Specifications - Lord and Son Construction, Inc.

PART 3 – EXECUTION
3.1 PRECONSTRUCTION FIELD-ADHESION TESTING
A. Before installing sealants, field test their adhesion to Project joint substrates. Test
joint sealants according to Method A, Field-Applied Sealant Joint Hand Pull Tab, in
Appendix X1 in ASTM C 1193 or Method A, Tail Procedure, in ASTM C 1521.
3.2 EXAMINATION
A. Inspect substrate surface to assure that no bond breaker materials contaminate
the surface to which the sealant is to adhere and to ensure that unsound
substrates are repaired. Installation of sealant shall be evidence of acceptance of
the substrate.
B. Verify joint dimensions prior to installation of the sealant to ensure that all
dimensions are within tolerance established in the manufacturer's literature.
Unacceptable variations shall be called to the Contracting Officer’s attention for
resolution prior to installing any material.
3.3 PREPARATION
A. Clean joint surfaces immediately before installation of sealant or caulking
compound. Remove dirt, insecure coatings, moisture and other substances which
could interfere with bond of sealant or caulking compound. Etch concrete and
masonry joint surfaces as recommended by sealant manufacturer.
B. Prime or seal joint surfaces where indicated, and where not indicated if
recommended by sealant manufacturer, prior to installation of any backer rod or
bond breaker tape. Do not allow primer/sealer to spill or migrate onto adjoining
surfaces.
3.4 INSTALLATION
A. General: Comply with manufacturer's printed instructions, except where more
stringent requirements are shown or specified, and except where manufacturer's
technical representative directs otherwise.
B. Set joint filler units full depth of joint or position in joint to coordinate with other
work, including installation of backer rods and sealants. Do not leave voids or
gaps between ends of joint filler units.
C. Install sealant backer rod for liquid elastomeric sealants, except where shown to
be omitted or recommended to be omitted by sealant manufacturer for application
indicated in which case a bond breaker tape shall be used to prevent 3 sided
adhesion. Apply backer rod using blunt or rounded tools which will ensure a
uniform depth without puncturing the material. Use a rod oversized a minimum of
33% for closed cell and 50% for open cell, unless otherwise required by the
manufacturer.
MAHG121038 07 92 00 - 3 JOINT SEALANTS