Page 314 - Construction Waterproofing Handbook
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6.18 CHAPTER SIX
TABLE 6.7 Preformed Rubber Expansion Joint Properties
Advantages Disadvantages
Factory manufactured Cost
High-impact strength Difficult transitions
Chemical resistant Limited remedial applications
Premanufactured enclosures are available, to terminate preformed joints into other
building envelope systems. Factory-manufactured accessories are available for changes in
plane, direction, and intersections with other joints (Figs. 6.18 and 6.19). Premolded joints
are used in remedial applications but require concrete substrates to be cut, to provide a
ledge to place flanges as shown in Fig. 6.20. (See Table 6.7.)
Combination rubber and metal
systems
Combination rubber and metal systems are manufactured with a basic rubber extru-
sion seal and metal flanges for casting directly into concrete placements (Fig. 6.21).
These systems are designed for new construction installations and are placed by the
concrete finishers. They are not used in remedial applications unless major rework-
ing of a deck is involved. Joints are manufactured in large sizes, with no joints being
less than 1 in wide.
The metal flanges on each side have reinforcement bars or studs for bonding with the
concrete. Some combination joints include intermediate metal strands between the rubber,
for additional reinforcement and wear. Others include metal cover plates for additional
protection against traffic wear.
FIGURE 6.16 Preformed rubber expansion joint. (Courtesy Emseal Joint Systems)
