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Historic Preservation - Technical Procedures

Spectitle:

Removing And Replacing Damaged Marble Veneer

Procedure code:

0445504R

Source:

Tacoma Union Station Courthouse/Tacoma, Wa - Gsa/Pbs

Division:

Masonry

Section:

Marble

Last Modified:

06/20/2012

Details:

Removing And Replacing Damaged Marble Veneer



REMOVING AND REPLACING DAMAGED MARBLE VENEER


THIS PROCEDURE SHOULD BE PERFORMED UNDER THE DIRECTION OF AN
HISTORICAL ARCHITECT OR ENGINEER TO DETERMINE THE MOST EFFICIENT
AND LEAST DESTRUCTIVE MANNER FOR EXECUTING THE WORK.  APPROVAL
FROM
THE REGIONAL HISTORIC PRESERVATION OFFICER IS REQUIRED.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing damaged
         pieces of marble veneer and replacing with new to match
         existing.

    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).

1.02 REFERENCES

    A.   Applicable Publications:  The following publications of
         the issues listed below, but referred to thereafter by
         basic designation only, form a part of this specification
         to the extent indicated by the references thereto:

         1.   American Society for Testing and Materials (ASTM),
              www.astm.org

              a.   C119-71 - Definition of terms relating to
                   natural building stone.

              b.   C-241-51 - Test for abrasion resistance of
                   stone subjected to foot traffic.

         2.   American National Standard Institute (ANSI)
              www.ansi.org

              a.   A-94.1 - Standard specification for interior
                   marble.

         3.   Marble Institute of America (MIA)
               www.marble-institute.com


              a.   "Dimension Stone, Design Manual IV"

1.03 SUBMITTALS

    A.   Shop Drawings:  Submit cutting and setting drawings
         showing sizes, dimensions, sections and profiles of
         marble units, arrangement and provisions of jointing,
         anchoring and fastening, supports and other necessary
         details for lifting devices and reception of other work.
         Indicate location of each unit of marble on setting
         drawings with number designation corresponding to number
         marked on each unit.

         1.   Show location of inserts (for marble anchors and
              supports) which are to be built into concrete or
              masonry substrate.

    B.   Samples:  Submit 3 sets of samples, not less than 12" x
         12" x 1/4" of each different color, grade and finish of
         marble required.  Include in each set the full range of
         exposed color and texture to be expected in completed
         work.

1.04 DELIVERY, STORAGE AND HANDLING

    A.   Acceptance at Site:  Handle marble to prevent chipping,
         breakage, soiling or other damage.  Do not use pinch or
         wrecking bars without protecting edges of marble with
         wood or other rigid materials.  Lift with wide-belt type
         slings wherever possible; do not use wire rope or ropes
         containing tar or other substance which might cause
         staining.  If required, use wood rollers and provide
         cushion at end of wood slide.

    B.   Storage and Protection:

         1.   Protect marble, mortar materials and accessories
              during storage and construction against moisture,
              soiling, staining and physical damage.

         2.   Store marble on wood skids or pallets, covered with
              non-staining, waterproof membrane.  Place and stock
              skids and stones to distribute weight evenly and to
              prevent breakage or cracking of marble.  Protect
              stored marble from weather with waterproof,
              nonstaining covers or enclosures, but allow air to
              circulate around marble.

         3.   Handle marble to prevent chipping, breakage,
              soiling or other damage.  Do not use pinch or
              wrecking bars without protecting edges of marble
              with wood or other rigid materials.  Lift with
              wide-belt type slings wherever possible; do not use
              wire rope or ropes containing tar or other
              substances which might cause staining.  If
              required, use wood rollers and provide cushion at
              end of wood slide.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Marble Materials:  Of color, finish, size, and type to
         match existing.

    B.   Setting Materials:

         1.   Portland Cement: ANSI/ASTM C 150, Type I, except
              complying with staining requirements of ASTM C 91
              for not more than 0.03% water soluble alkali.

         2.   Hydrated Lime:  ANSI/ASTM C 207, Type I.

         3.   Sand:  ANSI/ASTM C 144, non-staining, except graded
              with 100% passing the No. 166 sieve for 1/4" and
              narrower joints.

              a.   For white pointing mortar and grout, furnish
                   natural white sand or ground white stone
                   complying with specified requirements.

              b.   For colored pointing mortar and grout, furnish
                   ground marble, granite or other sound stone,
                   meeting specified grading requirements for
                   sand, of color required to match existing
                   mortar and grout color.

         4.   Water:  Potable, clear and not of   Clean and
              potable, free of oils, acids, alkalis, salts,
              organic matter or other deleterious materials which
              would impair the work.

         5.   Dry-Set Mortar:  Factory-sanded Portland cement and
              additives complying with ANSI A 118.1, of type
              approved by mortar manufacturer and marble supplier
              for application indicated.

         6.   Molding Plaster:  ANSI/ASTM C 59.

    C.   Marble Accessories:

         1.   Anchors, Dowels or Cramps:  Fabricate from
              corrosion resistant metals.  Special cramps,
              dowels, and the like shall be used where shown on
              shop drawings but elsewhere #12 stubs gage half
              hard yellow brass wire anchors shall be used.  It
              shall be the responsibility of the Contractor to
              anchor all marble pieces securely.  In general, for
              standing marble, the following practices usually
              prevail:

              a.   A minimum of 2 anchors shall be required on
                   all pieces up to 2 square feet in area.

              b.   A minimum of 4 anchors shall be required on
                   all pieces 2 square feet to 20 square feet in
                   area.

              c.   A minimum of 2 additional anchors shall be
                   required for each additional 10 square feet on
                   pieces above 20 square feet.

         2.   Setting Buttons:  Lead or plastic buttons of
              thickness required for joint size indicated and of
              size required to maintain uniform joint width.


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:  Protect surrounding surfaces of building
         from damage resulting from marble restoration work.

    B.   Protect marble surfaces during construction period with
         Kraft paper or other heavy covering of type that will not
         stain or discolor marble.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Stone fabrication shall be in accordance with the
         applicable publications listed in Part 1.  Fabrication
         shall include surface tolerances, dimensions and
         finishes.

    B.   Marble shall have setting number on the back or on an
         unexposed edge that corresponds with the number on the
         approved shop drawings.

    C.   Backs of pieces shall be sawn or roughly dressed so that
         maximum variation in thickness from that required shall
         not exceed 1/4".

    D.   Cutting for work of other trades shall be done neatly and
         accurately to the required size.

    E.   Marble installation shall be in accordance with the
         publications listed in Part 1 applicable to the specified
         stone.  For details and stone types not otherwise
         covered, erection shall be in accordance with the listed
         publications for marble.  Erection shall include the
         mechanical anchorage system, jointing, setting, anchors
         and dowels, pointing protection and cleaning.

    F.   Remove all deteriorated or damaged wall pieces as
         directed by RHPO.  Remove all non-original material
         including non-matching patches.  Remove existing setting
         buttons and prepare substrate material as required to
         insure proper installation of new pieces.

    G.   Erect new facing stones and trim plumb and true with
         joints uniform in width and accurately aligned.  Provide
         setting buttons as required to maintain joint width.

         1.   Set marble units firmly against plaster spots
              located at or near the anchors and spaced not
              further than 18" apart over the back of the piece,
              unless otherwise indicated.

    H.   Point joints after setting with pointing mortar to match
         color of existing mortar or to match color of marble.
         Color of marble shall be established in mock-ups.  Mix in
         proportions of 1 part Portland cement, 1 part lime, and
         3 parts sand; unless otherwise indicated.  Rub joints
         smooth with plastic tool.

3.03 ADJUSTING/CLEANING

    A.   Epoxy patch existing marble units which become chipped or
         cracked during execution of this procedure.  For guidance
         on repair of marble using epoxies see 04455-03-R.

    B.   Before final inspection, remove protective covering and
         reclean any soiled surfaces.  For guidance on specific
         cleaning procedures see 04455-02-R and 04455-06-R.

                         END OF SECTION
 


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