Page 257 - Construction Waterproofing Handbook

5.16 CHAPTER FIVE

FIGURE 5.19 Interior sealing of double joint.

1
1 /2"

Natural stone

Sealant applied
directly on Greyflex

Steel
strut
EMSEAL system
(Greyflex)

FIGURE 5.20 Typical secondary joint sealant design. (Courtesy of Emseal)

The secondary seal is often a precompressed foam sealant, as presented later in this chap-
ter. The secondary sealant should be installed as required by the manufacturer as a primary
seal, including proper cure time before the backer rod and sealant is applied. This prevents the
secondary seal from not functioning as designed and preventing loss of the dual protection.
Secondary seals are not intended to prevent the problems associated with pervious sub-
strates and water bypassing the primary sealant, as discussed in the previous section.
However, the precompressed foam can be used as a double seal in the rear portion of the