Patching Cracks in Brick Masonry
- Procedure code:
- National Capitol Region Specifications
- Brick Unit Masonry
- Last Modified:
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PATCHING CRACKS IN BRICK MASONRY
A. This procedure includes guidance on repairing cracks or infilling small holes in brick masonry using a cementitious patching material.
B. See 01100-07-S for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:
1. Safety Precautions
2. Historic Structures Precautions
4. Quality Assurance
5. Delivery, Storage and Handling
6. Project/Site Conditions
7. Sequencing and Scheduling
8. General Protection (Surface and Surrounding)
These guidelines should be reviewed prior to performing this procedure and should be followed, when applicable, along with recommendations from the Regional Historic Preservation Officer (RHPO).
A. Jahn Restoration Techniques and Research (Cathedral Stone Company)
B. Edison Chemical Systems, Inc.
A. Cementitious patching material such as "M70 Stone Restoration Mortar" (Jahn Restoration), "Custom System 45" Edison Chemical Systems), or approved equal.
B. Clean, soft cloths
C. Clean, potable water
A. Stiff natural bristle brushes
E. Putty knife
3.01 ERECTION, INSTALLATION, APPLICATION
A. Remove all loose materials from cracked brickwork.
B. Widen crack to 1/8" wide and grout crack and any voids with a cementitious grout that is color matched to clean brick. The grout should be compatible in texture and porosity to the adjacent masonry. Tape joint to provide
a clean neat finished appearance.
C. Severely cracked brick associated with displaced masonry should be dismantled. Probe interior conditions and repair following an engineer's evaluation. Rebuild brickwork to match existing bonding patterns and use
salvaged brick where possible and new brick to match existing color, texture and porosity.