Page 99 - Construction Waterproofing Handbook

2.62 CHAPTER TWO
substrate. Installations are relatively simple, but clay is extremely sensitive to weather
during installation. If rain occurs or groundwater levels rise and material is wetted
before backfilling, hydration will occur prematurely and waterproofing capability will
be lost, since hydration occurred in an unconfined space.
Immediate protection of applications is required, including uses of polyethylene cov-
ering to keep materials from water sources before backfill. If installed in below-grade
conditions where constant wetting and drying occurs, clay will eventually deteriorate
and lose its waterproofing capabilities. These systems should not be installed where
free-flowing groundwater occurs, as clay will be washed away from the substrate.

SOLDIER PILE
WOOD LAGGING
CONCRETE WALL
RETAINED EARTH
MIRADRAIN 6000 (FABRIC
TOWARD LAGGING)
MIRACLAY
TIE BACK ROD
NONAQUEOUS BENTONITE
COMPOUND OVER
METAL TIES

FIGURE 2.80 Clay system applied directly to foundation lagging. (Courtesy of TC MiraDRI)