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Historic Preservation - Technical Procedures

Spectitle:
Replacing Deteriorated Sealant

Procedure code:
0790003R

Source:
National Capitol Region Specifications - 1951 Constitut Ave

Division:
Thermal And Moisture Protection

Section:
Joint Sealers

Last Modified:
02/24/2012

Details:
Replacing Deteriorated Sealant



REPLACING DETERIORATED SEALANT


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing deter= iorated
         or inappropriate sealant and replacing with new sealant
         at appropriate locations.

    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 Precaution= s

         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.   American Society for Testing and Materials (ASTM), 100
         Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
         or FAX (610) 832-9555.


1.03 SUBMITTALS

    A.   Product Data: Submit manufacturer's technical data for
         each type joint sealer required, includi= ng instructions
         for joint preparation and joint sealer application.

    B.   Samples: Submit manufacturer's standard bead sampl= es
         consisting of strips of actual products showing full
         range of colors available, for each product exposed to
         view. Color selection by RHPO.

    C.   Backer Rod Sample: Submit 12" long sample of proposed
         backer rod. Submit certification from sealant
         manufacturer that backer rod is compatib= le with sealant.

1.04 QUALITY ASSURANCE

    A.   Qualifications:

         1.   Installer of sealant work shall have at  least 5
              years experience in the successful installation of
              sealant systems specified for this project.

         2.   If requested by the Contracting Officer, installer
              shall submit a statement describing the firm's
              qualifications, experience of the personnel
              performing the work, and list of successful
              completed projects. Inclu= de the name and address of
              the project owner and of the RHPO.

    B.   Regulatory Requirements: Work of this section shall
         comply with applicable standards indicat= ed.

    C.   Certifications:  Submit written certification from
         sealant manufacturer or manufacturer's representative
         that, after visiting the site and examin= ing the
         conditions and locations where sealant will be installed,
         the sealant specified is correct for the use intended. If
         sealant is not correct for the situation, the
         manufacturer shall submit in writing to the RHPO the
         recommendation for the correct sealant to be used.

    D.   Field Samples:

         1.   Provide products of listed or other approved
              manufacturers. Provide products from single source
              or manufacturer for each product during course of
              the work.

    E.   Mock-Ups:

         1.   Contracting Officer will select a location for
              installer to install a 3 foot section of each
              sealant system specified.=

         2.   After curing and prior to approval of test panel,
              installer shall test adhesion of joint my manually
              trying to pull sealant from joint. Test shall be
              performed in the presence of the Contracting
              Officer and representative of sealant manufacturer.

         3.   Approved test panels shall become an integral part
              of the work and serve as standard for similar work
              on this project.

1.05 DELIVERY, STORAGE AND HANDLING

    A.   Packing and Shipping: Deliver materials to the site in
         original unopened containers or bundles with labels
         informing about manufacturer, product name, color,
         expiration date for use, pot life, curing time and mixing
         instructions for multi-component product= s.

    B.   Store and handle materials to prevent their deteri= oration
         or damage by temperature changes, contam= inants or other
         causes. Remove damaged material from the site to prevent
         use and replace with new material.

1.06 PROJECT/SITE CONDITIONS

    A.   Existing Conditions: Do not proceed with sealant work
         during inclement weather or forecast of inclement
         weather, or when temperature is above or below
         manufacturer's recommended limitations for installation.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Pecora Corporation
         165 Wambold Road
         Harleysville, PA  19438
         800/522-1285 or 215/723-6051
         -or-
         2601 Oakland Avenue
         Garland, TX  75041
         800/523-6688 or 214/278-8158

    B.   Sika Corporation
         201 Polito Ave.
         Lyndhurst, NJ  07071
         201/933-8800

    C.   Sonneborn Building Products

    D.   Tremco, Inc.
         3735 Green Rd.
         Beachwood, OH  44122
         800/321-7906

    E.   Williams Products, Inc.

    F.   Bostik, Inc.
         Bostik Construction Products
         211 Boston St.
         Middleton, MA 01949
         800/726-7845

2.02 MATERIALS

    A.   Exterior sealant to be a non-sag, gun grade, seala= nt
         complying with ASTM C920, such as those manufactured by
         (Pecora Corp.), (Sika Corp.), (Sonneborn Building
         Products), (Tremco, Inc.), or approved equal.  Color
         shall be selected by RHPO from manufactu= rer's full range
         of colors.  See also 07900-01-S for guidance in selecting
         an appropriate sealant.

    B.   Traffic-type sealant for horizontal joints to be non-
         staining, non-sag, sealant complying  with ASTM C920,
         such as those manufactured by (Pecora Corp.), (Sika
         Corp.), (Tremco, Inc.), or approved equal.

    C.   Backer rod to be a closed-cell polyethylene or
         polyurethane rod of diameter recommended by manufacturer
         for opening width; such as "Green Rod" (NMC, Inc.),
         "Chem-Rod/Closed" (Bostik Construction Products Division,
         Emhart), "Sonofoam Closed Cell Backer Rod" (Sonneborn
         Building Products), "Expand-O-Foam&= quot; (Williams Products,
         Inc.), or approved equal.  Verify compatibility of backer
         rod and sealant before installation.

    D.   Joint primer and cleaner shall be as recommended by
         sealant manufacturer for joint surfaces. Contractor shall
         verify with manufacturer need for primer and correct
         product for type of material on which sealant will be
         applied. Manufacturer's literature shall not be used as
         basis for primer requirement.

    E.   Joint filler for traffic sealant joints shall be a
         reconstituted, closed cell sponge neopre= ne, having a
         density of 30 lbs. per cubic foot and conforming to ASTM
         D1752, Type I.

    F.   Bond breaker tape shall be an adhesive backed
         polyethylene tape compatible with sealan= t. Verify with
         sealant manufacturer prior to use.

    G.   Masking tape for protection of materials adjacent to
         joint to be a non-staining, non-absorbent type compatible
         with sealant and surfaces.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Verification of Conditions: Inspect joints to receive
         sealant prior to commencing work for compliance with
         joint requirements, tolerances and other conditions
         affecting sealant performance. Do not proceed with
         sealant installation until corrections or adjustments
         have been made.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Clean out joints to receive sealant of dirt, greas= e, or
         other foreign materials.

    B.   Vacuum or brush joints using non-ferrous brush and blow
         dry.

    C.   Install backer rod where joints are deeper than =AB" or
         bond breaker tape if less than =AB", into joint to provide
         sealant depth recommended by sealant manufacturer. Backer
         rod size shall be selected to allow for a minimum of 30%
         compression of the backing when inserted into the joint.

    D.   Tape shoulders of joint during installation and tooling
         of sealant to aid in the removal of excess sealant and to
         prevent staining of masonry. Remove tape after tooling of
         joint.

    E.   Fill joint completely with sealant in accordance with
         manufacturer's instructions.

    F.   Tool immediately after application to ensure firm, full
         contact with the inner faces of the joint. Finished bead
         shall be smooth, continuous, and slightly concave.

    G.   Clean excess sealant off adjacent surfaces immedia= tely
         after tooling and removal of tape. Do not use any
         cleaners or agents that will stain the sealant or
         adjacent surfaces.

3.03 PROTECTION

    A.   Installer shall instruct the Contractor in the methods to
         be used to cure and protect the sealant from damage
         during construction period, other than normal wear and
         weathering.

    B.   Replace damaged or deteriorated sealants prior to
         completion of the project, and during warranty period of
         product by manufacturer.


                         END OF SECTION