Page 259 - Construction Waterproofing Handbook

5.18 CHAPTER FIVE
binary systems. The field-applied sec-
ondary systems (previous section) can be
described as a binary system, but for iden-
tification purposes, binary systems usually
refer to premanufactured systems that
consist of two systems capable of provid-
ing primary barrier seals if installed
individually.
FIGURE 5.22 Primary seal applied directly to sec- Figure 5.24 presents a typical binary sys-
ondary seal. (Courtesy of Emseal)
tem, composed of precompressed foam with
silicone sealant facing. The system eliminates
the need for a backing material, but not the requirement for a field-applied edge seal to com-
plete the installation.
Again, these products are designed as primary barriers and will not prevent infil-
tration that occurs through porous substrates that permit water to bypass the primary
barrier. They should be used on impervious envelope components or in conjunction
with a waterproofing or sealer applied to the pervious envelope facade substrate.
Binary systems are excellent choices when the joint width exceeds the standard one-
inch maximum or whenever a joint is expected to experience maximum movement
during life-cycling.

Aluminum window
Shim as required

EMSEAL
Backer rod
and sealant

Precast window sill
FIGURE 5.23 Secondary seal beneath the backer material. (Courtesy of Emseal)