Replacing Damaged Or Missing Marble Baseboards

Technical Procedures Disclaimer

Prior to inclusion in GSA’s library of procedures, documents are reviewed by one or more qualified preservation specialists for general consistency with the Secretary of Interior Standards for rehabilitating historic buildings as understood at the time the procedure is added to the library. All specifications require project-specific editing and professional judgement regarding the applicability of a procedure to a particular building, project or location. References to products and suppliers are to serve as a general guideline and do not constitute a federal endorsement or determination that a product or method is the best or most current alternative, remains available, or is compliant with current environmental regulations and safety standards. The library of procedures is intended to serve as a resource, not a substitute, for specification development by a qualified preservation professional.


We’ve reviewed these procedures for general consistency with federal standards for rehabilitating historic buildings and provide them only as a reference. Specifications should only be applied under the guidance of a qualified preservation professional who can assess the applicability of a procedure to a particular building, project or location. References to products and suppliers serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or method is the best alternative or compliant with current environmental regulations and safety standards.



  1. This procedure includes guidance on replacing damaged or missing sections of marble baseboards to match original and existing surrounding marble.
  2. 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).


  1. American Society for Testing and Materials (ASTM)
  2. American National Standards Institute, Inc. (ANSI)



  1. Bostik 
  2. Custom Building Products
  3. Hillyard, Inc.
  4. Mapei Corporation
  5. H.B. Fuller Co.


  1. New marble to match existing surrounding marble complying with ASTM C97-47.
  2. Dry-set mortar such as "Granirapid" Fast-curing, two-component mortar (Mapei Corporation), "VersaBond Fortified Thin-set Mortar" (Custom Building Products), "Tilemate Premium #710 (white)" (Bostik), or approved equal.
    1. Complying with ANSI A118.1.
    2. Installation should conform with A108.5
  3. C. Cleaning Solution for Marble: Mix 1/8 cup soft soap such as "Ivory Liquid" (Procter & Gamble), 1 quart distilled warm water, and 1/8 cup household ammonia.
    1. Measure materials by volume
    2. Mix ingredients in a clean container (non-metallic)
  4. Marble Polish such as "Onex-Seal II" (Hillyard,
  5. Inc.), or approved equal.
  6. Clean, potable water
  7. . Clean, soft cloths


  1. Chisel
  2. Rubber mallet
  3. Sponges
  4. Trowel
  5. Stiff, fiber bristle brush



  1. Remove and Replace Damaged Marble:
    1. Remove existing mortar and clean all areas to be patched. Remove dust and debris from the area using a stiff, fiber bristle brush.
    2. Cut back damaged marble to sound stonework.
    3. Cut replacement marble to fit uniformly using the smallest joints possible. Marble should match original and existing surrounding marble closely in color, thickness and texture in overall appearance. Wherever possible, use existing matching marble which may have been stockpiled in the building from previous work.
    4. Set marble piece in dry-set mortar following manufacturer's instructions. Do not extend mortar beyond edge of patch area.
    5. While the mortar is still soft and plastic, adjust new piece as necessary into its final location.
    6. Remove any excess mortar from the face of adjacent surfaces.
    7. Repair any adjacent surfaces that may have been damaged during the repair work.
    8. Support new marble pieces with boards to secure them in place until the mortar has cured.
  2. B. Clean and Polish the Marble:
    1. Apply cleaning solution using a clean cloth or sponge. Wash in small overlapping areas.
    2. Rinse cleaned area with clean, clear water by wiping the surface with a soft cloth.
    3. Dry the surface using a clean chamois or soft, dry cloth.
    4. Repolish any areas where polish is damaged or worn off.