Historic Preservation - Technical Procedures
Replacing Deteriorated Sealant
National Capitol Region Specifications - 1951 Constitut Ave
Thermal And Moisture Protection
Replacing Deteriorated Sealant
REPLACING DETERIORATED SEALANT
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
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).
A. American Society for Testing and Materials (ASTM), 100
Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
or FAX (610) 832-9555.
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
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
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.
A. Pecora Corporation
165 Wambold Road
Harleysville, PA 19438
800/522-1285 or 215/723-6051
2601 Oakland Avenue
Garland, TX 75041
800/523-6688 or 214/278-8158
B. Sika Corporation
201 Polito Ave.
Lyndhurst, NJ 07071
C. Sonneborn Building Products
D. Tremco, Inc.
3735 Green Rd.
Beachwood, OH 44122
E. Williams Products, Inc.
F. Bostik, Inc.
Bostik Construction Products
211 Boston St.
Middleton, MA 01949
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.
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
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
E. Fill joint completely with sealant in accordance with
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
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
B. Replace damaged or deteriorated sealants prior to
completion of the project, and during warranty period of
product by manufacturer.
END OF SECTION