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"Repointing Mortar Joints" an Historic Preservation Brief November 21, 2008


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Repointing Mortar Joints
in Historic Masonry Buildings

Robert C. Mack, FAIA, and John P. Speweik
Repointing Mortar Joints

What's in this article



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Introduction

Historical Background

        Portland Cement

        Masonry cement

Identifying the Problem Before Repointing

        Use of Consultants

Finding an Appropriate Mortar Match

Mortar Analysis

Properties of Mortar

Components of Mortar

        Sand

        Lime

        Lime putty

        Portland cement

        Masonry cement

        Lime mortar

        Water

        Historic Components

        Pigments

        Modern components

Mortar Type and Mix

Budgeting and Scheduling

Contractor Selection

Execution of the Work

        Test Panels

        Joint Preparation

        Mortar Preparation

        Using Lime Putty to Make Mortar

        Filling the Joint

        Curing Conditions

        Aging the Mortar

        Cleaning the Repointed Masonry

        Surface Grouting

Visually Examining the Mortar and the Masonry Units

Other Factors to Consider

        Color

        Pointing Style

              Tuckpointing

              Penciling

        Masonry Units

        Matching Color and Texture of the Repointing Mortar

Summary

        For the Owner/Administrator

        For the Architect/Consultant

        For the Masons

Conclusion

Selected Reading

Useful Addresses

Acknowledgments


Return to the Knowledge Base

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Selected Reading

Ashurst, John & Nicola. Practical Building Conservation. Vol. 3: Mortars, Plasters and Renders. New York: Halsted Press, a Division of John Wiley & Sons, Inc., 1988.

Cliver, E. Blaine. "Tests for the Analysis of Mortar Samples." Bulletin of the Association for Preservation Technology. Vol. 6, No. 1 (1974), pp. 68-73.

Coney, William B., AIA. Masonry Repointing of Twentieth-Century Buildings. Illinois Preservation Series. Number 10. Springfield, IL: Division of Preservation Services, Illinois Historic Preservation Agency, 1989.

Davidson, J.I. "Masonry Mortar." Canadian Building Digest. CBD 163. Ottawa, ONT: Division of Building Research, National Research Council of Canada, 1974.

Ferro, Maximillian L., AIA, RIBA. "The Russack System for Brick and Mortar Description: A Field Method for Assessing Masonry Hardness." Technology and Conservation. Vol. 5, No. 2 (Summer 1980), pp. 32-35.

Hooker, Kenneth A. "Field Notes on Repointing." Aberdeen's Magazine of Masonry Construction. Vol. 4, No. 8 (August 1991), pp. 326-328.

Jedrzejewska, H. "Old Mortars in Poland: A New Method of Investigation." Studies in Conservation. Vol. 5, No. 4 (1960), pp. 132-138.

"Lime's Role in Mortar." Aberdeen's Magazine of Masonry Construction. Vol. 9, No. 8 (August 1996), pp. 364-368.

Phillips, Morgan W. "Brief Notes on the Subjects of Analyzing Paints and Mortars and the Recording of Moulding Profiles: The Trouble with Paint and Mortar Analysis." Bulletin of the Association for Preservation Technology. Vol. 10, No. 2 (1978), pp. 77-89.

Preparation and Use of Lime Mortars: An Introduction to the Principles of Using Lime Mortars. Scottish Lime Centre for Historic Scotland. Edinburgh: Historic Scotland, 1995.

Schierhorn, Carolyn. "Ensuring Mortar Color Consistency." Aberdeen's Magazine of Masonry Construction. Vol. 9, No. 1 (January 1996), pp. 33-35.

"Should Air-Entrained Mortars Be Used?" Aberdeen's Magazine of Masonry Construction. Vol. 7, No. 9 (September 1994), pp. 419-422.

Sickels-Taves, Lauren B. "Creep, Shrinkage, and Mortars in Historic Preservation." Journal of Testing and Evaluation, JTEVA. Vol. 23, No. 6 ( November 1995), pp. 447-452.

Speweik, John P. The History of Masonry Mortar in America, 1720-1995. Arlington, VA: National Lime Association, 1995.

Speweik, John P. "Repointing Right: Why Using Modern Mortar Can Damage a Historic House." Old-House Journal. Vol. XXV, No. 4 (July-August 1997), pp. 46-51.

Technical Notes on Brick Construction. Brick Institute of America, Reston, VA.

"Moisture Resistance of Brick Masonry: Maintenance." 7F. February 1986.

"Mortars for Brick Masonry." 8 Revised II. November 1989.

"Standard Specification for Portland Cement-Lime Mortar for Brick Masonry." 8A Revised. September 1988.

"Mortar for Brick Masonry-Selection and Controls." 8B Reissued. September 1988. (July/August 1976).

"Guide Specifications for Brick Masonry, Part V Mortar and Grout." 11E Revised. September 1991.

"Bonds and Patterns in Brickwork." 30 Reissued. September 1988.

Useful Addresses

Brick Institute of America
11490 Commerce Park Drive
Reston, VA 22091

National Lime Association
200 N. Glebe Road, Suite 800
Arlington, VA 22203

Portland Cement Association
5420 Old Orchard Road
Skokie, IL 60077


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