ASTM E661-03(2015)e1

Standard Test Method for Performance of Wood and Wood-Based Floor and Roof Sheathing Under Concentrated Static and Impact Loads

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.
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 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.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2015
• ICS: 79.040 - Wood, sawlogs and sawn timber
• ICS: 79.060.01 - Wood-based panels in general
• Technical Committee: E06 - Performance of Buildings
• Drafting Committee: E06.11 - Horizontal and Vertical Structures/Structural Performance of Completed Structures

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
´1
Designation: E661 − 03 (Reapproved 2015)
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.
ε NOTE—Units information was editorially corrected in March 2015.
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 1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
1.1 This test method covers procedures for determining the
conversions to SI units that are provided for information only
resistance to deflection and damage of floor and roof sheathing
and are not considered standard.
used in site-built construction subjected to concentrated static
1.4 This standard does not purport to address all of the
loads as well as impact loads from nonrigid blunt objects. It is
safety concerns, if any, associated with its use. It is the
applicable to wood and wood-based panels and boards, but is
responsibility of the user of this standard to establish appro-
not intended to cover profiled metal decks, nor precast or
priate safety and health practices and determine the applica-
cast-in-place slabs. Surface indentation is not evaluated sepa-
bility of regulatory limitations prior to use.
rately from deflection.
1.2 Three applications are covered: roof sheathing,
2. Referenced Documents
subfloors, and single floors. Roof sheathing is tested in both a
2.1 ASTM Standards:
dry and a wet condition, while subfloors and single floors are
D1517 Terminology Relating to Leather
both tested in a dry condition, as well as a condition of having
E575 Practice for Reporting Data from Structural Tests of
dried out after being wet. These moisture conditions are those
Building Constructions, Elements, Connections, and As-
commonly experienced with site-built construction.
semblies
NOTE1—Whereitisanticipatedthatsheathingwillbesubjectedonlyto
E631 Terminology of Building Constructions
dry conditions during construction and use, or else to greater moisture
2.2 Other Standards:
exposure than is indicated in 7.3.2, the corresponding exposure conditions
may be modified by agreement between the interested parties. For Fed. Spec. V-T-291E(1) Linen Thread
example, shop-built construction may be tested dry only, although the
possibility of exposure to high humidity or leaks and flooding during use
3. Terminology
should be considered.
3.1 SeeTerminologyE631fortermsrelatedtothisstandard.
This test method is under the jurisdiction of ASTM Committee E06 on
Performance of Buildings and is the direct responsibility of Subcommittee E06.11 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
on Horizontal and Vertical Structures/Structural Performance of Completed Struc- contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
tures. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved March 1, 2015. Published March 2015. Originally the ASTM website.
approved in 1978. Last previous edition approved in 2009 as E661 – 03 (2009). Available from DLA Document Services, Building 4/D, 700 Robbins Avenue,
DOI: 10.1520/E0661-03R15E01. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
E661 − 03 (2015)
4. Summary of Test Method 6. Apparatus
4.1 Roof and floor sheathing specimens are subjected to
6.1 Concentrated Load—The apparatus for the concentrated
concentrated loads applied through a 3-in. (76-mm) or a 1-in.
load test shall conform to the following requirements (see Fig.
(25-mm) diameter loading disk, depending on the intended use
1):
and the properties to be evaluated. They are also subjected to
6.1.1 Supports—Theframingmembersshallbesupportedin
the impact of a shot-filled drop bag. Specimens are tested in a
ordernottodeflectundertheappliedloads.Thesupportsystem
horizontal position, mounted on fully supported framing mem-
shall include provisions for rigidly restraining the ends of the
bers and with loads applied to the top surface near an edge, or
framing members, as with blocking and clamps, to prevent
at a location determined to be more vulnerable. Any support
rotation or vertical movement during testing.
framing may be used that is representative of the anticipated
6.1.2 Loading Device—Any convenient means may be used
service, as the framing is not considered a major test variable.
for applying a compressive load up to ultimate, and for
measuring the load within 61 % accuracy. Load shall be
5. Significance and Use
applied through a ball-and-socket joint to assure even applica-
5.1 The procedures outlined will provide data that can be
tion.
usedtoevaluatethestructuralperformance,underconcentrated
6.1.3 Loading Disks—Two steel disks are required, one
loads, of roof and floor sheathing, separate from the effects of
havingadiameterof1in.(25mm),representingaconcentrated
the framing, under simulated conditions representative of those
load, and one of 3 in. (76 mm) representing foot traffic, each
in actual service.
with a thickness of at least 0.50 in. (13 mm). The edge of the
loading disk contacting the test specimen shall be rounded to a
5.2 The procedures are intended to be applied to roof or
radius not exceeding 0.06 in. (1.5 mm).
floor sheathing materials installed directly to framing.They are
not intended for the evaluation of the framed assembly as a 6.1.4 Deflection Gage,mountedonarigidtripodwhoselegs
whole. rest on the sheathing immediately above the framing members
FIG. 1 Concentrated Static Load Apparatus
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E661 − 03 (2015)
that are adjacent to the load point (Fig. 1). The deflection gage ounces (1 oz = ⁄64 in. (0.4 mm)). 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 0.001 in. (0.02 mm).
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 28 in. (710 mm) high
the following equipment shall be used: by 29 in. (735 mm) in circumference, with a sidewall of 8-oz
6.2.1 Drop Bag—The bag shall be constructed as in 6.2.1.1 leather ⁄8 in. (3 mm) thick. The vertical edges shall be sewn
– 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 ⁄8 in. (9 mm) 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
latigo leather (alum and vegetable tanned), or both. It shall be bottom. The base (bottom disk) shall be 9 to 10 ⁄2 in. (230 to
selected from a back or a side to contain enough area of the 265 mm) in diameter of 12-oz leather ⁄16 in. (5 mm) thick.The
required thickness. Leather thickness shall be expressed in seam attaching the sidewall to the base shall be ⁄4 in. (6 mm)
(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 (0.039 to 0.138-in. (1 to 3.5-mm) diameter). Fill bag with shot and cover with two layers of 3-in. (76-mm) foam rubber. Adjust total weight of
assembly to 30 lb (13.6 kg) 6 ⁄2 %, or more, when specified (see 6.2.1.4).
FIG. 2 Leather Drop Bag Assembly
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E661 − 03 (2015)
from the edge of the base. Two rows of stitching shall be used 7.2.2 Width—The specimen width shall be at least 23 ⁄2 in.
for the vertical sidewall seam and the seam attaching the (595 mm). The specimen width shall conform to its nominal
sidewall to the base. width when edges are fully supported. When edges are
(1) The strap to hoist the bag shall be made from 8-oz unsupported or partially supported, sheathing may be trimmed
1 5 1
leather ⁄8 in. (3 mm) thick by ⁄8 in. (16 mm) wide by 24 in. to a width not less than 23 ⁄2 in. (595 mm).
(610 mm) long. The strap shall be passed through holes,
7.2.3 Thickness—Measure and report thickness of all
diametrically opposite, in the sidewalls 1 ⁄2 in. (40 mm) from
sheathing specimens after conditioning in accordance with
the top of the wall. These holes shall be reinforced with pieces
7.3.1 and report.
of 8-oz leather 3 in. (76 mm) square. The leather strap shall be
7.2.4 Cut the sheathing to the required size prior to condi-
passed twice through a 2-in. (50-mm) diameter lifting ring and
tioning.
the ends fastened by sewing, riveting, or by use of a buckle.
7.3 Conditioning of Sheathing—Prior to static and impact
(2) To avoid excessive stretching of the leather sidewall or
testing, subject sheathing to wetting and drying to simulate
failure of the vertical seam, a sleeve, made from 12-oz leather,
possible typical construction conditions. Test sheathing in-
of the same type as the base of the bag, shall be fitted to slip
tended for roof applications under both dry and wet conditions,
tightly over the lower portion of the bag. This sleeve should be
7 as described in 7.3.1 and 7.3.2. Test sheathing intended for
9 ⁄8 in. (250 mm) high.
subfloor or single-layer floor application both dry and in a
6.2.1.4 Shot—The bag shall be loosely filled with metal shot
re-dried condition after exposure to wet conditions, in accor-
or pellets with diameters of 0.039 to 0.138 in. (1 to 3.5 mm).
dance with 7.3.1 and 7.3.3. This sheathing may also be tested
Two layers of 3-in. (76-mm) thick foam rubber or similar
under wet conditions in accordance with 7.3.2 (see Note 1).
padding shall be placed over the metal shot to prevent spillage
7.3.1 Dry Tests—Condition sheathing to either constant
during testing. Adjust the total weight of the drop bag and
metal shot to the weight specified in Table 1, 6 ⁄2 %. This weight or moisture content or for at least 2 weeks, at 68 6 6°F
(20 6 3°C) and 65 6 5 % relative humidity.
value shall be verified before impact tests are conducted. For
spansgreaterthan48in.(1220mm),theweightofthedropbag
7.3.2 Wet Tests—Expose sheathing to a continuous water
shall be as agreed upon between the interested parties.
spray for 3 days, applied to the top surface of the sheathing at
6.2.2 Measuring Rod—A measuring rod, graduated in 6-in.
a rate such as to keep this surface continuously wet. Position
(152-mm)incrementsandequippedwithaslidingpointer,shall
the sheathing so as to preclude water ponding on it, or
be used to measure the drop height of the bag.
immersion of any portion.
NOTE 3—Asimplified spray tank may be used to support the sheathing
7. Test Specimens
in an approximately vertical position during exposure to the water spray.
7.1 Select specimens that are representative of the product
The tank should be fitted with drains so that water spray does not
beingevaluated,bothinaccordancewiththeinherentstructural accumulate, and the sheathing should be placed on blocks to elevate its
lower edge above the residual water in the tank bottom.
properties, including density, and in accordance with the
thicknessandthicknesstolerancescharacteristicoftheproduct.
7.3.3 Re-dried Tests—Expose sheathing to the 3-day water
Unless otherwise specified, the number of tests shall be such as
spray in accordance with 7.3.2 and then dry in accordance with
to develop the desired confidence level for each property
7.3.1.
measured, but conduct at least ten tests as a minimum for each
7.4 Fabrication of Test Specimens—Install the conditioned
test condition evaluated.
sheathing on framing as shown in Figs. 3 and 4, using the type
NOTE 2—A specimen can usually be made from a single panel, or
of framing, fastener schedule, and installation details as
assembled from a number of boards (see Figs. 3 and 4).
planned for use in service; consider this a part of the test
7.2 Specimen Size:
conditions. After fabrication, test specimens promptly at am-
7.2.1 Length—The specimen length perpendicular to the
bient laboratory conditions.
main framing members shall conform to the center-to-center
NOTE 4—Where sheathing is installed on wood framing, the framing
spacing, S, anticipated in service (Figs. 3 and 4). Where
may be of any species and grade commonly used in construction that has
sheathing is continuous over more than one span, its length
a specific gravity of 0.40 to 0.55, oven-dry basis, with a maximum
shall be equal to the minimum number of spans permitted or
moisture content of 19 %. If nails are used, they may be double-headed to
recommended for the product used and its intended
simplify disassembly of the specimen upon completion of testing, provid-
ing such nails will not damage the testing equipment. Framing may be
application, multiplied by the center-to-center spacing of the
reused for more than one test, provided it has not been significantly
framing members.
damaged by previous testing.
8. Procedure
TABLE 1 Drop Bag Weights for Impact Load Tests
8.1 Concentrated Static Load Tests—Apply the concen-
Total Weight of Drop Bag
Sheathing Span, S
(Including Shot), lb (kg)
trated static load at one location on the top surface of the
S# 24 in. (610 mm) 30 (13.6)
sheathing,
...

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.
´1
Designation: E661 − 03 (Reapproved 2009) E661 − 03 (Reapproved 2015)
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.
ε NOTE—Units information was editorially corrected in March 2015.
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—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) inch-pound units are to be regarded as the standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered 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:
D1517 Terminology Relating to Leather
E575 Practice for Reporting Data from Structural Tests of Building Constructions, Elements, Connections, and Assemblies
E631 Terminology of Building Constructions
This test method is under the jurisdiction of ASTM Committee E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.11 on Horizontal
and Vertical Structures/Structural Performance of Completed Structures.
Current edition approved April 1, 2009March 1, 2015. Published May 2009March 2015. Originally approved in 1978. Last previous edition approved in 20032009 as
E661 – 03.E661 – 03 (2009). DOI: 10.1520/E0661-03R09.10.1520/E0661-03R15E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
E661 − 03 (2015)
2.2 Other Standards:
Fed. Spec. V-T-291E(1) Linen Thread
3. Terminology
3.1 See Terminology E631 for terms related to this standard.
4. Summary of Test Method
4.1 Roof and floor sheathing specimens are subjected to concentrated loads applied through a 76-mm (3-in.)3-in. (76-mm) or
a 25-mm (1-in.)1-in. (25-mm) 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
6.1 Concentrated Load—The apparatus for the concentrated load test shall conform to the following requirements (see Fig. 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.
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.
6.1.3 Loading Disks—Two steel disks are required, one having a diameter of 25 mm (1 in.),1 in. (25 mm), representing a
concentrated load, and one of 76 mm (3 in.)3 in. (76 mm) representing foot traffic, each with a thickness of at least 13 mm (0.50
in.).0.50 in. (13 mm). The edge of the loading disk contacting the test specimen shall be rounded to a radius not exceeding 1.5
mm (0.06 in.).0.06 in. (1.5 mm).
6.1.4 Deflection Gage, mounted on a rigid tripod whose legs rest on the sheathing immediately above the framing members that
are adjacent to the load point (Fig. 1). The deflection gage should have a range exceeding the maximum anticipated deflection, have
a maximum error of 61 %, and be graduated to 0.02 mm (0.001 in.).0.001 in. (0.02 mm).
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, the
following equipment shall be used:
6.2.1 Drop Bag—The bag shall be constructed as in 6.2.1.1 – 6.2.1.3 (see Fig. 2).
6.2.1.1 Leather—The leather used in construction of the bag shall be harness leather (oak tanned from packer 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.)).in. (0.4 mm)). The above terms are explained
in Terminology D1517.
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).
6.2.1.3 Fabrication—The bag shall be 710 mm (28 in.) high by 735 mm (29 in.) in circumfrence,28 in. (710 mm) high by 29
in. (735 mm) in circumference, with a sidewall of 8-oz leather 3 mm ( ⁄8 in.)in. (3 mm) thick. The vertical edges shall be sewn
together flesh side out and the seam shall be reinforced with a piece of 8-oz leather overlapping 9 mm ( ⁄8 in.)in. (9 mm) on each
side. The side shall then be turned hair side out and sewn to the bottom. The base (bottom disk) shall be 2309 to 26510 ⁄2 mm (9in.
1 3
(230 to 10265 ⁄2 in.)mm) in diameter of 12-oz leather 5 mm ( ⁄16 in.)in. (5 mm) thick. The seam attaching the sidewall to the base
shall be 6 mm ( ⁄4 in.)in. (6 mm) 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
(1) The strap to hoist the bag shall be made from 8-oz leather 3 mm ( ⁄8 in.)in. (3 mm) thick by 16 mm ( ⁄8 in.)in. (16 mm)
wide by 610 mm (24 in.)24 in. (610 mm) long. The strap shall be passed through holes, diametrically opposite, in the sidewalls
40 mm (11 ⁄2 in.)in. (40 mm) from the top of the wall. These holes shall be reinforced with pieces of 8-oz leather 76 mm (3 in.)3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, http://quicksearch.dla.mil
´1
E661 − 03 (2015)
FIG. 1 Concentrated Static Load Apparatus
in. (76 mm) square. The leather strap shall be passed twice through a 50-mm (2-in.)2-in. (50-mm) diameter lifting ring and the
ends fastened by sewing, riveting, or by use of a buckle.
(2) To avoid excessive stretching of the leather sidewall or 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 tightly over the lower portion of the bag. This sleeve should be 250
mm (99 ⁄8 in.) in. (250 mm) high.
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.).0.039
to 0.138 in. (1 to 3.5 mm). Two layers of 76-mm (3-in.)3-in. (76-mm) thick foam rubber or similar padding shall be placed over
the metal shot to prevent spillage during testing. Adjust the total weight of the drop bag and metal 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.),48 in.
(1220 mm), the weight of the drop bag shall be as agreed upon between the interested parties.
6.2.2 Measuring Rod—A measuring rod, graduated in 152-mm (6-in.)6-in. (152-mm) increments and equipped with a sliding
pointer, shall be used to measure the drop height of the bag.
7. Test Specimens
7.1 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
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).
7.2 Specimen Size:
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
´1
E661 − 03 (2015)
(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.)0.138-in. (1 to 3.5-mm) diameter). Fill bag with shot and cover with two layers of 76-mm (3-in.)3-in. (76-mm)
foam rubber. Adjust total weight of assembly to 13.6 kg (30 lb)30 lb (13.6 kg) 6 ⁄2 %,%, or more, when specified (see 6.2.1.4).
FIG. 2 Leather Drop Bag Assembly
TABLE 1 Drop Bag Weights for Impact Load Tests
Total Weight of Drop Bag
Sheathing Span, S
(Including 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.)
TABLE 1 Drop Bag Weights for Impact Load Tests
Total Weight of Drop Bag
Sheathing Span, S
(Including Shot), lb (kg)
S # 24 in. (610 mm) 30 (13.6)
24 in. (610 mm) < S # 48 in. (1220 mm) 60 (27.3)
A
S > 48 in. (1220 mm)
A
See 6.2.1.4.
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.
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E661 − 03 (2015)
FIG. 3 Concentrated Static Load Test Specimens
7.2.2 Width—The specimen width shall be at least 595 mm (2323 ⁄2 in.).in. (595 mm). 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 (2323 ⁄2 in.).in. (595 mm).
7.2.3 Thickness—Measure and report thickness of all sheathing specimens after conditioning in accordance with 7.3.1 and
report.
7.2.4 Cut the sheathing to the required size prior to conditioning.
7.3 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
7.3.1 and 7.3.2. Test sheathing intended for subfloor or single-layer floor application both dry and in a re-dried condition after
exposure to wet conditions, in accordance 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).
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E661 − 03 (2015)
FIG. 4 Impact-Load Test Specimens
7.3.1 Dry Tests—Condition sheathing to either constant weight or moisture content or for at least 2 weeks, at 2068 6 3°C (686°F
(20 6 6°F)3°C) and 65 6 5 % relative humidity.
7.3.2 Wet Tests—Expose sheathing to a continuous water spra
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