ASTM C1764-12
(Test Method)Standard Test Methods for Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical Wall Applications
Standard Test Methods for Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical Wall Applications
SIGNIFICANCE AND USE
4.1 General:
4.1.1 Non metallic reinforced Portland Cement Based Plaster are vertically applied exterior wall claddings that may be subject to variety of conditions over the claddings service life. The series of tests described in this standard evaluates performance under a variety of test conditions and exposures. Any given project may not be subject to all of the test conditions described herein and all of the test methods may not evaluate all exposures for a given project.
4.2 Transverse Load:
4.2.1 This test determines the ultimate wind load resistance of the wall assembly including influence of the framing, sheathing, and means of attachment.
4.3 Vertical Load:
4.3.1 The weight and attachment mechanism of Portland Cement Based Plaster results in a vertical load transfer to the plaster base. This test method determines the ultimate vertical load capacity of the cladding assembly based on taking the specimen to failure.
4.4 Embedment:
4.4.1 Plaster bases serve as a key, reinforcement and attachment mechanism for Portland Cement Based Plaster. The thickness, profile, and material properties of the plaster bases must be such that it is adequately embedded in the Portland Cement Based Plaster. This can be accomplished through use of a self furred non metallic plaster base or other means such as furring strips. This test procedure determines the effectiveness of the furring mechanism to ensure that the minimum embedment is obtained.
4.5 Fastener Pull Through Resistance:
4.5.1 The non metallic lath is secured to the building frame or substrate with fasteners. This test evaluates the fastener attachment effectiveness.
4.6 Alkali Resistance (Glass Fiber Lath Only):
4.6.1 Per E2098.
SCOPE
1.1 These test methods evaluate the performance of vertical wall applications of non metallic plaster bases used with Portland Cement Based Plaster under a variety of test exposures.
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 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
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Standards Content (Sample)
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Designation: C1764 − 12
StandardTest Methods for
Non Metallic Plaster Bases (Lath) Used with Portland
Cement Based Plaster in Vertical Wall Applications
This standard is issued under the fixed designation C1764; 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. Terminology
1.1 These test methods evaluate the performance of vertical
3.1 Definitions—For definitions of terms used in these test
wall applications of non metallic plaster bases used with
methods, refer to Terminology E631.
Portland Cement Based Plaster under a variety of test expo-
3.2 Definitions of Terms Specific to This Standard:
sures.
3.2.1 non metallic, plaster base (lath)—material used as a
1.2 Units—The values stated in either SI units or inch-
base for Portland Cement Based Plaster that is flat or self
pound units are to be regarded separately as standard. The
furred.
values stated in each system may not be exact equivalents;
therefore, each system shall be used independently of the other.
4. Significance and Use
Combining values from the two systems may result in non-
4.1 General:
conformance with the standard.
4.1.1 Non metallic reinforced Portland Cement Based Plas-
1.3 This standard does not purport to address all of the
ter are vertically applied exterior wall claddings that may be
safety concerns, if any, associated with its use. It is the
subject to variety of conditions over the claddings service life.
responsibility of the user of this standard to establish appro-
The series of tests described in this standard evaluates perfor-
priate safety and health practices and determine the applica-
mance under a variety of test conditions and exposures. Any
bility of regulatory limitations prior to use.
given project may not be subject to all of the test conditions
described herein and all of the test methods may not evaluate
2. Referenced Documents
all exposures for a given project.
2.1 ASTM Standards:
4.2 Transverse Load:
C926 Specification for Application of Portland Cement-
4.2.1 This test determines the ultimate wind load resistance
Based Plaster
of the wall assembly including influence of the framing,
E330 Test Method for Structural Performance of Exterior
sheathing, and means of attachment.
Windows, Doors, Skylights and CurtainWalls by Uniform
Static Air Pressure Difference
4.3 Vertical Load:
E631 Terminology of Building Constructions
4.3.1 The weight and attachment mechanism of Portland
E2098 Test Method for Determining Tensile Breaking
Cement Based Plaster results in a vertical load transfer to the
Strength of Glass Fiber Reinforcing Mesh for Use in Class
plaster base. This test method determines the ultimate vertical
PB Exterior Insulation and Finish Systems (EIFS), after
load capacity of the cladding assembly based on taking the
Exposure to a Sodium Hydroxide Solution
specimen to failure.
2.2 ICC-ES Acceptance Criteria:
4.4 Embedment:
AC 191 Acceptance Criteria for Metal Plaster Bases (Lath)
4.4.1 Plaster bases serve as a key, reinforcement and attach-
ment mechanism for Portland Cement Based Plaster. The
thickness, profile, and material properties of the plaster bases
These test methods are under the jurisdiction of ASTM Committee C11 on
must be such that it is adequately embedded in the Portland
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and Cement Based Plaster. This can be accomplished through use
Related Products.
of a self furred non metallic plaster base or other means such
Current edition approved Oct. 1, 2012. Published August 2013. DOI: 10.1520/
as furring strips. This test procedure determines the effective-
C1764-12.
ness of the furring mechanism to ensure that the minimum
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
embedment is obtained.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.5 Fastener Pull Through Resistance:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1764 − 12
4.5.1 The non metallic lath is secured to the building frame Cement Based Plaster shall be mixed and applied in the
or substrate with fasteners. This test evaluates the fastener configuration of the test specimen.
attachment effectiveness.
6.2 Vertical Load:
4.6 Alkali Resistance (Glass Fiber Lath Only):
6.2.1 Construct three test frames measuring 12 inch (305
4.6.1 Per E2098.
mm) by 20 inch (508 mm) using nominal 2 inch (50 mm) by
4 inch (100 mm) wood lumber with specific gravity of 0.42.
5. Sampling, Test Specimens, and Test Units
The test frame shall have one intermediate stud with top and
5.1 The number, size and configuration of the test speci-
bottomplatesandsheathedonesidewith ⁄2inch(13mm)thick
mens shall be as per each test procedure with the exception of
gypsum sheathing.Attach studs to plates using 2 16d (3 ⁄2 inch
Transverse Load tests which shall incorporate wood or steel
(89 mm) length) nails and sheathing to framing using 6d (2
framing as determined by the user. Samples shall be represen-
inch length) common nails or equal fastened 8 inches (200
tative of standard products and construction methods.
mm) on center. A test panel shall be prepared measuring 6
inches (152 mm) high by 16 inches (406 mm) wide and
6. Test Specimens
consisting of a water-resistive barrier (provided to prevent
6.1 Transverse Load: adhesion of the test panel to the test frame); non metallic
6.1.1 Construct three test specimens. Test specimen size plaster base, which is attached through the water-resistive
shall be minimum 4 ft (1.2 m) by 8 ft (2.4 m) and constructed barrier to the intermediate framing member with one fastener;
representative of end use conditions. Framing members shall and apply Portland Cement Based Plaster per C926. The
be wood or steel as determined by the user. C926 Portland samples shall be cured a minimum of 28 days. Refer to Fig. 1
FIG. 1 Test Assembly
C1764 − 12
for an illustration of the test assembly. 7.5.1 The apparatus shall be capable of subjecting specimen
uniformly to test conditions described in Test Method E2098.
6.3 Embedment:
6.3.1 Construct one test frame using nominal 2 inch (50
8. Conditioning
mm) by 4 inch (10
...
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