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Repointing Mortar Joints in Historic Masonry Buildings
Preservation Briefs 2, National Park Service, U.S. Department of the Interior
Robert C. Mack, FAIA, and John P. Speweik
Initially transcribed for the Web by John C. Leeke, Historic Homeworks

 

 

• Examples
• Architectural Conservation Audit • Case Studies
• John C. Leeke, Historic Homeworks.

Table of Contents

    Introduction

    1. Historical Background
    2. Identifying the Problem Before Repointing
    3. Finding an Appropriate Mortar Match
    4. Mortar Analysis
    5. Properties of Mortar
    6. Components of Mortar
      1. Sand
      2. Lime
      3. Portland cement
      4. Masonry cement
      5. Lime mortar (pre-blended)
      6. Water
      7. Other Components
        1. Historic components
        2. Pigments
        3. Modern components
    7. Mortar Type and Mix
    8. Budgeting and Scheduling
    9. Contractor Selection
    10. Execution of the Work
      1. Test Panels
      2. Joint Preparation
      3. Mortar Preparation
      4. Using Lime Putty to Make Mortar
      5. Filling the Joint
      6. Curing Conditions
      7. Aging the Mortar
      8. Cleaning the Repointed Masonry
      9. Surface Grouting
    11. Visually Examining the Mortar and the Masonry Units
    12. Other Factors to Consider
      1. Color
      2. Pointing Style
      3. Masonry Units
    13. Matching Color and Texture of the Repointing Mortar
    14. Summary
      1. For the Owner/Administrator
      2. For the Architect/Consultant
      3. For the Masons
    15. Conclusion
    16. Selected Reading
    17. Acknowledgements