Page 305 - Construction Waterproofing Handbook

EXPANSION JOINTS 6.9

FIGURE 6.6 Finishing of T-expansion joint. (Courtesy of Coastal Construction Products)

Epoxy nosings are installed level with the edge of the concrete deck and are installed by
troweling to cover minor irregularities within the deck. With preformed joints, sealant is
beveled along edges at approximately 45°, upon which nosing material is placed. This pro-
vides adequate bonding to secure the preformed sealant to a substrate. Nosing material
should not flow or be troweled onto horizontal portions of the sealant surface, as this pre-
vents sealant movement capabilities.
These joints may be applied over existing expansion joints by ramping the polymeric
nosing upward to provide the required sealant depth. However, this exposes a joint to abuse
from vehicular traffic and nosing will eventually wear, exposing sealant to damage.
T-systems are labor intensive, providing opportunities for job-site misapplications as
compared to factory-manufactured systems that require minimal field labor. (See Table 6.2.)

TABLE 6.2 T-Expansion Joint Properties

Advantages Disadvantages
Reinforced for better wearing Labor intensive
Seamless application Sealant portion exposed to wear
Ease of terminations Not for excessive wear applications