Emseal SJS-FP: Seismic Plaza Deck Expansion Joint

  • Split-slab decks with concrete, paver or asphalt hardscaped wear courses
  • Parking decks
  • Plaza decks
  • Podium decks
  • Airport roadways
  • Mall bridge connectors
  • Stadium concourses, etc.
  • For new construction, as well as repair and retrofit of old or failed expansion joint systems.
  • For restoring watertightness to chronic leaking over occupied spaces.
  • Uniquely suited to joint openings designed for seismic separation of structural building elements.

Technical Data Sheet

Safety Data Sheet

Emseal Checklist

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Emseal SJS-FP: Seismic Plaza Deck Expansion Joint

Emseal SJS-FP is a seismic plaza deck expansion joint system the Emseal SJS-FP System is designed to provide a watertight, trafficable joint system in wide expansion joints in hardscaped decks of split-slab design. Emseal SJS-FP expands the use of the SJS System to waterproofed hardscaped split-slab deck designs through the use of structural-slab mounted retainer legs with integral waterproofing side sheets that integrate with the deck waterproofing membrane. Questions?Contact Us.


The retainer legs are available in leg heights that can be matched to the topping slab or wear course thickness. The waterproofing side sheets lock into the top of the retainer legs and are embedded in and encapsulated by the deck waterproofing membrane. The SJS System foam/spline assembly installs between the faces of the retainer legs. The foam/spline assembly is constructed from two precompressed foam sealants pre-assembled in parallel adjacent to a heavy-duty extruded aluminum spline. The spline acts as a receptor for attaching the surface-mounted traffic plates that bear vehicle and other loads.

The result is a system that is watertight and covered with a cover plate that is securly anchored into the wear course.

  • Watertight & traffic durable
  • ADA Compliant
  • Watertight and static tie-in to deck waterproofing
  • Sound dampened
  • Non-invasive cover plate anchors

Watertight – Emseal FP (For Plaza) systems are purpose-designed to provide watertight joint sealing and watertight integration with the buried deck waterproofing membrane. The DSM System material is installed between the faces of the FP retainer legs with the silicone bellows facing the weather to ensure watertightness in the joint gap. The tensionless silicone bellows are installed essentially flush to the deck surface just below the stainless steel capping strips thereby ensuring watertightness at the wear-course surface. This eliminates the need for secondary moisture barriers and gutter systems.

Sound Attenuation – The flanking impregnated foam and silicone hybrid dampens sound and shock effectively. When installed over EMSEAL-supplied elastomeric nosing material, the result is arguably the quietest watertight coverplate system available.

Self-Locating Coverplate Screws – The center spline is a continuous receptor for the coverplate screws that are self-tapped into the anchor channel. This dramatically reduces the installation-related problems of locating self-centering, sliding ball devices and pantographs. The probability of screws being left out is eliminated ensuring proper anchoring.

Self-Locking, Vibration-Dampened Screws – Vibration in systems that rely on metal-to-metal connections and contact points is the main cause of screw loosening. SJS by EMSEAL minimizes vibration through the dampening action of the massive and continuous springs of impregnated foam along the entire length of the joint. In addition, 30 pounds of force is required to loosen the screws offering excellent screw tightness without the need for thread-lock compounds.

Field-Adjustable Plate Support – Concrete in new and retrofit applications is inevitably uneven across and along the joint. The SJS can be installed over a leveling-bed of EMSEAL-supplied Emcrete elastomeric nosing material. This provides the ability to fine-tune the support of coverplate sections reducing rocking and noise caused by unleveled plates. Systems that attach or utilize intrusive extruded rails to receive sliding ball and socket devices cannot be adjusted to eliminate unevenness across and down the length of the joint.

Continuity of Seal – All EMSEAL expansion joint systems feature continuity of seal through changes in plane and direction –– an essential performance differentiator. Fabricated transitions from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are available with the SJS.

Finite Element Analysis (FEA) Compiled Safety Factors – Prior to field trials, the SJS by EMSEAL was modeled using FEA to determine the suitability of design to worst case possible parking deck loads. Under the scenario of a 4,000 lb vehicle skidding across the joint system to full stop once past the coverplate, FEA modeling predicted lateral displacement of the coverplate of less than 3/4-inches (19mm) and safety factors in key components