate size. Impact loads
will occur during construction and also in service.
Roof sheathing and subflooring are likely to be critical in strength or stiffness, or both, under foot
traffic and construction loads, while single-layer floors are generally critical under fixture loads, foot
traffic, and in-service impact loads. Subfloors, like single floors, must also support fixture loads, but
they will have an additional layer of material, such as underlayment above, which will help to
distribute concentrated loads.
1. Scope 1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers procedures for determining the
responsibility of the user of this standard to establish appro-
resistance to deflection and damage of floor and roof sheathing
priate safety and health practices and determine the applica-
used in site-built construction subjected to concentrated static
bility of regulatory limitations prior to use.
loads as well as impact loads from nonrigid blunt objects. It is
applicable to wood and wood-based panels and boards, but is
2. Referenced Documents
not intended to cover profiled metal decks, nor precast or
cast-in-place slabs. Surface indentation is not evaluated sepa- 2.1 ASTM Standards:
D1517 Terminology Relating to Leather
rately from deflection.
E575 Practice for Reporting Data from Structural Tests of
1.2 Three applications are covered: roof sheathing,
Building Constructions, Elements, Connections, and As-
subfloors, and single floors. Roof sheathing is tested in both a
semblies
dry and a wet condition, while subfloors and single floors are
E631 Terminology of Building Constructions
both tested in a dry condition, as well as a condition of having
2.2 Other Standards:
dried out after being wet. These moisture conditions are those
Fed. Spec. V-T-291E(1) Linen Thread
commonly experienced with site-built construction.
NOTE1—Whereitisanticipatedthatsheathingwillbesubjectedonlyto
3. Terminology
dry conditions during construction and use, or else to greater moisture
exposure than is indicated in 7.3.2, the corresponding exposure conditions
3.1 SeeTerminologyE631fortermsrelatedtothisstandard.
may be modified by agreement between the interested parties. For
example, shop-built construction may be tested dry only, although the
4. Summary of Test Method
possibility of exposure to high humidity or leaks and flooding during use
should be considered.
4.1 Roof and floor sheathing specimens are subjected to
concentrated loads applied through a 76-mm (3-in.) or a
1.3 The values stated in metric (SI) units are to be regarded
as the standard.
1 2
This test method is under the jurisdiction of ASTM Committee E06 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Performance of Buildings and is the direct responsibility of Subcommittee E06.11 contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
on Horizontal and Vertical Structures/Structural Performance of Completed Struc- Standards volume information, refer to the standard’s Document Summary page on
tures. the ASTM website.
Current edition approved April 1, 2009. Published May 2009. Originally Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
approved in 1978. Last previous edition approved in 2003 as E661 – 03. DOI: Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
10.1520/E0661-03R09. www.dodssp.daps.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E661 − 03 (2009)
25-mm (1-in.) diameter loading disk, depending on the in- 6. Apparatus
tended use and the properties to be evaluated. They are also
6.1 Concentrated Load—The apparatus for the concentrated
subjectedtotheimpactofashot-filleddropbag.Specimensare
load test shall conform to the following requirements (see Fig.
tested in a horizontal position, mounted on fully supported
1):
framingmembersandwithloadsappliedtothetopsurfacenear
6.1.1 Supports—Theframingmembersshallbesupportedin
anedge,oratalocationdeterminedtobemorevulnerable.Any
ordernottodeflectundertheappliedloads.Thesupportsystem
support framing may be used that is representative of the
shall include provisions for rigidly restraining the ends of the
anticipated service, as the framing is not considered a major
framing members, as with blocking and clamps, to prevent
test variable.
rotation or vertical movement during testing.
6.1.2 Loading Device—Any convenient means may be used
5. Significance and Use
for applying a compressive load up to ultimate, and for
5.1 The procedures outlined will provide data that can be
measuring the load within 61 % accuracy. Load shall be
usedtoevaluatethestructuralperformance,underconcentrated
applied through a ball-and-socket joint to assure even applica-
loads, of roof and floor sheathing, separate from the effects of
tion.
the framing, under simulated conditions representative of those
6.1.3 Loading Disks—Two steel disks are required, one
in actual service.
havingadiameterof25mm(1in.),representingaconcentrated
5.2 The procedures are intended to be applied to roof or load, and one of 76 mm (3 in.) representing foot traffic, each
floor sheathing materials installed directly to framing.They are with a thickness of at least 13 mm (0.50 in.). The edge of the
not intended for the evaluation of the framed assembly as a loading disk contacting the test specimen shall be rounded to a
whole. radius not exceeding 1.5 mm (0.06 in.).
FIG. 1 Concentrated Static Load Apparatus
E661 − 03 (2009)
6.1.4 Deflection Gage,mountedonarigidtripodwhoselegs selected from a back or a side to contain enough area of the
rest on the sheathing immediately above the framing members required thickness. Leather thickness shall be expressed in
that are adjacent to the load point (Fig. 1). The deflection gage ounces (1 oz = 0.4 mm ( ⁄64 in.)). The above terms are
should have a range exceeding the maximum anticipated explained in Terminology D1517.
deflection, have a maximum error of 61 %, and be graduated
6.2.1.2 Thread—Thread used to fabricate the bag shall be
to 0.02 mm (0.001 in.).
linen, of four or more plies, meeting the requirements for Type
B, Class 1 or 2, of Fed. Spec. V-T-291E(1).
6.2 Impact Load—The apparatus for the impact load test
shall conform to the requirements of 6.1.1-6.1.4. In addition, 6.2.1.3 Fabrication—The bag shall be 710 mm (28 in.) high
the following equipment shall be used: by 735 mm (29 in.) in circumfrence, with a sidewall of 8-oz
6.2.1 Drop Bag—The bag shall be constructed as in leather 3 mm ( ⁄8 in.) thick. The vertical edges shall be sewn
6.2.1.1-6.2.1.3 (see Fig. 2). together flesh side out and the seam shall be reinforced with a
6.2.1.1 Leather—The leather used in construction of the bag piece of 8-oz leather overlapping 9 mm ( ⁄8 in.) on each side.
shall be harness leather (oak tanned from packer hides) or The side shall then be turned hair side out and sewn to the
bottom. The base (bottom disk) shall be 230 to 265 mm (9 to
latigo leather (alum and vegetable tanned), or both. It shall be
(1) Leather —Use harness leather (oak-tanned from packer hides) or latigo leather (alum and vegetable tanned) (see Terminology D1517 for definitions of terms) (1-oz
leather = ⁄64 in. (0.4 mm) thick).
(2) Thread—Use linen thread (minimum four-ply) in accordance with Fed. Spec. V-T-291E(1), Type B, Class 1 or 2. Double-stitch sidewall seam and seam attaching
sidewall to base.
(3) Metal Shot—Use shot (1 to 3.5-mm (0.039 to 0.138-in.) diameter). Fill bag with shot and cover with two layers of 76-mm (3-in.) foam rubber. Adjust total weight of
assembly to 13.6 kg (30 lb) 6 ⁄2 %, or more, when specified (see 6.2.1.4).
FIG. 2 Leather Drop Bag Assembly
E661 − 03 (2009)
1 3
10 ⁄2 in.) in diameter of 12-oz leather 5 mm ( ⁄16 in.) thick. The recommended for the product used and its intended
seam attaching the sidewall to the base shall be 6 mm ( ⁄4 in.) application, multiplied by the center-to-center spacing of the
from the edge of the base. Two rows of stitching shall be used framing members.
for the vertical sidewall seam and the seam attaching the
7.2.2 Width—The specimen width shall be at least 595 mm
sidewall to the base.
(23 ⁄2 in.). The specimen width shall conform to its nominal
(1) The strap to hoist the bag shall be made from 8-oz
width when edges are fully supported. When edges are
1 5
leather 3 mm ( ⁄8 in.) thick by 16 mm ( ⁄8 in.) wide by 610 mm
unsupported or partially supported, sheathing may be trimmed
(24 in.) long.The strap shall be passed through holes, diametri-
to a width not less than 595 mm (23 ⁄2 in.).
cally opposite, in the sidewalls 40 mm (1 ⁄2 in.) from the top of
7.2.3 Thickness—Measure and report thickness of all
the wall. These holes shall be reinforced with pieces of 8-oz
sheathing specimens after conditioning in accordance with
leather 76 mm (3 in.) square. The leather strap shall be passed
7.3.1 and report.
twice through a 50-mm (2-in.) diameter lifting ring and the
7.2.4 Cut the sheathing to the required size prior to condi-
ends fastened by sewing, riveting, or by use of a buckle.
tioning.
(2) To avoid excessive stretching of the leather sidewall or
7.3 Conditioning of Sheathing—Prior to static and impact
failure of the vertical seam, a sleeve, made from 12-oz leather,
of the same type as the base of the bag, shall be fitted to slip testing, subject sheathing to wetting and drying to simulate
possible typical construction conditions. Test sheathing in-
tightly over the lower portion of the bag. This sleeve should be
250 mm (9 ⁄8 in.) high. tended for roof applications under both dry and wet conditions,
as described in 7.3.1 and 7.3.2. Test sheathing intended for
6.2.1.4 Shot—The bag shall be loosely filled with metal shot
or pellets with diameters of 1 to 3.5 mm (0.039 to 0.138 in.). subfloor or single-layer floor application both dry and in a
re-dried condition after exposure to wet conditions, in accor-
Two layers of 76-mm (3-in.) thick foam rubber or similar
padding shall be placed over the metal shot to prevent spillage dance with 7.3.1 and 7.3.3. This sheathing may also be tested
under wet conditions in accordance with 7.3.2 (see Note 1).
during testing. Adjust the total weight of the drop bag and
metal shot to the weight specified in Table 1, 6 ⁄2 %. This
7.3.1 Dry Tests—Condition sheathing to either constant
value shall be verified before impact tests are conducted. For
weight or moisture content or for at least 2 weeks, at 20 6 3°C
spansgreaterthan1220mm(48in.),theweightofthedropbag
(68 6 6°F) and 65 6 5 % relative humidity.
shall be as agreed upon between the interested parties.
7.3.2 Wet Tests—Expose sheathing to a continuous water
6.2.2 Measuring Rod—A measuring rod, graduated in
spray for 3 days, applied to the top surface of the sheathing at
152-mm(6-in.)incrementsandequippedwithaslidingpointer,
a rate such as to keep this surface continuously wet. Position
shall be used to measure the drop height of the bag.
the sheathing so as to preclude water ponding on it, or
immersion of any portion.
7. Test Specimens
NOTE 3—Asimplified spray tank may be used to support the sheathing
7.1 Select specimens that are representative of the product
in an approximately vertical position during exposure to the water spray.
beingevaluated,bothinaccordancewiththeinherentstructural
The tank should be fitted with drains so that water spray does not
properties, including density, and in accordance with the accumulate, and the sheathing should be placed on blocks to elevate its
lower edge above the residual water in the tank bottom.
thicknessandthicknesstolerancescharacteristicoftheproduct.
Unless otherwise specified, the number of tests shall be such as
7.3.3 Re-dried Tests—Expose sheathing to the 3-day water
to develop the desired confidence level for each property
spray in accordance with 7.3.2 and then dry in accordance with
measured, but conduct at least ten tests as a minimum for each
7.3.1.
test condition evaluated.
7.4 Fabrication of Test Specimens—Install the conditioned
NOTE 2—A specimen can usually be made from a single panel, or
sheathing on framing as shown in Figs. 3 and 4, using the type
assembled from a number of boards (see Figs. 3 and 4).
of framing, fastener schedule, and installation details as
7.2 Specimen Size:
planned for use in service; consider this a part of the test
7.2.1 Length—The specimen length perpendicular to the
conditions. After fabrication, test specimens promptly at am-
main framing members shall conform to the center-to-center
bient laboratory conditions.
spacing, S, anticipated in service (Figs. 3 and 4). Where
NOTE 4—Where sheathing is installed on wood framing, the framing
sheathing is continuous over more than one span, its length
may be of any species and grade commonly used in construction that has
shall be equal to the minimum number of spans permitted or
a specific gravity of 0.40 to 0.55, oven-dry basis, with a maximum
moisture content of 19 %. If nails are used, they may be double-headed to
simplify disassembly of the specimen upon completion of testing, provid-
ing such nails will not damage the testing equipment. Framing may be
reused for more than one test, provided it has not been significantly
TABLE 1 Drop Bag Weights for Impact Load Tests
damaged by previous testing.
Total Weight of Drop Bag (Including
Sheathing Span, S
Shot), kg (lb)
8. Procedure
S# 610 mm (24 in.) 13.6 (30)
610 mm (24 in.) < S# 1220 mm (48 in.) 27.3 (60)
A
8.1 Concentrated Static Load Tests—Apply the concen-
S > 1220 mm (48 in.)
A trated static load at one location on the top surface of the
See 6.2.1.4.
sheathing, midway between framing members (see Fig. 3).
E661 − 03 (2009)
FIG. 3 Concentrated St
...
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:E661–88(Reapproved1997) Designation:E661–03(Reapproved 2009)
Standard Test Method for
Performance of Wood and Wood-Based Floor and Roof
Sheathing Under Concentrated Static and Impact Loads
This standard is issued under the fixed designation E 661; 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.
INTRODUCTION
During construction and occupancy of a building, floor and roof sheathing are subjected to
concentrated loads that frequently govern the thickness required. Static loads may simulate either foot
traffic, or loads from fixtures, when applied through loading disks of appropriate size. Impact loads
will occur during construction and also in service.
Roof sheathing and subflooring are likely to be critical in strength or stiffness, or both, under foot
traffic and construction loads, while single-layer floors are generally critical under fixture loads, foot
traffic, and in-service impact loads. Subfloors, like single floors, must also support fixture loads, but
they will have an additional layer of material, such as underlayment above, which will help to
distribute concentrated loads.
1. Scope
1.1 This test method covers procedures for determining the resistance to deflection and damage of floor and roof sheathing used
in site-built construction subjected to concentrated static loads as well as impact loads from nonrigid blunt objects. It is applicable
to wood and wood-based panels and boards, but is not intended to cover profiled metal decks, nor precast or cast-in-place slabs.
Surface indentation is not evaluated separately from deflection.
1.2 Three applications are covered: roof sheathing, subfloors, and single floors. Roof sheathing is tested in both a dry and a wet
condition, while subfloors and single floors are both tested in a dry condition, as well as a condition of having dried out after being
wet. These moisture conditions are those commonly experienced with site-built construction.
NOTE 1—Whereitisanticipatedthatsheathingwillbesubjectedonlytodryconditionsduringconstructionanduse,orelsetogreatermoistureexposure
than is indicated in 6.3.27.3.2, the corresponding exposure conditions may be modified by agreement between the interested parties. For example,
shop-built construction may be tested dry only, although the possibility of exposure to high humidity or leaks and flooding during use should be
considered.
1.3 The values stated in metric (SI) units are to be regarded as the 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D 1517 Definitions of Terms Relating to Leather Terminology Relating to Leather
E 575 Practice for Reporting Data from Structural Tests of Building Constructions, Elements, Connections, and Assemblies
Practice for Reporting Data from Structural Tests of Building Constructions, Elements, Connections, and Assemblies
E 631 Terminology of Building Constructions
2.2 Federal Standards: Other Standards:
ThistestmethodisunderthejurisdictionofASTMCommitteeE6E06onPerformanceofBuildingsandisthedirectresponsibilityofSubcommitteeE06.11onHorizontal
and Vertical Structures/Structural Performance of Completed Structures .
Current edition approved May 27, 1988. Published September 1988. Originally published as E661–78. Last previous edition E661–78.
Current edition approved April 1, 2009. Published May 2009. Originally approved in 1978. Last previous edition approved in 2003 as E 661 – 03.
Annual Book of ASTM Standards, Vol 15.04.
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.ForAnnualBookofASTMStandards
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.
E661–03 (2009)
Fed. Spec. V-T-291E(1) Linen Thread
3. Summary of Test Method
3.1Roof and floor sheathing specimens are subjected to concentrated loads applied through a 76-mm (3-in.) or a 25-mm (1-in.)
diameter loading disk, depending on the intended use and the properties to be evaluated. They are also subjected to the impact of
a shot-filled drop bag. Specimens are tested in a horizontal position, mounted on fully supported framing members and with loads
applied to the top surface near an edge, or at a location determined to be more vulnerable.Any support framing may be used that
is representative of the anticipated service, as the framing is not considered a major test variable. Terminology
3.1 See Terminology E 631 for terms related to this standard.
4. Significance and Use
4.1The procedures outlined will provide data that can be used to evaluate the structural performance, under concentrated loads,
of roof and floor sheathing, separate from the effects of the framing, under simulated conditions representative of those in actual
service.
4.2The procedures are intended to be applied to roof or floor sheathing materials installed directly to framing. They are not
intended for the evaluation of the framed assembly as a whole. Summary of Test Method
4.1 Roof and floor sheathing specimens are subjected to concentrated loads applied through a 76-mm (3-in.) or a 25-mm (1-in.)
diameter loading disk, depending on the intended use and the properties to be evaluated. They are also subjected to the impact of
a shot-filled drop bag. Specimens are tested in a horizontal position, mounted on fully supported framing members and with loads
applied to the top surface near an edge, or at a location determined to be more vulnerable.Any support framing may be used that
is representative of the anticipated service, as the framing is not considered a major test variable.
5. Significance and Use
5.1 The procedures outlined will provide data that can be used to evaluate the structural performance, under concentrated loads,
of roof and floor sheathing, separate from the effects of the framing, under simulated conditions representative of those in actual
service.
5.2 The procedures are intended to be applied to roof or floor sheathing materials installed directly to framing. They are not
intended for the evaluation of the framed assembly as a whole.
6. Apparatus
5.1
6.1 Concentrated Load—The apparatus for the concentrated load test shall conform to the following requirements (see Fig. 1):
5.1.1
6.1.1 Supports—The framing members shall be supported in order not to deflect under the applied loads. The support system
shall include provisions for rigidly restraining the ends of the framing members, as with blocking and clamps, to prevent rotation
or vertical movement during testing.
5.1.2
6.1.2 Loading Device—Any convenient means may be used for applying a compressive load up to ultimate, and for measuring
the load within 61 % accuracy. Load shall be applied through a ball-and-socket joint to assure even application.
5.1.3
6.1.3 Loading Disks— Two steel disks are required, one having a diameter of 25 mm (1 in.), representing a concentrated load,
and one of 76 mm (3 in.) representing foot traffic, each with a thickness of at least 13 mm (0.50 in.). The edge of the loading disk
contacting the test specimen shall be rounded to a radius not exceeding 1.5 mm (0.06 in.).
5.1.4
6.1.4 Deflection Gage, mounted on a rigid tripod whose legs rest on the sheathing immediately above the framing members that
areadjacenttotheloadpoint(Fig.1).Thedeflectiongageshouldhavearangeexceedingthemaximumanticipateddeflection,have
a maximum error of 61 %, and be graduated to 0.02 mm (0.001 in.).
5.2
6.2 Impact Load— The apparatus for the impact load test shall conform to the requirements of 5.1.1-5.1.46.1.1-6.1.4. In
addition, the following equipment shall be used:
5.2.1
6.2.1 Drop Bag—The bag shall be constructed as in 5.2.1.1-5.2.1.3 6.2.1.1-6.2.1.3 (see Fig. 2).
5.2.1.1
6.2.1.1 Leather—The leather used in construction of the bag shall be harness leather (oak tanned from packer hides),hides) or
latigo leather (alum and vegetable tanned), or both. It shall be selected from a back or a side to contain enough area of the required
thickness. Leather thickness shall be expressed in ounces (1 oz = 0.4 mm ( ⁄64 in.)). The above terms are explained in
DefinitionsTerminology D 1517.
Annual Book of ASTM Standards, Vol 04.07.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
E661–03 (2009)
FIG. 1 Concentrated Static Load Apparatus
5.2.1.2
6.2.1.2 Thread—Thread used to fabricate the bag shall be linen, of four or more plies, meeting the requirements for Type B,
Class 1 or 2, of Fed. Spec. V-T-291E(1).
5.2.1.3
6.2.1.3 Fabrication—Thebagshallbe710mm(28in.)highby735mm(29in.)incircumfrence,withasidewallof8-ozleather
3mm( ⁄8 in.) thick. The vertical edges shall be sewn together flesh side out and the seam shall be reinforced with a piece of 8-oz
leatheroverlapping9mm( ⁄8in.)oneachside.Thesideshallthenbeturnedhairsideoutandsewntothebottom.Thebase(bottom
1 3
disk) shall be 230 to 265 mm (9 to 10 ⁄2 in.) in diameter of 12-oz leather 5 mm ( ⁄16 in.) thick. The seam attaching the sidewall
to the base shall be 6 mm ( ⁄4 in.) from the edge of the base. Two rows of stitching shall be used for the vertical sidewall seam
and the seam attaching the sidewall to the base.
1 5
(a)(1) (a) The strap to hoist the bag shall be made from 8-oz leather 3 mm ( ⁄8 in.) thick by 16 mm ( ⁄8 in.) wide by 610 mm
(24 in.) long. The strap shall be passed through holes, diametrically opposite, in the sidewalls 40 mm (1 ⁄2 in.) from the top of the
wall. These holes shall be reinforced with pieces of 8-oz leather 76 mm (3 in.) square. The leather strap shall be passed twice
through a 50-mm (2-in.) diameter lifting ring and the ends fastened by sewing, riveting, or by use of a buckle.
(b)(2)(b)Toavoidexcessivestretchingoftheleathersidewallorfailureoftheverticalseam,asleeve,madefrom12-ozleather,
of the same type as the base of the bag, shall be fitted to slip tightly over the lower portion of the bag. This sleeve should be 250
mm (9 ⁄8 in.) high.
5.2.1.4
6.2.1.4 Shot—The bag shall be loosely filled with steelmetal shot approximately 2.4 or pellets with diameters of 1 to 3.5 mm
(0.094 in.) in diameter.(0.039 to 0.138 in.). Two layers of 76-mm (3-in.) thick foam rubber or similar padding shall be placed over
the steelmetal shot to prevent spillage during testing. Adjust the total weight of the drop bag and steelmetal shot to the weight
specified in Table 1, 6 ⁄2 %. This value shall be verified before impact tests are conducted. For spans greater than 1220 mm (48
in.), the weight of the drop bag shall be as agreed upon between the interested parties.
5.2.2
E661–03 (2009)
(1) Leather —Use harness leather (oak-tanned from packer hides) or latigo leather (alum and vegetable tanned) (see D Tefrminitionslogy D 1517 for definitions of terms)
(1-oz leather = ⁄64 in. (0.4 mm) thick).
(2) Thread—Use linen thread (minimum four-ply) pe in accordance with Fed. Spec. V-T-291E(1), Type B, Class 1 or 2. Double-stitch sidewall seam and seam attaching
sidewall to base.
(3) StMeetalShot—Use steel shot (21 to 3.45-mm (0.0395 to 0.138-in.) diameter). Fill bag with steel shot and cover with two layers of 76-mm (3-in.) foam rubber. Adjust
total weight of assembly to 13.6 kg (30 lb) 6 ⁄2 %, or more, when specified (see 56.2.1.4).
FIG. 2 Leather Drop Bag Assembly
TABLE 1 Drop Bag Weights for Impact Load Tests
Total Weight of Drop Bag (Including
Sheathing Span, S
Shot), kg (lb)
S# 610 mm (24 in.) 13.6 (30)
610 mm (24 in.) < S# 1220 mm (48 in.) 27.3 (60)
A
S > 1220 mm (48 in.)
A
See 56.2.1.4.
6.2.2 Measuring Rod—Ameasuring rod, graduated in 152-mm (6-in.) increments and equipped with a sliding pointer, shall be
used to measure the drop height of the bag.
6.
7. Test Specimens
67.1 Select specimens that are representative of the product being evaluated, both in accordance with the inherent structural
properties, including density, and in accordance with the thickness and thickness tolerances characteristic of the product. Unless
E661–03 (2009)
otherwise specified, the number of tests shall be such as to develop the desired confidence level for each property measured, but
conduct at least ten tests as a minimum for each test condition evaluated.
NOTE 2—A specimen can usually be made from a single panel, or assembled from a number of boards (see Figs. 3 and 4).
6.2
7.2 Specimen Size:
6.2.1
7.2.1 Length—The specimen length perpendicular to the main framing members shall conform to the center-to-center spacing,
S, anticipated in service (Figs. 3 and 4). Where sheathing is continuous over more than one span, its length shall be equal to the
minimum number of spans permitted or recommended for the product used and its intended application, multiplied by the
center-to-center spacing of the framing members.
6.2.2
FIG. 3 Concentrated Static Load Test Specimens
E661–03 (2009)
FIG. 4 Impact-Load Test Specimens
7.2.2 Width—The specimen width shall be at least 595 mm (23 ⁄2 in.). The specimen width shall conform to its nominal width
when edges are fully supported. When edges are unsupported or partially supported, sheathing may be trimmed to a width not less
than 595 mm (23 ⁄2 in.).
6.2.3
7.2.3 Thickness—Measure and report thickness of all sheathing specimens after conditioning in accordance with 6.3.17.3.1 and
report.
6.2.4Cut7.2.4 Cut the sheathing to the required size prior to conditioning.
6.37.3 Conditioning of Sheathing—Prior to static and impact testing, subject sheathing to wetting and drying to simulate
possible typical construction conditions. Test sheathing intended for roof applications under both dry and wet conditions, as
described in 6.3.17.3.1 and 6.3.27.3.2. Test sheathing intended for subfloor o
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