Page 86 - Construction Waterproofing Handbook

BELOW-GRADE WATERPROOFING 2.49

FIGURE 2.62 Reglet termination detailing for membrane waterproofing. (Courtesy of Tamko Waterproofing)

waterproofing. In small, confined areas such as planter work, vertical installation and tran-
sitions to horizontal areas become difficult and extra care must be taken.

Thermoplastics
Thermoplastic sheet-good systems are available in three compositions: PVC, chlorinated
polyurethane (CPE), and chlorosulfonated polyethylene (CSPE), which is referred to as
hypalon. Materials are manufactured in rolls of varying widths, but difficulty with vertical
applications makes smaller widths more manageable.
On horizontal applications, wider roll widths require fewer seams; therefore, it is
advantageous to use the widest workable widths. All three systems adhere by solvent-
based adhesives or heat welding at seams.
PVC membranes are available in thicknesses of 30–60 mil. CPE systems vary by as
much as 20–120 mil, and hypalon materials (CSPE) are 30–35 mil. All derivatives have
excellent hydrostatic and chemical resistance to below-grade application conditions. PVC
membranes are generically brittle materials requiring plasticizers for better elastomeric
properties, but elongation of all systems is acceptable for below-grade conditions.