ASTM C1722-23
(Guide)Standard Guide for Repair and Restoration of Dimension Stone
Standard Guide for Repair and Restoration of Dimension Stone
SIGNIFICANCE AND USE
4.1 The purpose of this guide is to assist those who wish to restore facades constructed of or finished with dimension stone. It is an aid to owners, building managers, architects, engineers, contractors and others involved with restoring dimension stone.
4.2 This guide is not meant to supersede manufacturers' directions and recommendations for the use of their specific products, or written directions from the architect or building owner. When manufacturers' directions are in conflict with this guide, follow their recommendations or consult with their technical staff for further direction.
4.3 Prior to undertaking a full-scale repair or cleaning procedure, the methods under consideration for repair, patching or cleaning should be tested on an area not easily visible or on sample stones. The test will assist in judging the effectiveness of the chosen method and permit assessment of potential damage to the building stone. Completely evaluate the success of the sample repairs before undertaking the full-scale cleaning or repair procedure.
SCOPE
1.1 This guide describes materials and procedures for restoring facades constructed of or finished with dimension stone. All of the materials, procedures, and principles are suitable for restoration of historic and nonhistosric structures.
1.2 This guide is not intended to address restoration of interior dimension stone, although many of the materials and procedures may be suitable for interior use.
1.3 Units—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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1722 − 23
Standard Guide for
1
Repair and Restoration of Dimension Stone
This standard is issued under the fixed designation C1722; 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 C207 Specification for Hydrated Lime for Masonry Pur-
poses
1.1 This guide describes materials and procedures for re-
C270 Specification for Mortar for Unit Masonry
storing facades constructed of or finished with dimension
C1180 Terminology of Mortar and Grout for Unit Masonry
stone. All of the materials, procedures, and principles are
C1242 Guide for Selection, Design, and Installation of
suitable for restoration of historic and nonhistosric structures.
Dimension Stone Attachment Systems
1.2 This guide is not intended to address restoration of
C1324 Test Method for Examination and Analysis of Hard-
interior dimension stone, although many of the materials and
ened Masonry Mortar
procedures may be suitable for interior use.
C1489 Specification for Lime Putty for Structural Purposes
C1515 Guide for Cleaning of Exterior Dimension Stone,
1.3 Units—The values stated in inch-pound units are to be
regarded as standard. The values given in parentheses are Vertical And Horizontal Surfaces, New or Existing
C1521 Practice for Evaluating Adhesion of Installed Weath-
mathematical conversions to SI units that are provided for
information only and are not considered standard. erproofing Sealant Joints
C1707 Specification for Pozzolanic Hydraulic Lime for
1.4 This standard does not purport to address all of the
Structural Purposes
safety concerns, if any, associated with its use. It is the
3
2.2 OSHA Directive:
responsibility of the user of this standard to establish appro-
STD 1-12.026 Abrasive Operations Using Cut Off Wheels
priate safety, health, and environmental practices and deter-
and Masonry Saws
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3. Terminology
dance with internationally recognized principles on standard-
3.1 Definitions—For definitions of terms used in this guide,
ization established in the Decision on Principles for the
other than those listed below, refer to Terminology C119 and
Development of International Standards, Guides and Recom-
Terminology C1180.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 defect, n—naturally occuring flaw in the stone.
2. Referenced Documents
3.2.2 dimension stone restoration consultant, n—one who is
2
2.1 ASTM Standards:
knowledgeable and experienced with the care, restoration, and
C5 Specification for Quicklime for Structural Purposes
repair of building dimension stone.
C10 Specification for Natural Cement
3.2.3 distress, n—localized damage of stone units such as
C91 Specification for Masonry Cement
cracks, chips, holes, deterioration, bowing, and projections that
C119 Terminology Relating to Dimension Stone
have been broken off or worn down caused by wear, erosion,
C141 Specification for Hydrated Hydraulic Lime for Struc-
settlement, displacement, or other adverse chemical or me-
tural Purposes
chanical actions.
C150 Specification for Portland Cement
3.2.4 dutchman repair, n—a stone repair method whereby a
portion of a stone unit is cut out and replaced with another
1 piece of stone (called a dutchman). The dutchman is usually
This guide is under the jurisdiction of ASTM Committee C18 on Dimension
Stone and is the direct responsibility of Subcommittee C18.07 on Environmental
rectangular or square in shape, but may also be rounded, and is
Properties, Behavior, and Cleaning.
usually at a corner or edge of the stone unit.
Current edition approved March 1, 2023. Published April 2023. Originally
approved in 2011. Last previous edition approved in 2018 as C1722 – 18. DOI: 3.2.5 pointing, v—placing mortar in the outer portion of the
10.1520/C1722-23.
joints between stone units. To point stone joints, the outer
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from Occupational Safety and Health Administration (OSHA), 200
the ASTM website. Constitution Ave., NW, Washington, DC 20210, http://www.osha.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C70
...
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: C1722 − 18 C1722 − 23
Standard Guide for
1
Repair and Restoration of Dimension Stone
This standard is issued under the fixed designation C1722; 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
1.1 This guide describes materials and procedures for restoring facades constructed of or finished with dimension stone. All of the
materials, procedures, and principles are suitable for restoration of historic and nonhistosric structures.
1.2 This guide is not intended to address restoration of interior dimension stone, although many of the materials and procedures
may be suitable for interior use.
1.3 Units—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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C5 Specification for Quicklime for Structural Purposes
C10 Specification for Natural Cement
C91 Specification for Masonry Cement
C119 Terminology Relating to Dimension Stone
C141 Specification for Hydrated Hydraulic Lime for Structural Purposes
C150 Specification for Portland Cement
C207 Specification for Hydrated Lime for Masonry Purposes
C270 Specification for Mortar for Unit Masonry
C1180 Terminology of Mortar and Grout for Unit Masonry
C1242 Guide for Selection, Design, and Installation of Dimension Stone Attachment Systems
C1324 Test Method for Examination and Analysis of Hardened Masonry Mortar
C1489 Specification for Lime Putty for Structural Purposes
C1515 Guide for Cleaning of Exterior Dimension Stone, Vertical And Horizontal Surfaces, New or Existing
1
This guide is under the jurisdiction of ASTM Committee C18 on Dimension Stone and is the direct responsibility of Subcommittee C18.07 on Environmental Properties,
Behavior, and Cleaning.
Current edition approved Nov. 1, 2018March 1, 2023. Published November 2018April 2023. Originally approved in 2011. Last previous edition approved in 20112018
as C1722C1722 – 18.–11. DOI: 10.1520/C1722-18.10.1520/C1722-23.
2
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 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
---------------------- Page: 1 ----------------------
C1722 − 23
C1521 Practice for Evaluating Adhesion of Installed Weatherproofing Sealant Joints
C1707 Specification for Pozzolanic Hydraulic Lime for Structural Purposes
3
2.2 OSHA Directive:
STD 1-12.026 Abrasive Operations Using Cut Off Wheels and Masonry Saws
3. Terminology
3.1 Definitions—For definitions of terms used in this guide, other than those listed below, refer to Terminology C119 and
Terminology C1180.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 defect—defect, n—naturally occuring flaw in the stone.
3.2.2 dimension stone restoration consultant—consultant, n—one who is knowledgeable and experienced with the care,
restoration, and repair of building dimension stone.
3.2.3 distress—distress, n—localized damage of stone units such as cracks, chips, holes, deterioration, bowing, and projections that
have been broken off or worn down caused by wear, erosion, settlement, displacement, or other adverse chemical or mechanical
actions.
3.2.4 dutchman repair—repair, n—a stone repair method whereby a portion of a stone unit is cut out and replaced with another
piece of stone (called a dutchman). The dutchman is usually rectangular or square in shape, but may also be roun
...
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