Expansion Joints and Pre-Compressed Sealants


BEJS SYSTEM -- Bridge Expansion Joint System


Tech Data

Install Data

Product Summary

Guide Spec


Sample Request


 Resize, Rebuild, Reseal

Sizing Bridge Expansion Joints


Sistema BEJS en español

 BEJS Sizing Chart

BEJS Order Form

BEJS-ON-A-REEL Information Sheet

• Watertight, tensionless silicone bellows

• Traffic durable

• Precompressed

• Primary seal for bridge preservation

• Retrofit and new

• Easy installation, non-invasive anchoring

• Staged installation preserves traffic flow

• Joint-face adhered

100% free of wax or asphalt compounds (Why does this matter?)

Standard Sizes: 1/2" (12mm) to 4" (100mm)

Movement Capability:
+50% and -50% (Total 100%) of nominal material size (see "Performance").

Ideal for new construction and retrofit of old or failed bridge expansion joint systems
In concrete-to-concrete substrates,
EMCRETE-repaired substrates,
• Metal reinforced edges where demolition and removal of existing embedded metal angles is not feasible or affordable.

Watch How Quickly and
Efficiently BEJS Installs

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What's Different?

BEJS is not like other foam-based expansion joints.  BEJS is supplied precompressed to less than the joint size.  It is held in compression by its packaging. When released it expands. BEJS, properly sized, is never in tension in the joint. This is the key to its performance.

BEJS is coated at a width that exceeds the maximum expected joint opening. Expansion is faster when hot and slower when cold. The pictures below are of a small piece of BEJS cut by the contractor to gauge expansion rate before installation on a hot (95-deg-F) day.  Expansion is slower in cold weather.

Small piece of precompressed BEJS from EMSEAL cut from stick to guage expansion rate.
Liquid sealants and asphaltic plugs fail in extension due to tensile stresses at the bondline or within the system.  Closed-cell foams (EVA-types), rubber compression seals, and inflated seals all fail from tensile stresses at their bond lines after compression set takes place.

Product Description
The BEJS SYSTEM builds on a track record of over 30 years of sealing bridge joints with precompressed, impregnated foam sealants.

The system is comprised of:
1) Precompressed, silicone-and-impregnated-foam hybrid installed into...
2) field-applied epoxy adhesive on the joint faces; with the Pecora 301 silicone bellows locked to the joint faces with...
3) a silicone sealant band (see Figure 1).

The BEJS SYSTEM features an innovation in sealant technology in the form of a patent-pending acrylic adhesive infused into the cellular foam base material. This new chemistry incorporates a hydrophobic microsphere component never before available in a sealant formulation.

The material features sealing performance significantly greater than any acrylic impregnated predecessor. In addition, it is odorless, clean handling, UV stable, non-staining, and features low temperature flexibility not previously available in asphalt, wax, or isobutylene-based predecessors.

The result is extension of the usability of the product to applications where asphalt and wax-based predecessors did not work well under conditions of thermal shock (rapid opening and closing of joints during large temperature swings). These applications include joint-face adhered installations on top decks as well as intermediate decks.

Suitability is further extended to horizontal-plane joint applications in colder geographical regions to which asphalt and wax-based predecessors have not previously been recommended.

RESIZE, REBUILD, RESEAL -- The EMSEAL Approach to Bridge Expansion Joint Retrofit.

BEJS SYSTEM in Typical Concrete Substrates (new or retrofit):


Watertight—the tensionless silicone bellows is installed just below the deck surface. This ensures watertightness is achieved at the deck surface.

Unlike liquid-applied sealants, compression seals, and inflated seals, the BEJS SYSTEM does not rely on adhesion in tension.  Instead the material is precompressed in the factory ensuring that the spring energy of compression is always pushing back on the substrate.

Non-Invasive Anchoring—there are no hard metal-to-concrete connections in the system. This includes embedded pins, anchors, screws, bolts or tracks, trays or rails. The system is locked to the joint faces by means of the 1) backpressure of the foam; 2) the epoxy adhesive, and 3) the injected silicone sealant band at the joint face to foam and silicone bellows interface.

Continuity of Seal—as in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator. Details for watertight, field-fabricated transitions from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are available with the BEJS SYSTEM.

Aesthetics & Versatility—Standard bellows color is black with grey also readily available (other custom colors are also available), uniform bellows appearance, fuel resistance, and an enhanced ability to handle variations in joint size are among other system features.

Installation is fast, easy, and can be staged to preserve partial traffic flow.

• Capable of movements of +50%, -50% (100% total) of nominal material size.

• Substrates must be parallel, plumb and capable of resisting approx. 2.5 psi backpressure from the foam.

• Standard sizes from 1/2" (12mm) to 4" (100mm). Other sizes available subject to review of application: consult EMSEAL.

• Fuel Resistance: Silicone sealant is not degraded by contact with fuel. Some swelling of the material will normally occur, but it will return to its original shape upon evaporation of the fuel.

• BEJS is produced by coating an impregnated cellular foam with AASHTO-approved, Pecora 301 highway-grade silicone.
• The expanding foam is cellular polyurethane foam impregnated with a water-based acrylic containing a high performance micro-cellular additive.
• The silicone external facing is factory applied to the foam at a width greater than maximum joint extension and is cured before final compression.
• Silicone application and curing takes place in a factory-controlled environment. In contrast to field applied liquid sealant and backer rod installations, no movement takes place during curing that can cause deformation or stresses in the material.
• When compressed, a bellows is created in the coating. As joint movement occurs the bellows simply folds and unfolds free of tension on the bond line, and virtually free of tensile stresses in the silicone material. Sizes under 1-inch (25mm) have a single-curve convex bellows; sizes from 1-inch (25mm) through 4-inches (100mm) have a dual-curve convex bellows. 
• The foam provides a resilient backing to the silicone coating, making the system capable of resisting reasonable transient point loads.
• BEJS SYSTEM is supplied in 6.56 LF (2m) shrink-wrapped lengths (sticks). It is precompressed to less than the joint size for easy insertion. After removal from the shrink-wrap and hard board restraining packaging, it expands gradually.

BEJS SYSTEM in New or Rebuilt Joint Edges with EMCRETE Nosing Material

BEJS SYSTEM in Existing metal angle substrates (retrofit):


(Expanded Universal-90's information)

Factory-Fabricated Terminations and Transitions—in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator.

BEJS is manufactured in straight-run sticks which can be joined in the field to EMSEAL’s patent-pending "Universal-90" Transitions and Terminations.

Universal-90 Upturn Termination

Universal-90 Flipped-Over as Downturn Termination

Universal-90 Upturn Transition

Universal-90 Flipped-Over as Downturn Transition

These factory-fabricated single-piece 90-degree units have a 12-inch long leg and a 6-inch vertical piece on each end of the elbow.   The Universal-90's are symmetrically coated on both sides.  This allows them to be installed as an upturn or as a downturn.  Either leg can be trimmed in the field to connect to straight run material or to another Universal-90 when going, for example, up and over a curb and/or parapet.

Universal-90 terminations end, on the 6-inch leg, in a 45o sealed and mitered end.  This allows termination as a stand alone upturn in a parapet wall or provides a surface against to which a wall joint system can be married.  Flipped over, the Universal-90 termination unit can be alternatively installed as downturn termination where a joint runs off the bridge deck.  In this use, the sealed, mitered end provides a drip edge for drainage of water off the joint.

In addition to guaranteeing a continuous waterproof coating, EMSEAL’s "Universal-90's" allow for much faster and secure installation by eliminating field cutting or notching and bending at angles.

(Need help with Bridge and Road Expansion Joints and Joints Sealants? Fax Us This Checklist)



EMSEAL JOINT SYSTEMS LTD. 25 Bridle Lane, Westborough, MA 01581
EMSEAL LLC. 120 Carrier Drive, Toronto, ON M9W 5R1

1-800-526-8365 -- 508-836-0280 --  techinfo@emseal.com -- Fax: 508-836-0281

Last Modified: April 22, 2014

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