Template:Part 10 (Waterproofing Roofs - SBS)

Picture-frame Approach

1. Before installing the base field membrane, “picture-frame” the field area adjacent to sensitive locations with self-adhering or adhesive-applied membranes; apply membranes to a suitable substrate on the roof field, to a width of at least 1.5 m (58 ½”), beginning with a half-width sheet along the roof edge. See Figure 10.3.2-1.
2. Perimeters must be flashed with self-adhering or adhesive-applied membrane base flashing. Base membrane flashing plies must extend
   1. no less than 100 mm (4”) onto the roof field.
   2. no less than 200 mm (8”) on walls or tall parapets, or to fully cover parapets up to 600 mm (24”) in height.
3. Field base membrane must be installed and tied into the “picture frame” following the General Application standards for side and end laps (refer to 9.3.1 General).
4. Standard application of cap field membranes must be carried no closer than 1 m (39”) of the wall or parapet. See Figure 10.3.2-2.
5. Self-adhering or adhesive-applied cap membranes must be applied to complete the field. Side and end laps must be heat-sealed with a hot-air welder.
6. Self-adhered or adhesive-applied cap membrane flashing must be applied to parapets or walls, in keeping with General Application standards for membrane flashing. Side and end laps must be heat-sealed with a hot-air welder.
7. All other applicable Standards in this Manual apply.

Figure 10.3.2-1 (Click to expand)

Figure 6.3.2-2 (Click to expand)