Page 80 - Construction Waterproofing Handbook

BELOW-GRADE WATERPROOFING 2.43

FIGURE 2.53 Roller application of fluid-applied membrane.
(Courtesy of American Hydrotech)

The detailing provided in Fig. 2.58 shows a fluid membrane application that runs con-
tinuously on the horizontal surface, including beneath the wall structure. Many engineers
will not permit such an application due to the membrane acting as a bond break between
the wall and floor components that might present structural engineering problems.
In Fig. 2.59, the manufacturer has detailed the use of a liquid membrane over founda-
tion lagging using a fluid-applied membrane before the concrete is placed. In this detail,
the membrane is applied to a sheet-good fabric that acts as the substrate. This is applied
over a premanufactured drainage mat to facilitate water drainage and hydrostatic pressure.
This would be a difficult application, and not as idiot-proof as using a clay system in a sim-
ilar installation as outlined later in this chapter.
All penetrations occurring through a membrane application must be carefully detailed to
prevent facilitating water infiltration at this “90%/1% principle” envelope area. Figure 2.60
shows a recommend installation at a pipe penetration. Note that the concrete has been