Liquid Applied Waterproofing Membrane - Sikalastic®-624 WP

Single component alkali resistant saturating resin for Sikalastic® RoofPro waterproofing systems

Sikalastic®-624 WP is a cold applied, highly elastic, aliphatic, single component, alkali resistant, moisture-triggered polyurethane resin designed for easy application as part of Sikalastic® RoofPro waterproofing systems.

• Proven technology with over 30 year track record
• Single component - no mixing and ready to use
• Fully reinforced with highly conformable Sika Reemat or Sika Fleece
• Moisture-triggered chemistry that is rapidly weatherproof after application
• Highly elastic and crack bridging
• Seamless and fully adhered
• Vapor permeable
• UV resistant and non-yellowing
• Abrasion and chemical resistant
• Alkali resistant formulation

Usage

• Embedment and top resin for Sikalastic® RoofPro systems reinforced with Sika Reemat
• Saturating resin for Sikalastic® RoofPro systems reinforced with Sika Fleece
• Typically applied in Sikalastic® RoofPro Direct, Plaza, and Vegetated systems for both new construction and refurbishment
• Ideal for applications involving cementitious overlays and tile mortar

Advantages

• Proven technology with over 30 year track record
• Single component - no mixing and ready to use
• Fully reinforced with highly conformable Sika Reemat or Sika Fleece
• Moisture-triggered chemistry that is rapidly weatherproof after application
• Highly elastic and crack bridging
• Seamless and fully adhered
• Vapor permeable
• UV resistant and non-yellowing
• Abrasion and chemical resistant
• Alkali resistant formulation

Packaging

5 gal. (19 L) pail

Color

White (RAL 9016), Pearl Gray

Product Details

Sustainability / Certifications / Approvals

• Miami Dade County approved: NOA No.: 15-0113.01
• Meets ASTM C836 Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course.
• Meets ASTM E-108-00 Spread of Flame: Class A at a slope of 1:12

Product Information

Moisture triggered Polyurethane

9 months (Unopened Container)

Store dry between 35 °F and 77 °F (2-25 °C). Condition material to 50-77 °F (10-25 °C) before using for ease of application

10.8 lb./gal. (1294 kg/m³)

Technical Information

Most common roofing contaminants, oils, grease, dilute acids and bases

Application

Application Information

41 °F (5 °C) min. / 95 °F (35 °C) max.

80 % R.H. max.

Beware of condensation.
The substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.

41 °F (5 °C) min. / 140°F (60°C) max.

4 % moisture content Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet)

Sikalastic®-624 WP is designed for fast curing. High temperatures combined with high air humidity will increase the curing process. Thus, material inopened containers should be applied immediately. In opened containers, the material will form a film after 1 hour approx. ( at 75 °F (24 °C) and 50 % R.H.)

Application Steps

No mixing necessary

Sika Reemat - Base Resin
Apply Sikalastic®-624 WP resin to the primed substrate surface by means of 1/2” (12.7 mm) nap phenolic resin core roller or brush at the specified application rate to achieve a uniform and consistent wet mil thickness (reference separate System Data Sheet). Material can also be squeegee or spray applied, in which case it should also be backrolled. Apply Sika Reemat into the wet embedment resin and roll the scrim to achieve full saturation and embedment. Reemat shall be cut to conform to substrate transitions and flashing conditions, with a typical 2” (50.8 mm) reinforcement overlap. Resin shall saturate the Reemat from below. Apply additional Sikalastic®-624 WP resin as required to ensure full scrim embedment. Allow to cure completely before applying subsequent resin layers.

Sika Reemat - Intermediate and Top Resin
Apply Sikalastic®-624 WP resin to the cured Sikalastic®/Reemat base layer by means of 1/2” (12.7 mm) nap phenolic resin core roller or brush at the specified application rate to achieve a uniform and consistent wet mil thickness (reference separate System Data Sheet). Material can also be squeegee or spray applied, in which case it should also be backrolled. Allow to cure completely before applying subsequent resin layer, if specified.

Sika Fleece
Apply Sikalastic®-624 WP resin to the primed substrate surface by means of 1/2” (12.7 mm) nap phenolic resin core roller or brush to achieve a uniform and consistent thickness, applying approximately 2/3 of the resin required to achieve the specified application rate (reference separate System Data Sheet). Apply Sika Fleece into the wet embedment resin and roll the fleece to achieve partial saturation and full embedment. Fleece shall be cut to conform to substrate transitions and flashing conditions, with typical 3” (76.2 mm) side and 6” (152.4 mm) end reinforcement overlaps. Resin shall saturate the Fleece from below. Apply remaining 1/3 of the specified resin quantity to ensure full fleece saturation and an even resin application.

Clean all tools and application equipment with appropriate solvent immediately after use. Hardened and/or cured material can only be removed mechanically

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