Wood surfaces must be free of knotholes, gouges, and other irregularities. Butt joints in wood should be sealed with a 4-in-wide membrane detail strip, then installed. Masonry substrates should have all mortar joints struck flush. If masonry is rough, a large coat of cement and sand is required to smooth surfaces.
Metal penetrations should be cleaned, free of corrosion, and primed. Most systems require priming to improve adhesion effectiveness and prevent concrete dust from interfering with adhesion (Fig. 2.65).
|FIGURE 2.65 Applying primer to concrete substrate in|
preparation for sheet system.
|FIGURE 2.66 Application of sheet membrane.|
|FIGURE 2.67 Removing release paper backing from|
self-adhering sheet membrane.
|FIGURE 2.68 Seam lap detailing for sheet membranes.|
|FIGURE 2.69 Typical sheet membrane application detailing.|
|FIGURE 2.70 Applying mastic termination detailing.|
|FIGURE 2.71 Back-rolling membrane at seams to|
Each manufacturer has specific details for use at protrusions, joints, and change in plane (Fig. 2.72). Typically, one or two additional membrane layers are applied in these areas and sealed with seam sealant or adhesive (Fig. 2.73). Small detailing is sealed with liquid mem- branes that are compatible and adhere to the sheet material. Figure 2.74 details a typical col- umn foundation waterproofing application. Figure 2.75 shows the proper treatment of a control or expansion joint using sheet systems.
|FIGURE 2.72 Transition detailing for sheet membranes.|
|FIGURE 2.73 Applying reinforcement strips at transition|
|FIGURE 2.74 A column foundation waterproofing detail.|
|FIGURE 2.75 Expansion joint treatment using sheet system|
Protrusions through the membrane must be carefully detailed as shown in Fig. 2.76.
|FIGURE 2.76 Protrusion detailing for sheet systems.|
|FIGURE 2.77 Expansion joint treatment incorporating waterstop.|
|FIGURE 2.78 Termination of sheet membrane using termination bar.|
|FIGURE 2.79 Termination of sheet membrane using|