Page 24 - Construction Waterproofing Handbook
P. 24
1.6 CHAPTER ONE
FIGURE 1.4 Flashing used to prevent water under pressure from entering the
envelope.
FIGURE 1.5 Preventing capillary water infiltration into envelopes.
between the envelope components. This is why certain envelope substrates used below
grade have to be better protected against water infiltration than those above grade. For
example, concrete above grade is often only protected with a water repellent, whereas
below grade the same concrete must be protected with a waterproofing material to prohibit
leakage into the structure.
Designing to Prevent Leakage
Once a complete understanding of the potential sources of water and forces that can move
this water into an envelope is gained for a particular structure, the design must incorporate
