Page 386 - Construction Waterproofing Handbook

8.46 CHAPTER EIGHT
designed to repair joints without necessitating rework of the envelope substrate. These
repair procedures include the installation of a high-performing sealant directly over the
failed joint without requiring the removal of the existing material. This repair method is
detailed in Fig. 8.50.
If the substrate joint width originally was undersized, a remedial overband joint design
can be installed to permit for sufficient space at the joint without having to enlarge the sub-
strate joint width or remove the existing failed sealant. Figure 8.51 details such a remedial
application method, and Fig. 8.52 shows the application method.

EXTERIOR INSULATED FINISH SYSTEMS RESTORATION

EIFS or synthetic stucco systems, as presented in Chap. 3, have a history of problems with
terminations and transitions leakage that fits naturally the description of the 90%/1% and
99% principles. In particular when the EIFS system has been installed as a barrier system
in lieu of a water-managed, drainage, or divertor system, extensive damage can occur to
the structural components of the building envelope. Figure 8.53 shows the damage found
under a residential EIFS system that was posted on a Web site relating to the problems of
EIFS in North Carolina.

FIGURE 8.50 Remedial sealant repair leaving existing sealant in-
place. (Courtesy of Dow Corning)

FIGURE 8.51 Remedial treatment for repairing undersized joints with excess movement. (Courtesy of
Dow Corning)