Liquid Flashing WW

Two‐component polymethyl methacrylate (PMMA) liquid

Liquid Flashing WW has a shelf life of up to 12 months in the original unopened pail when properly stored, sealed and unmixed.

Store in a tightly closed container in a cool, dry, ventilated area away from heat and oxidizing agent. Do not store in direct sunlight or in temperatures below 32°F (0°C) or above 77°F (25°C). Keep away from open fire, flame or any ignition source.

4.2 g/L (Liquid Flashing WW + Liquid Flashing Catalyst Combined)

43 ft² (4 m²) per 2.5 gallon (9.8 L) pail at 115 mil (2.9 mm) thickness

1. All surfaces should be clean, dry, free of dirt, dust, debris, loose particles, loose paint, rust and other contaminants.
2. Clean new roofing membrane with cleaner which will not remove the lacquer coating from the membrane. If the membrane is old or extremely soiled Sika's Seam Cleaner should be used to restore the membrane to a `like new’ condition before applying Liquid Flashing.
3. Clean and prepare metal surfaces to near white metal in accordance with SSPC-SP3 (power tool clean). If power tools are not available, use abrasive paper with a grain size of 20 to 40 to remove all loose particles including paint flakes and rust.
4. Grind concrete and masonry surfaces with diamond cup wheel to remove laitance and contaminants.
5. Lightly sand rigid PVC and plastic surfaces. Extend surface preparation a minimum of 1/8" (3 mm) beyond the termination of the flashing.
6. Wipe metal surfaces with Sika’s Seam Cleaner and allow to dry.
7. For repairs or touch-up, wipe previously installed Liquid Flashing with Sika’s Seam Cleaner to clean and reactivate the Liquid Flashing and allow to dry.
8. Prime wood and concrete surfaces with Liquid Flashing Primer. Allow Liquid Flashing Primer to dry to the touch before applying Liquid Flashing.
9. If a gap of more than 1/4" (6.3 mm) exists between edge of horizontal membrane surface and vertical transition surface, the gap must be filled with Sikaflex®‐1a.

1. Pre-cut Liquid Flashing Fleece to fit around the penetration. Vertical flashing pieces must extend 2" (51 mm) from the base onto the horizontal and horizontal flashing pieces must extend 4" (10.2 cm) out from the base of any penetration. Flashing height should be a minimum of 8" (20.3 cm). Horizontal flashing fleece pieces must extend a minimum of 4" (10.2 cm) beyond the leading edge of the penetration, or a minimum of 2" (51 mm) beyond the edge of the fastening plate. Add 2" (51 mm) for the overlap with adjoining pieces.
2. Once the edges of the fleece are determined, mark a line on the membrane ½" (13 mm) beyond the edge of the fleece and apply painter’s tape. This will accommodate the ½" (13 mm) of non-reinforced Liquid Flashing needed to terminate to the membrane.
3. With the tape in place, clean the membrane within the area using Sika's Seam Cleaner, acetone, or methyl ethyl ketone (MEK) including the plates and the penetration.
4. Thoroughly stir the entire container of Liquid Flashing with a slow-speed (200 to 400 rpm) mechanical mixer (electric drill with a mixing blade) for two minutes.
5. Pour 1 liter of Liquid Flashing into a clean plastic container. Add Liquid Flashing Catalyst to Liquid Flashing WW at rates depending on ambient temperature (see Mixing Rates table below). Mix using a slow-speed mechanical mixer with a separate mixing paddle for two minutes. Once mixed, the pot life is approximately 10 - 15 minutes depending on the ambient temperature.
6. Using a small ½" (13 mm) nap roller with rounded edges or 2" (51 mm) disposable paint brush apply 55 mils (1.4 mm) of catalyzed Liquid Flashing onto the penetration up to the finished flashing height and 2" (51 mm) onto the roof membrane.
7. Embed the pre-cut vertical Liquid Flashing Fleece into the wet Liquid Flashing. Use the roller or brush to eliminate wrinkles and air bubbles while completely saturating the Liquid Flashing Fleece. Apply additional catalyzed Liquid Flashing at the 2" (51 mm) overlap between the vertical Liquid Flashing Fleece layers.
8. Apply 55 mils (1.4 mm) of catalyzed Liquid Flashing onto the roof membrane extending slightly onto the painter's tape. Also coat the 2" (51 mm) fingers from the vertical Liquid Flashing Fleece.
9. Embed the pre-cut horizontal Liquid Flashing Fleece into the wet Liquid Flashing. Use the roller or brush to eliminate wrinkles and air bubbles while completely saturating the Liquid Flashing Fleece. Apply additional catalyzed Liquid Flashing at the 2" (51 mm) overlap between the horizontal Liquid Flashing Fleece layers.
10. Apply 25 mils (0.6 mm) of catalyzed Liquid Flashing over the entire exposed vertical and horizontal flashing fleece terminating at the finished flashing height on the vertical and onto the painter's tape on the roof. Make sure the fleece is fully saturated without any dry spots.
11. Remove the painter's tape immediately after applying the final 25 mils (0.6 mm) of catalyzed Liquid Flashing.

Note:
Complex and/or irregular shapes including nuts, bolts, etc. may require an additional 25 mils (0.6 mm) of catalyzed Liquid Flashing to ensure full coverage. Wait one hour before applications. For repairs or touch-up, wipe cured Liquid Flashing with Sika’s Seam Cleaner to clean and allow to dry.

MIXING RATES

COVERAGE
43 ft² (4 m²) per 2.6 gal (10 L) pail at 115 mil (2.9 mm) total thickness