Watertight – The tensionless silicone bellows are installed flush
to the mounting height of the
system and just below the cover plate ensuring watertightness at the
This eliminates the need for ineffective moisture
barriers and secondary
SJS SYSTEM is also available
specifically for watertight integration with split-slab buried
waterproofing systems--see SJS-FP.
Sound Dampened – The flanking impregnated foam and silicone
hybrid dampens sound and
shock effectively. When installed over EMSEAL-supplied elastomeric
nosing material (EMCRETE), the result is arguably the quietest watertight
cover plate system available.
(Click to see and hear the SJS difference.)
Installs Rapidly – Using non-invasive anchoring the
eliminates drilling associated with hard metal-to-concrete connections as well as intrusive pins,
anchors, screws, bolts or tracks, trays or rails. The system is locked
to the joint faces by the backpressure of the foam and an epoxy
adhesive, and by the weight of the assembly.
(Watch the video of installation
in a parking deck
or a stadium).
Self-Locating Cover Plate Screws – The center spline is a
continuous receptor for the cover plate 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.
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.
Plate Support – Concrete in new and retrofit applications is
inevitably uneven across and along the joint. The SJS SYSTEM is installed over
a leveling-bed of EMSEAL-supplied elastomeric nosing material providing
the ability to fine-tune the support of cover plate sections. This
eliminates plate 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
changes in plane and direction –– an essential performance
differentiator. Interlocking or continuous fabricated transitions
for curbs, sidewalks, treads and risers, and parapets for example, are
available with the SJS SYSTEM.
Analysis (FEA) Compiled Safety Factors – Prior to field trials, the
SJS SYSTEM 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 cover plate, FEA modeling
predicted lateral displacement of the cover plate of less than 3/4-inches
(19mm) and safety factors in key components as follows:
Traffic Plate - 5; Screws - 11; Spline Pins - 10; Center Spline - 7