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Historic Preservation - Technical Procedures

Spectitle:

Replacing Damaged Encaustic Floor Tiles

Procedure code:

0930001R

Source:

Us Custom House/Po/St. Louis, Mo - Gsa/Pbs, 10-15-79

Division:

Finishes

Section:

Tile

Last Modified:

11/19/2014

Details:

Replacing Damaged Encaustic Floor Tiles



REPLACING DAMAGED ENCAUSTIC FLOOR TILES


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing and
         replacing damaged or deteriorated encaustic floor tiles.
         Replacement may involve using tile salvaged from other
         locations or reproducing tile to match the existing tile.

    B.   For additional information on the characteristics, uses
         and the production/reproduction process of encaustic
         tiles, see 09310-02-S.

    C.   See 01100-07-S for general project guidelines to be used
         along with this procedure.  These guidelines cover the
         following sections:

         1.   Historic Structures Precautions

         2.   Submittals

         3.   Quality Assurance

         4.   Delivery, Storage and Handling

         5.   Project/Site Conditions

         6.   Sequencing and Scheduling

         7.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed along with
         recommendations from the Regional Historic Preservation
         Officer (RHPO).

1.02 REFERENCES

    A.   The Tile Council of North America, Inc. (TCNA),
         www.TCNATILE.com


    B.   American National Standards Institute, Inc. (ANSI), 
         www.ansi.org 

1.03 SYSTEM DESCRIPTION

    A.   Performance Requirements:  Completed encaustic tile
         installation to be within tolerances as follows:

         1.   Variation from a true plane not to exceed 3/16" in
              10'-0", any direction, but not more than 3/8" for
              total length.

         2.   Variation in offset of edge-to-edge alignment of
              adjoining tile not to exceed 1/32".

1.04 SUBMITTALS

    A.   Product Data:  Submit manufacturer's technical
         information and installation instructions for all
         materials required, except bulk materials.  Include
         certifications and other data as may be required to show
         compliance with this specification.

1.05 QUALITY ASSURANCE

    A.   Manufacturing Standards:

         1.   When using setting and grouting materials
              manufactured under TCNA license, include
              identification and formula number on each
              container.

         2.   Provide materials obtained from only one source for
              each type to minimize variations in appearance and
              quality.

    B.   Mock-Ups:  A representative sample area as indicated of
         100 square feet will be restored.  Obtain acceptance of
         the sample area before proceeding with the remainder of
         the restoration.  Maintain sample area in its accepted
         condition until acceptance of completed work.

1.06 DELIVERY, STORAGE AND HANDLING

    A.   Packing and Shipping:  Deliver packaged materials and
         store in original containers with seals unbroken and
         labels intact until time of use, in accord with
         directions of manufacturer.

1.07 PROJECT/SITE CONDITIONS

    A.   Environmental Requirements:  Maintain a temperature of
         not less than 50 degrees F. during tile installation and
         for 7 days after completion.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Tile:  Encaustic tile to match existing in color, shape
         and size.  Existing tile from other areas of the building
         may be used after cleaning and evaluaton for soundness
         and compatibility.

    B.   Mortar and Grout:

         1.   Latex-Portland Cement Mortar:  Latex modified
              portland cement thin-set mortar complying with ANSI
              A118.4.

         2.   Latex-Portland Cement Grout:  Proprietary compound
              composed of portland cement with latex additive for
              a more flexible and less permeable grout.  Color to
              match existing grout.

         3.   Epoxy Patch Compound:  Two component resin and
              hardener complying with ANSI A118.3.  Colors to
              match existing tiles.

         4.   Epoxy Mortar:  Two-component epoxy resin and
              hardener; ANSI A118.3.

         5.   Water:  Clean and free of deleterious materials
              which would impair strength, bond or appearance.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Examine the substrate and the conditions under which tile
         is to be installed.  Do not proceed with the work until
         unsatisfactory conditions have been corrected, which
         includes a level and even bedding for new work.

3.02 PREPARATION

    A.   Surface Preparation:

         1.   Areas of existing tile indicated to be removed and
              reused shall be carefully loosened from the
              substrate, cleaned and stored for use as
              replacement tile.

         2.   Cracked, crumbled or shattered tile shall be
              carefully removed in such a manner so as not to
              damage in any way nor to dislocated any adjacent
              tiles.

         3.   Pitted tile shall be carefully repaired with epoxy
              patch compound to produce a smooth even surface and
              to completely fill existing surface voids.

3.03 ERECTION, INSTALLATION, APPLICATION

    A.   Before installing new tile, carefully examine exposed
         substrate.

         1.   If substrate is found to be solid and a sound
              surface for new work, install new tile with epoxy
              mortar.

         2.   If substrate is NOT found to provide a sound
              surface for the new work, provide applicable tile
              installation method for substrate and performance
              as described below and complying with TCNA "Handbook
              for Ceramic, Glass, and Stone Tile Installation".

    B.   Install New Tiles:

         NOTE:  COMPLY WITH APPLICABLE ANSI STANDARD INSTALLATION
         SPECIFICATIONS.

         1.   Use a Latex-Portland Cement Mortar:  Latex modified
              portland cement thin-set mortar; ANSI A118.4.

         2.   Joint Pattern:  Unless otherwise indicated, lay
              tile in exact configuration as the removed tile.
              Align joints and provide uniform joint widths.

         3.   Colors and Existing Pattern:  When new replacement
              tile or tiles are installed, the colors and
              locations of the tiles must exactly duplicate and
              match the removed original(s).

         4.   Coverage:  Extend tile work into recesses and under
              equipment and fixtures, to form a complete covering
              without interruptions, except as otherwise
              indicated.  Terminate work neatly at obstructions,
              edges and corners without disruption of pattern or
              joint alignment, and use applicable trim and
              special shapes as required.

         5.   Fitting:  Accurately form intersections and
              returns, and use applicable special shapes as
              required.  Perform cutting of tile without marring
              visible surfaces.  Carefully grind cut edges of
              tile abutting trim, finish or built-in items for
              straight, aligned joints.  Fit tile closely to
              electrical outlets, piping and fixtures so that
              plates, collars or covers overlap tile.

         6.   Setting Beds:  Provide applicable setting bed types
              as required.  Handle and apply proprietary mortar
              materials complying with instructions of the
              manufacturer.

         7.   Setting Tile:  Set encaustic tile in place, and
              tamp level and even with adjacent tile and within
              required tolerances.  Use appropriate spacers to
              obtain a straight and uniform joint.

         8.   Grouting:  Provide applicable grout types as
              required.  Handle and apply grout complying with
              instructions of manufacturer.  Start grouting after
              the  setting bed mortar has cured and tiles are
              firm and secure in-place.

3.04 ADJUSTING/CLEANING

    A.   Clean grout and setting materials from face of tile while
         materials are workable.  Leave tile face clean and free
         of all foreign matter.  DO NOT USE ACID OR CAUSTIC
         MATERIALS TO CLEAN TILE.

    B.   Leave restored areas clean and free of cracked, chipped,
         broken, unbonded or otherwise defective tile.

3.05 PROTECTION

    A.   Install a protective covering to protect the floor during
         the construction period.

    B.   Prohibit all foot and wheel traffic from using tiled
         floors for at least 3 days, preferably 7 days.

    C.   Before final inspection, remove protective covering clean
         and rinse all tile surfaces.  Wash tile surfaces clean.

                         END OF SECTION
 


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