ASTM C1780-13

Standard Practice for Installation Methods for Adhered Manufactured Stone Masonry Veneer

SCOPE
1.1 This practice is intended to provide accepted procedures to designers and installers of adhered manufactured stone masonry veneer in residential and commercial construction. This information is meant to complement the specific installation instructions provided by manufacturers of adhered manufactured stone masonry veneers and recognized building codes, but is not meant to replace them. This practice does not address installation methods or techniques for all materials in the building envelope. This practice covers the installation of adhered manufactured stone masonry veneer (AMSMV) units for application as adhered veneer to exterior and interior walls, columns, landscape structures and other structures suitable to receive adhered veneer. The units included in this practice are manufactured to meet the requirements of Specification C1670. This practice is limited to the installation of AMSMV units. This practice does not cover all flashing or moisture management requirements. Refer to the applicable building code and project documents for additional flashing and moisture management requirements.Note 1—The Masonry Veneer Manufacturers Association (MVMA) publication Installation Guide for Adhered Concrete Masonry Veneer provides generally accepted methods and details for installation and flashing.  
1.2 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.  
1.3 All workmanship and materials related to the installation of AMSMV units shall meet the requirements of the contract documents and building code having jurisdiction over the project.  
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. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)

General Information

• Status: Historical
• Publication Date: 31-May-2013
• ICS: 91.080.30 - Masonry
• Technical Committee: C15 - Masonry – Manufactured Masonry Units, Mortars and Grouts
• Drafting Committee: C15.05 - Masonry Assemblies

Relations

• Replaced By: ASTM C1780-14 - Standard Practice for Installation Methods for Adhered Manufactured Stone Masonry Veneer
• Effective Date: 01-Jul-2014

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: C1780 − 13
StandardPractice for
Installation Methods for Adhered Manufactured Stone
Masonry Veneer
This standard is issued under the fixed designation C1780; 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 bility of regulatory limitations prior to use. (Warning—Fresh
hydraulic cementitious mixtures are caustic and may cause
1.1 This practice is intended to provide accepted procedures
chemical burns to skin and tissue upon prolonged exposure. )
to designers and installers of adhered manufactured stone
masonry veneer in residential and commercial construction.
2. Referenced Documents
This information is meant to complement the specific installa-
tion instructions provided by manufacturers of adhered manu- 3
2.1 ASTM Standards:
facturedstonemasonryveneersandrecognizedbuildingcodes,
C90 Specification for Loadbearing Concrete Masonry Units
butisnotmeanttoreplacethem.Thispracticedoesnotaddress
C270 Specification for Mortar for Unit Masonry
installation methods or techniques for all materials in the
C482 Test Method for Bond Strength of Ceramic Tile to
building envelope. This practice covers the installation of
Portland Cement Paste
adhered manufactured stone masonry veneer (AMSMV) units
C847 Specification for Metal Lath
for application as adhered veneer to exterior and interior walls,
C926 Specification for Application of Portland Cement-
columns, landscape structures and other structures suitable to
Based Plaster
receive adhered veneer. The units included in this practice are
C932 Specification for Surface-Applied Bonding Com-
manufacturedtomeettherequirementsofSpecificationC1670.
pounds for Exterior Plastering
This practice is limited to the installation of AMSMV units.
C933 Specification for Welded Wire Lath
This practice does not cover all flashing or moisture manage-
C979 Specification for Pigments for Integrally Colored Con-
ment requirements. Refer to the applicable building code and
crete
project documents for additional flashing and moisture man-
C1032 Specification for Woven Wire Plaster Base
agement requirements.
C1059 Specification for LatexAgents for Bonding Fresh To
NOTE 1—The Masonry Veneer Manufacturers Association (MVMA)
Hardened Concrete
publication Installation Guide for Adhered Concrete Masonry Veneer
C1063 Specification for Installation of Lathing and Furring
provides generally accepted methods and details for installation and
flashing. to Receive Interior and Exterior Portland Cement-Based
Plaster
1.2 The values stated in inch-pound units are to be regarded
C1180 Terminology of Mortar and Grout for Unit Masonry
as standard. The values given in parentheses are mathematical
C1232 Terminology of Masonry
conversions to SI units that are provided for information only
C1384 Specification for Admixtures for Masonry Mortars
and are not considered standard.
C1670 Specification For Adhered Manufactured Stone Ma-
1.3 All workmanship and materials related to the installa-
sonry Veneer (AMSMV) Units
tion of AMSMV units shall meet the requirements of the
C1714 Specification for Preblended Dry Mortar Mix for
contract documents and building code having jurisdiction over
Unit Masonry
the project.
E2556/E2556M Specification for Vapor Permeable Flexible
1.4 This standard does not purport to address all of the
Sheet Water-Resistive Barriers Intended for Mechanical
safety concerns, if any, associated with its use. It is the
Attachment
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
Annual Book of ASTM Standards. Vol 04.01. See the section on Safety
This practice is under the jurisdiction of ASTM Committee C15 on Manufac- Precautions in the Manual of Cement Testing.
tured Masonry Units and is the direct responsibility of Subcommittee C15.05 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Masonry Assemblies. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Current edition approved June 1, 2013. Published June 2013. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
C1780–13 the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1780 − 13
2.2 Other Standards: 3.1.9 sheathed frame substrate, n—wood or metal/steel
TMS 402/ACI 530/ASCE 5 Building Code Requirements framing covered by a building code approved sheathing
for Masonry Structures material.
TMS 602/ACI 530.1/ASCE 6 Specification for Masonry
3.1.10 thumb-print hard, adj—description of mortar joints
Structures
to determine their readiness for tooling determined when the
2.3 ANSI Standards:
mortar will retain the imprint of a thumb but no mortar is
ANSI A118.1 American National Standard Specifications
transferred to the thumb.
for Dry-Set Portland Cement Mortar
3.1.11 tight fit joint, n—a joint created when units are
ANSI A118.4 American National Standard Specifications
installed with edges touching or less than ⁄8 in. (10 mm)
for Latex-Portland Cement Mortar
distance between units.
2.4 ICRI International Concrete Repair Institute:
3.1.11.1 Discussion—Many units have varied and random
No. 310.2–1997 Selecting and Specifying Concrete Surface
edges which make it impossible to define specific minimum or
Preparation for Sealers, Coatings and Polymer Overlays
maximum joint space.
(formerly No. 03732). Concrete Surface Profile Chips.
3.1.12 water resistive barrier (WRB), n—a material behind
2.5 Masonry Veneer Manufacturers Association:
an exterior wall covering that is intended to resist liquid water
MVMA Installation Guide for Adhered Concrete Masonry
that has penetrated the exterior covering from further intruding
Veneer
into the exterior wall assembly.
3.2 Refer to Terminology C1180 for additional terminology
3. Terminology
for mortar and Terminology C1232 for additional terminology
3.1 Definitions of Terms Specific to This Standard:
for masonry.
3.1.1 adhered manufactured stone masonry veneer
(AMSMV), n—the assembly of thin masonry units adhered to a
4. Materials
backing with a cementitious mortar.
4.1 Adhered Manufactured Stone Masonry Veneer
3.1.1.1 Discussion—Other names have been used for this
(AMSMV) shall comply with the following requirements:
product since it was developed and the Masonry Veneer
4.1.1 AMSMV Units shall comply with Specification
Manufacturers Association can provide historic information
C1670.
regarding names.
4.1.2 AMSMV Units shall comply with the Building Code
3.1.2 back butter, v—theactofapplyingasettingbedmortar
Requirements for Masonry Structures; TMS 402/ACI 530/
to the back of a masonry unit.
ASCE 5, Section 6.3.2.1–Adhered Veneer, Unit sizes.
3.1.3 brown coat, n—in multiple coat stucco work, the
4.2 Water Resistive Barrier shall comply with Specification
second coat, applied over the scratch coat.
E2556/E2556M.
3.1.4 drainage wall system, n—a system installation that
4.3 Lath shall comply with one of the following:
creates a physical planar air gap between cladding system and
4.3.1 Expanded metal lath shall be corrosion resistant, shall
water resistive barrier.
have a minimum weight of 2.5 lb (1.13 kg) per square yard,
3.1.5 foundation weep screed, n—an accessory used to
and shall comply with the requirements of Specification C847.
terminate adhered manufactured stone masonry veneer at the
4.3.2 Woven wire mesh shall be corrosion resistant, shall be
bottom of exterior framed walls.
a minimum of 18 gauge, and shall comply with the require-
3.1.5.1 Discussion—This accessory shall have a sloped,
ments of Specification C1032.
solid, or perforated, ground or screed flange to facilitate the
4.3.3 Welded wire lath shall be corrosion resistant and shall
removal of moisture from the air gap and a vertical attachment
comply with Specification C933.
flange not less than 3 ⁄2 in. (89 mm) long.
4.3.4 Non-metallic lath material shall be corrosion resistant,
with a published evaluation report from an ANSI accredited
3.1.6 full setting bed, n—mortar bed of specified thickness,
evaluationservicethatratesthelathasacceptablesubstitutefor
covering the complete back of units and free of voids.
the above listed laths and be rated for use behind AMSMV.
3.1.7 scratch coat, n—the first coat of mortar or hydraullic
cement based plaster applied to a base and then scratched to NOTE 2—It is acceptable to use lath materials that comply with 4.3 that
alsoprovideapaperbackingwhichcomplieswiththerequirementsof4.2.
create additional bonding area and mechanical interlock.
4.4 Mortar:
3.1.8 setting bed, n—the mortar used to bond units to a
4.4.1 Mortar shall comply with one of the following:
prepared surface or scratch coat.
4.4.1.1 Type N or Type S of Specification C270.
4.4.1.2 Type N or Type S of Specification C1714.
Available from American Society of Civil Engineers (ASCE), 1801 Alexander 4.4.1.3 ANSI A118.1 or ANSI A118.4.
Bell Dr., Reston, VA 20191, http://www.asce.org.
NOTE 3—Mortar may be specified by the proportion method or the
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
property method of Specification C270.
4th Floor, New York, NY 10036, http://www.ansi.org.
Available from International Concrete Repair Institute (ICRI), 38800 Country
4.4.2 Admixtures shall comply with Specification C1384.
Club Drive Farmington Hills, MI 48331, http://www.icri.org.
4.4.3 Bonding agents shall comply with Specification
Available from Masonry Veneer Manufacturers Association (MVMA), 13750
Sunrise Valley Drive Herndon, VA 20171, http://www.masonryveneer.org. C1059 or Specification C932.
C1780 − 13
4.4.4 Mortar coloring pigments shall comply with Specifi- material, in accordance with the WRB manufacturer’s instal-
cation C979. lation instructions. Each layer is not required to be the same
material. The WRB shall be integrated with all flashing
4.5 Lath fasteners shall comply with Specification C1063.
materials in such a manner that prevents penetration of water
4.6 FoundationweepscreedshallcomplywithSpecification
beyond the WRB. WRB shall overlap a minimum 6 in. (152
C1063.
mm) at vertical joints and a minimum 2 in. (50 mm) at
horizontal joints and shall be applied in shingle fashion. WRB
4.7 Stucco system scratch or brown coat, when used as the
AMSMV scratch coat, shall comply with Specification C926 fasteners shall be spaced in accordance with the water resistive
barrier manufacturer’s installation instructions.
up to the brown coat without application of the finish coat.
4.8 Water used for mixing mortar or dampening units,
NOTE 4—Some building code jurisdictions allow a single layer WRB
when a drainage wall system is used. This is an acceptable installation
scratch coat, or masonry surface shall be clean and free of
when the drainage wall system meets the requirements of Section 10 of
amounts of oils, acids, alkalies, salts, organic materials, or
this practice.
other substances that are deleterious to mortar or any metal in
the wall. 6.3.2 Sheathed Frame Substrate:
6.3.2.1 Foundation Weep Screed—Install foundation weep
5. Ambient Conditions
screed in accordance with Specification C1063.
6.3.2.2 Lath—Install lath which meets the requirements of
5.1 Hot and Dry Conditions—If the ambient conditions
exceed 100°F (37°C) or 90°F (32°C) with a wind velocity 4.3 in accordance with Specification C1063, or the alternate
lath manufacturer’s installation instructions, or the project
greater than 8 mph (12.9 km/h) comply with the hot weather
construction requirements of local building code, the recom- design documents.
mendations of AMSMV unit manufacturer and hot weather
NOTE 5—In order to facilitate embedment of lath in mortar, some lath
construction provisions of TMS 602/ACI 530.1/ASCE 6. If
productswillrequirefurring.Furringandself-furringlathareaddressedin
there is a contradiction among documents, local building code
Specification C1063, Table 3.
shall prevail.
6.3.2.3 ScratchCoat—Installascratchcoatwithaminimum
5.1.1 When AMSMV is applied in hot or dry weather,
1 3
thickness of ⁄2 in. (13 mm) and maximum thickness of ⁄4 in.
before applying mortar, moisten the scratch coat with a fine
(19 mm) of mortar. The scratch coat shall be applied with
spray of water or a wet brush to prevent excessive absorption
sufficientmaterialandpressuretofullyengageandencapsulate
of water from the mortar.The scratch coat shall appear wet but
the lath and with sufficient thickness of material to allow for
withoutfreewateronthesurface.Unitsshallalsobemoistened
scoring the surface. As soon as the scratch coat becomes
following the requirements of 7.2.1
somewhat firm the entire surface shall be scored in the
5.2 Freezing or Low Temperatures—Accelerating admix-
horizontal direction only.
tures shall comply with Specification C1384. Anti-freeze
6.3.3 Open Studs, Non-Solid Sheathing and Metal Building
admixtures to lower freezing point of mortar shall not be used.
Panels:
Accelerating admixtures containing calcium chloride shall not
NOTE 6—Non-solid sheathing description is intended to address prod-
be used. If the ambient conditions are below 40°F (4°C), the
ucts such as foam sheathing, fiberboard sheathing, and other sheathing
installation shall comply with the cold weather construction
products that would not resist the force used to press units onto scratch
provisions of TMS 602/ACI 530.1/ASCE 6.
coat, resulting in detrimental lath movement.
6.3.3.1 Foundation Weep Screed—Install foundation weep
6. Substrate/Surface Preparation
screed in accordance with Specification C1063.
6.1 The substrates and preparation that follow are typical
6.3.3.2 Lath—Install paperbacked 3.4 lb (1.54 kg) ⁄8 in. (10
and field proven applications. Installation over any other
mm)riblathinaccordancewithSpecificationC1063unlessthe
substrate requires the approval of the AMSMV unit manufac-
design documents provide other criteria. Paper backing must
turer.
meet 4.2 to be considered one of the WRB layers.
6.2 Masonry:
NOTE 7—Paperbacked lath is an effective method to prevent mortar
6.2.1 Install units directly on masonry that is clean and free
from reaching insulation cavity in open stud construction or space
of paint, dirt, sealers, loose or spalling material.
between ribs in metal building panels.Aseparately applied layer of WRB
6.2.2 All masonry surfaces that are dirty, painted, coated
can serve the same purpose. Non-solid sheathing applications do not
with curing compounds or surface sealed, shall be cleaned by require paperbacked lath as
...