Sika Corporation -Liquid Applied Waterproofing Membrane - Sikalastic®-624 WP

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


Category: below grade waterproofing and dampproofing | damproofing | membrane waterproofing...

MasterFormat: Dampproofing and Waterproofing


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Overview


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

APPROVALS / STANDARDS
  • 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

Chemical Base

Moisture triggered Polyurethane

Shelf Life

9 months (Unopened Container)

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)

Technical Information

Chemical Resistance

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

Application

Application Information

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.)

Application Steps

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 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


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Specifications

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 thickness15sf/gal - 105 mils wet film thickness
40 sf/gal - 40 mils wet film thickness19 sf/gal - 85 mils wet film thickness
35 sf/gal - 45 mils wet film thickness23 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.

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.

Resistance to Static Puncture

Ref. reinforced system data

(ASTM D-5602)

Solid content by volume

71 %

(ASTM D-2697)

Tensile Strength

Ref. reinforced system data

(ASTM D-751)

Volatile organic compound (VOC) content

209 g/l

(ASTM D-2369-81)