Page 407 - Construction Waterproofing Handbook

THE BUILDING ENVELOPE: PUTTING IT ALL TOGETHER 10.9
TABLE 10.1 Commonly Used Flashing Systems and Their Functions

Location Function
Base flashing Prevents capillary action of water from wicking upward
in a masonry wall, Fig. 10.7
Sill flashing Installed beneath window or curtain wall sills, Fig. 10.8
Head flashing Installed above window head detail, just below adjacent
facing material that the window abuts, Fig. 10.8
Floor flashing Used in conjunction with shelf angles supporting brick or
other facade materials
Parapet flashing Installed at the parapet base, usually at ceiling level; may
be used on roof side of parapets as part of roof or coun-
terflashing, Fig. 10.9
Counterflashings Surface mounted or placed directly into walls with a por-
tion exposed to flash various building elements into the
envelope, including roof flashings, waterproofing
materials, building protrusions, and mechanical equipment,
Fig. 10.10
Exposed flashings Used in a variety of methods and locations; can be an inte-
gral part of an envelope system, such as skylight construc-
tion, or applied to provide materials protection between
two dissimilar, including cap flashings, coping flashings,
gravel stops, edge flashings, and terminations, Fig. 10.11
Remedial flashings Typically surface mounted and applied directly to
exposed substrate faces; can include a surface-mounted
reglet for attachment; do not provide for redirecting
entering water; only by dismantling a wall or portion
thereof can remedial through-wall flashings be installed,
Fig. 10.12

ends dammed and detailed to allow for this movement. Typical flashing installations in
common building materials are shown in Fig. 10.13.

Dampproofing
Dampproofing materials are typically used in conjunction with flashing and weep systems
as part of secondary or backup systems for primary envelope waterproofing materials such
as masonry walls. In addition, dampproofing systems are used at below-grade applications
to prevent moisture vapor transmission or capillary action through concrete or masonry
walls. Dampproofing can be applied in either negative or positive installations.
Dampproofing prevents damage to envelope components where surface water can collect
and drain to below-grade areas. It also protects when improper surface water collection
systems are not used in conjunction with below-grade drainage mats.
Dampproofing materials, as defined, are not intended to, nor do they, function as pri-
mary envelope waterproofing systems. They function only as additional protection for the