LIMITATIONS
- Apply Sikalastic® HLM 5000 GC when substrates are dry and air temperatures are +40 °F to +90 °F (+4 °C to +32 °C); for application at temperatures below +40 °F (+4 °C), consult Technical Services.
- Temperatures influence viscosity and handling characteristics of Sikalastic® HLM 5000 GC : heat increases and cold decreases the flow. Keep Sikalastic® HLM 5000 GC cool in hot weather and warm in cold weather. Avoid application when inclement weather is present or imminent.
SURFACE PREPARATION
- All concrete deck surfaces should be lightly steel troweled to a flat uniform surface. A light broom finish is acceptable. Membrane curing compounds must be mechanically removed.
- For extremely porous block: Prime substrate with Sikadur-22 Lo-Mod FS, Sikalastic FTP Lo-VOC Primer or Sikalastic GDC Primer.
- Remove dust, dirt and other contaminants just before application. Surfaces must be dry at the time of application.
- Air-void pockmarks or honeycombs must be opened up to allow Sikalastic® HLM 5000 GC to fill the cavities completely. Air entrapment within voids may cause blisters. Extreme cases may require additional repair.
PRESTRIPING
- Before applying the final membrane, all joints, cracks and openings around protrusions must be sealed by caulking or prestriping (a preliminary coating of Sikalastic® HLM 5000 GC applied with a trowel or stiff- bristled brush) as outlined in section "Static Joint and Cracks". Allow to dry overnight before applying final membrane.
- When the final membrane is applied, the overall thickness over joints and cracks, at coves and around penetrations should be approximately 100 wet mils (2.5 mm) on the standard system.
STATIC JOINTS AND CRACKS
Joints and cracks less than 1⁄16" (1.6 mm) should be filled by prestriping. Apply material so it both fills and overlaps the joint or crack to a width of 4" (102 mm) on each side.
CONSTRUCTION OR EXPANSION JOINTS
All joints over 1⁄8" (3 mm) must be sealed with Sikaflex®-1A or Sikaflex®-11 FC. Any working joint less than 1⁄8" (3 mm) should be routed to a minimum of 1/4" (6 mm) and filled with a sealant. Prevent the waterproofing membrane from adhering to the joint sealant, which could cause sealant or membrane failure, by applying a coat of wax or bond breaker tape over the cured sealant and then prestriping.
UNCOATED METAL SURFACES
Remove dust, debris, and any other contaminants from vent, drain pipe and post penetrations, reglets and other metal surfaces. Clean surfaces to near white per SSPC- NACE2 and prime immediately with Sikadur-22 Lo-Mod FS or Sikalastic EP Primer. Provide appropriate cant with Sikaflex®-1A or Sikaflex®-11 FC sealants to eliminate 90° angles.
VENT, DRAIN PIPE, AND POST PENETRATIONS
Clean metal surfaces to bright metal and prime with metal primer Sikadur-22 Lo-Mod FS or Sikalastic EP Primer. Remove dust, debris and any other contaminants from voids. Seal with the appropriate sealant. For PVC substrates use Sikaflex® Primer-449.
APPLICATION
A test application is always recommended before proceeding with entire application.
NOTE: Finish coat must be applied in a pinhole-free, continuous membrane for waterproofing integrity. STANDARD SYSTEM
- For horizontal applications, empty contents of pail and spread immediately to ensure workability. Best results are obtained by marking off 125 ft2 (11.61 m2) areas and evenly spreading the contents of a 5 gallon (18.93 L) unit with a rubber-edged notched squeegee. Repeat the above procedure until the entire surface is covered.
- For vertical applications, apply by brush or roller at the rate of 25 ft2/gallon (0.6 m2/L). Best results are obtained by marking off 125 ft2 (11.6 m2/L) and evenly applying the contents of a 5 gallon (18.93 L) pail.
- Verify the applied thickness with a wet mil gauge as the work progresses.
- The integrity of the cured membrane on a horizontal surface may be verified by damming the entire area and flooding with water to a minimum depth of 2" (51 mm) and allowing the water to stand for 24 - 48 hours. Visually inspect the bottom surface to check for any water penetration. If repairs are necessary, the area should be drained and allowed to dry before reapplying Sikalastic® HLM 5000 GC. After reapplication, the area should be tested again for membrane integrity.
HIGH-BUILD SYSTEM
- Concrete application: Apply 60 wet mils of Sikalastic® HLM 5000 GC. Allow the first coat to cure overnight and follow with a second 60 wet-mil application of Sikalastic® HLM 5000 GC.
- Plywood/OSB board application: All plywood construction must comply with APA (American Plywood Association) standards. All plywood/OSB board joint must be sealed Sikaflex®-1A or Sikaflex®-11 FC. A detail coat of the membrane must be applied before the final membrane is installed.
CURING
Appreciable properties develop within 24–48 hours at 75 °F (24 °C) and 50% relative humidity. Protect Sikalastic® HLM 5000 GC from traffic during curing.
