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Historic Preservation - Technical Procedures

Spectitle:
Patching Cracks In Brick Masonry

Procedure code:
0421103R

Source:
National Capitol Region Specifications

Division:
Masonry

Section:
Brick Unit Masonry

Last Modified:
02/24/2012

Details:
Patching Cracks In Brick Masonry



PATCHING CRACKS IN BRICK MASONRY


PART 1---GENERAL

1.01 SUMMARY

    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

         3.   Submittals

         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).  


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Jahn Restoration Techniques and Research
         Cathedral Stone Company
         2505 Reed Street, NE
         Washington, DC 20018

    B.   Edison Chemical Systems, Inc.
         25 Grant Street
         Waterbury, CT 06704
         203/597-9727

2.02 MATERIALS

    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

2.03 EQUIPMENT

    A.   Stiff natural bristle brushes

    B.   Trowel

    C.   Chisel

    D.   Hammer

    E.   Putty knife


PART 3---EXECUTION

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.

                         END OF SECTION