Page 292 - Construction Waterproofing Handbook

5.50 CHAPTER FIVE
TABLE 5.12 Generic Sealant Materials and Their Common Uses

Poly- Poly-
Substrate Acrylic Butyl Latex sulfide urethane Silicone
Metal frame at X X X
interior
Metal frame at X X X
exterior
Precast joints X X X
Glazing and bed X X
joints
Interior work X X X
Stucco crack repair X X
Horizontal joints X X
Submerged joints X
Wood joints X X
Metal curtain walls X X X X
Stone and masonry X X X
joints
Bath fixtures X X X
High movement X X
joints
Parking deck joints X
Marble X X
Granite X X
Limestone X X
Kynar® finish X

A typical glazing detail is shown in Fig. 5.54. Note that the silicone structural glazing
material is used to attach the glass to the metal mullion of the curtain wall components.
The detail also includes the use of a nonstructural silicone material to seal the butt ends of
the glass together and provide for a weathertight joint that is capable of expanding or con-
tracting under thermal movement. A low-modulus material is typically used on the non-
structural portion, while higher-modulus and higher-tensile-strength materials are used for
the structural glazing attachment.
Typical guidelines for structural glazing joint design (refer to Fig. 5.54) include:
● The “bite” dimension length should be a minimum of 4 in.
1
1
● The “glueline” thickness should be a minimum of 4 in.
● The “bite” dimension must be equal to or greater than the “glueline” dimension.

It is recommend that the structural bite dimension be calculated by using the following
equation (Courtesy of Dow Coming):