BACKERSEAL by EMSEAL
Preformed, Pre-Compressed, Self-Expanding, Sealant System
Watertight, Energy-Efficient, Exterior and Interior Above Grade Wall Joints
PART 1 – GENERAL
accordance with the details shown on the plans and the requirements of the
specifications. Preformed sealant shall be preformed, pre-compressed, self-
expanding, sealant system.
Division 4 - Masonry
Division 7 - Thermal & Moisture Protection
Division 7 - Sealants, Caulking and Waterproofing
Standard Submittal Package – Submit typical expansion joint drawing(s) indicating
pertinent dimensions, general construction, expansion joint opening dimensions and
All products must be certified by independent test report to exceed the requirements
of curtain wall performance tests ASTM E330, E283-04, and E331.
All products must be certified by independent laboratory test report to ASTM E90-09
and to meet or exceed an STC 53 in STC 68 wall and OITC 49 rating in an OITC 52
for 3 hours while compressed down to the minimum of movement capability dimension
of the basis of design product (-25% of nominal material size) without evidence of any
bleeding of impregnation medium from the material; and b) that the same material
after the heat stability test and after first being cooled to room temperature will
subsequently self-expand to the maximum of movement capability dimension of the
basis-of-design product (+25% of nominal material size) within 24 hours at room
temperature 68°F (20°C).
Product Delivery, Storage and Handling
and protect as necessary to prevent damage or deterioration during shipment,
handling and storage. Store in accordance with manufacturer’s installation
Basis of Design
BACKERSEAL product as manufactured by: (USA & International) EMSEAL JOINT
SYSTEMS, LTD 25 Bridle Lane, Westborough, MA 01581-2603, Toll Free: 800-526-
Toll Free: 800-526-8365. www.emseal.com
design criteria and must submit certified performance test reports performed by
nationally recognized independent laboratories as called for in section 1.02 Submittals.
Submittal of alternates must be made three weeks prior to bid opening to allow proper
trades involved in the treatment of work at and around expansion joints including, but
not limited to, concrete, mechanical, electrical, HVAC, landscaping, masonry, curtain
wall, waterproofing, fire-stopping, caulking, flooring and other finish trade
subcontractors. All superintendents and foremen with responsibility for oversight and
setting of the joint gap must attend this meeting. The General Contractor is
responsible to coordinate and schedule all trades and ensure that all subcontractors
understand their responsibilities in relation to expansion joints and that their work
cannot impede anticipated structural movement at the expansion joints, or
compromise the achievement of watertighness or life safety at expansion joints in any
Warranty – Manufacturer’s standard warranty shall apply.
LEED Building Performance Requirements:
Products must be proved to be certified by independent test report to exceed the
Product must meet or exceed hurricane-force wind loading with no deflection at
both positive and negative pressures up to 4954 Pascals—equal to 200 mph winds
(ASTM E330-02-procedure A).
Products must be proved to have been certified by independent test report in
of depth of not less than 1.8 at as-installed nominal joint size compression.
Products must be proved to have been certified by independent test report to
PART 2 – PRODUCT
Provide watertight, energy-efficient exterior and interior joints in vertical-plane walls
(above-grade). Typical locations include, but are not limited to the following:
applications in window perimeters, other façade penetrations such as doors, store
fronts, vents, HVAC units, panel to panel joints, curtain walls, control joints, between
dissimilar materials, and new-to-existing connections.
indicated on drawings for vertical expansion joint locations.
system. Expanding foam to be cellular foam impregnated with a water-based, non-
drying, polymer-modified 100% acrylic dispersion.
Material shall be capable of movements of +25%, -25% (50% total) of nominal
BACKERSEAL to be installed recessed from the substrate faces and to receive a field-
applied coating of low-modulus liquid sealant (by others) not to exceed ¼ inch, (6mm)
backer rod and liquid sealant (by others) in front of material.
requirements at each joint location that meet the project specification or as defined by
the structural engineer of record.
Manufacturer’s Checklist must be filled out by expansion joint subcontractor and
returned to manufacturer at time of ordering material.
packaged in reels or shrink-wrapped lengths (sticks) with a mounting adhesive on one
PART 3 – EXECUTION
openings constructed to the exact dimensions and elevations shown on shown on
the contract drawings. Deviations from these dimensions will not be allowed
without the written consent of the engineer of record.
The contractor shall clean the joint opening of all contaminants immediately prior
surfaces using accepted industry practices for repair of the substrates in question.
Remove protruding roughness to ensure joint sides are smooth. Ensure that there
is sufficient depth to receive the full depth of the size of the BACKERSEAL being
installed. Refer to Manufacturers Installation Guide for detailed step-by-step
No drilling, or screwing, or fasteners of any type are permitted to anchor the
Clean and Protect
the expansion joint system will be repaired at the general contractor’s expense. After
work is complete, clean exposed surfaces with a suitable cleaner that will not harm or
attack the finish.
END OF SECTION