ASTM C1722-11
(Guide)Standard Guide for Repair and Restoration of Dimension Stone
Standard Guide for Repair and Restoration of Dimension Stone
SIGNIFICANCE AND USE
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.
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.
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 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 requirements prior to use.
General Information
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C1722 − 11
Standard Guide for
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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 C1324 Test Method for Examination and Analysis of Hard-
ened Masonry Mortar
1.1 This guide describes materials and procedures for re-
C1329 Specification for Mortar Cement
storing facades constructed of or finished with dimension
C1489 Specification for Lime Putty for Structural Purposes
stone. All of the materials, procedures, and principles are
C1515 Guide for Cleaning of Exterior Dimension Stone,
suitable for restoration of historic and nonhistosric structures.
Vertical And Horizontal Surfaces, New or Existing
1.2 This guide is not intended to address restoration of
C1521 Practice for EvaluatingAdhesion of Installed Weath-
interior dimension stone, although many of the materials and
erproofing Sealant Joints
procedures may be suitable for interior use.
2.2 OSHA Directive:
1.3 The values stated in inch-pound units are to be regarded
STD 1-12.026 Abrasive Operations Using Cut Off Wheels
as standard. The values given in parentheses are mathematical
and Masonry Saws
conversions to SI units that are provided for information only
and are not considered standard.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions—For definitions of terms used in this guide,
safety concerns, if any, associated with its use. It is the
other than those listed below, refer to Terminology C119 and
responsibility of the user of this standard to establish appro-
Terminology C1180.
priate safety and health practices and determine the applica-
3.2 Definitions of Terms Specific to This Standard:
bility of regulatory requirements prior to use.
3.2.1 defect—naturally occuring flaw in the stone.
3.2.2 dimension stone restoration consultant—one who is
2. Referenced Documents
2 knowledgeable and experienced with the care, restoration, and
2.1 ASTM Standards:
repair of building dimension stone.
C5 Specification for Quicklime for Structural Purposes
3.2.3 distress—localized damage of stone units such as
C10 Specification for Natural Cement
cracks, chips, holes, deterioration, bowing, and projections that
C91 Specification for Masonry Cement
have been broken off or worn down caused by wear, erosion,
C119 Terminology Relating to Dimension Stone
settlement, displacement, or other adverse chemical or me-
C141 Specification for Hydraulic Hydrated Lime for Struc-
chanical actions.
tural Purposes
C150 Specification for Portland Cement
3.2.4 dutchman repair—a stone repair method whereby a
C207 Specification for Hydrated Lime for Masonry Pur-
portion of a stone unit is cut out and replaced with another
poses
piece of stone (called a dutchman). The dutchman is usually
C270 Specification for Mortar for Unit Masonry
rectangular or square in shape, but may also be rounded, and is
C1180 Terminology of Mortar and Grout for Unit Masonry
usually at a corner or edge of the stone unit.
C1242 Guide for Selection, Design, and Installation of
3.2.5 pointing—placing mortar in the outer portion of the
Dimension Stone Attachment Systems
joints between stone units. To point stone joints, the outer
portion of the joints must either be left open during installation
or cut or ground out, i.e. have the mortar removed from the
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This guide is under the jurisdiction of ASTM Committee C18 on Dimension outer portion of the joint. New mortar is then pressed into the
Stone and is the direct responsibility of Subcommittee C18.07 on Environmental
jointwithapointingtool.Theincreasedcompactionofthenew
Properties, Behavior, and Cleaning.
mortar provides an improved resistance to water penetration at
Current edition approved Oct. 1, 2011. Published November 2011. DOI:
the joint compared to the primary stone setting mortar.
10.1520/C1722-11.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.5.1 repointing—the removal of existing mortar from the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
outer portion of the joints between stone units and the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. subsequent pointing of the joints.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1722 − 11
3.2.5.2 tuck pointing (tuckpointing, tuck-pointing)—this a result of structural instability, that structural issue must be
term is intentionally no
...
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