DSM System

A watertight expansion joint, the DSM System is for horizontal-plane deck applications. Traffic durable, joint-face adhered and pre-compressed, DSM System is a primary seal for deck expansion joints. DSM’s toughness and resilience come from its microsphere-modified-acrylic impregnation and tensionless highway-grade silicone bellows coating.

The system is comprised of 1) pre-compressed, silicone-and-impregnated-foam hybrid; 2) field-applied epoxy adhesive on the joint faces; 3) a silicone sealant band that seals substrate voids and irregularities.

How it works

An unmatched performance record has established DSM System as a standard for parking deck and stadium expansion joint sealing. Unlike extruded rubber seals, ‘caulk-and-backer rod’ and other predecessor technologies, DSM does not suffer from compression-set nor does it rely on adhesion in tension for its performance. Highly configurable, the DSM System uniquely handles changes in plane and direction essential to ensuring continuity of seal.


Up to 100% Total (+50% and -50% of nominal supplied size)

Features and Benefits

  • Watertight—the system is installed just below the deck surface. This ensures water tightness is achieved at the deck surface not in gutters from which water must be managed.
  • 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 DSM SYSTEM.
  • Aesthetics & Versatility—Standard colour is grey (other colours available), uniform bellows appearance, double sealing, fuel resistance, and an enhanced ability to handle variations in joint size are among other system features.
Image of DSM System

Alternative to caulk and backer rod in smaller control joints and building component joints in:

  • parking decks/car parks
  • stadiums
  • sidewalks
  • decks
  • mall bridge connectors
  • positive-side, below-grade foundation/tunnel wall joints.
  • stair towers
  • arenas

Sizes 12 – 100mm

Contact Us Today
+27 (011) 425 3061 7 Hills Street, Rynfield
Benoni, 1501
South Africa

Company Reg: 1992/009387/23