Sikalastic®-624 WP
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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
- Resitant to ponding water
- 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 waterproofing systems reinforced with Sika Reemat
- Saturating resin for Sikalastic® RoofPro waterproofing 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
- Resitant to ponding water
- 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, Pearl Gray, Custom Color available with minimum order quantity
Product Details
APPROVALS / STANDARDS
- Miami Dade
- ASTM C836
- ASTM E-108
- Florida Building Code
Chemical Base
Single component, moisture triggered aliphatic Polyurethane
Shelf Life
9 months
Storage Conditions
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
Density
10.8 lb./gal. (1294 kg/m3)
Solid content by volume
| 71 % | (ASTM D-2697) |
Volatile organic compound (VOC) content
| 209 g/l | (ASTM D-2369-81) |
Resistance to Static Puncture
| Ref. reinforced system data | (ASTM D-5602) |
Tensile Strength
| Ref. reinforced system data | (ASTM D-751) |
Chemical Resistance
Most common roofing contaminants, oils, grease, dilute acids and bases
Application
Ambient Air Temperature
41 °F (5 °C) min. / 95 °F (35 °C) max.
Relative Air Humidity
80 % R.H. max.
Dew Point
Beware of condensation.
The substrate and uncured coating must be ≥ 5 °F (3 °C) above dew point.
Substrate Temperature
41 °F (5 °C) min. / 140°F (60°C) max.
Substrate Moisture Content
≤ 4 % moisture content Test method: Sika®-Tramex meter
No rising moisture according to ASTM (Polyethylene-sheet)
Pot Life
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.)
Cure Time
| Ambient conditions | Minimum waiting time overcoating |
| +40 °F / 50 % r.h. | 14 hours |
| +50 °F / 50 % r.h. | 6 hours |
| +70 °F / 50 % r.h. | 5 hours |
*After 7 days the surface must be cleaned and primed with Sika® Reactivation Primer before continuing.
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Applied Product Ready for Use
| Ambient conditions | Rain resistant | Touch dry | Full cure |
| +40 °F / 50 % r.h. | 10 min. | 12 hours | 24 hours |
| +50 °F / 50 % r.h. | 10 min. | 6 hours | 18–24 hours |
| +70 °F / 50 % r.h. | 10 min. | 4 hours | 12–18 hours |
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Coverage
| Sika Reemat | Sika Fleece |
| 53 sf/gal - 30 mils wet film thickness | 15sf/gal - 105 mils wet film thickness |
| 40 sf/gal - 40 mils wet film thickness | 19 sf/gal - 85 mils wet film thickness |
| 35 sf/gal - 45 mils wet film thickness | 23 sf/gal - 70 mils wet film thickness |
NOTE: Coverage rates are optimal - coverage rates will vary depending on temperature, surface roughness and porosity, and application technique.
MIXING
No mixing necessary
APPLICATION
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 torn/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.
CLEANING OF TOOLS
Clean all tools and application equipment with appropriate solvent immediately after use. Hardened and/or cured material can only be removed mechanically