Sikalastic®-702

Elastomeric PU/PUA hybrid

12 months for both A & B components

Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between 41°F(+5°C) and 86°F(+30°C). Always refer to packaging.

3.86 g/L

~100 % (Part A & B)

~100 % (Part A & B)

Exposed System - Chemical Containment or Cooling Tower Areas with Sikalastic - 702/701 SF

Exposed Unreinforced System with Sikalastic - 702/701 SF

Unreinforced Protected Membrane System with Sikalastic -702

Optional Reinforced Systems - 702 or 702/701 SF (local or fully reinforced)***

**Allow each layer to cure before applying the consecutive layer.
***Localized Reinforcement: Prior to applying the specified coating system install Sika Joint Tape SA or PAREX Synergy Reinforcing Mesh 355 set in a wet base coat of Sikalastic 702 or Sikalastic 702 THX. Center the reinforcement over all laps, seams, cracks, joints and transitions of dissimilar material.

Note:

• For unreinforced system, a substrate evaluation is required
• Approved substrates: Concrete Slabs, Concrete, Cementitious, Metals
• Protection layer is required between membrane & overburden
• Sikalastic 702 THX is required for all sloped & vertical surfaces
• Sikalastic 702 & 702 THX must be overcoated within 48 hrs. with Sikalastic 701 SF
• Where slip resistance or walkway is required, broadcast to refusal a min. 16/30 or 20/40 oven dried silica sand into the second top coat of 701 SF while still wet
• Adhesion key for cementitious overlay, broadcast to refusal a min, 30/60 oven dried silica sand into the additional coat of 702

Value measured using Sika® Concrete Primer LO

Resistant to many chemical based cleaners. Contact Sika Technical Services for additional information.

Part A : Part B = 1 : 1.72 (by weight)

50°F(+10°C) min. / 77°F(+25°C) max.

35.6°F(+2°C) min. / 104°F(+40°C) max.

35 % min / 80 % max.

Beware of condensation.
The substrate and uncured applied membrane must be at least 35.6°F(+2°C) and 5°F above the dew point (air and substrate) to reduce risk of condensation or blooming on the membrane finish.

35.6°F(+2°C) min. / 104°F(+40°C) max.

≤ 4 % parts by weight.

The following test methods can be used: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM (Polyethylene-sheet).

~25 minutes at 68°F(+20°C)
Pot life will decrease at higher temperatures and increase at lower temperatures.

• The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.
• Suitable substrates: Concrete Slabs, Concrete, Cementitious, Metals, Asphaltic BUR's, bituminous felts and coatings, brickwork, asbestos cement. 
• All existing surfaces must be sound, well addered and/or completely attached to stucture. All deleterious materials must be removed and replaced with like in kind

Concrete and Cementitious Substrates
New concrete shall be allowed to cure a minimum of 28 days. Concrete shall have a minimum compressive strength of 20.7 MPa (3000 psi) and exhibit a minimum tensile bond strength of 1.4 MPa (200 psi). time. Moist or sheet curing methods should be used, as opposed to the use of curing compounds, which may interfere with the bond of the membrane. Inspect the concrete, including upstands, and all areas should be hammer or chain drag tested. Concrete must be suitably finished, preferably by wood float or steel pan. A power float finish is acceptable where the surface is prepared to avoid laitance (a tamped finish is not acceptable). The surface finish must be uniform and free from defects such as laitance, voids or honeycombing.

Cementitious or mineral based substrates must be prepared mechanically using abrasive blast cleaning or scarifying equipment to remove cement laitance and to achieve an open textured surface (CSP 2-4 per ICRI guidelines). Loose friable material and weak concrete must be completely removed and surface defects such as blowholes and voids must be fully exposed. The amount of embedment coat required may increase over rough or highly porous surfaces. Repairs to the substrate, filling of joints, blowholes/voids and surface levelling must be carried out. Consult Sika for product recommendations based on project requirements. High spots must be removed by grinding or similar method. Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in liquid applied materials. The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any roofing work. Particular requirements for priming must also be considered. Installing the primer and membrane either when the concrete temperature is falling or stable can reduce outgassing. It is generally beneficial, therefore, to apply the primer and embedment coat in the late afternoon or evening.

Brick 
Mortar joints must be sound and preferably flush pointed. Power wash and use biodegradeable non-sudsing detergent with clean water rinse as required.

Asphalt
Asphalt contains volatiles which can cause bleeding and slight non-detrimental staining. The asphalt must be carefully assessed for moisture and/or air entrapment, grade and surface finish. Power wash and use biodegradeable non-sudsing detergent with clean water rinse as required. All major cracks should be sealed to allow continuity of the Sikalastic® system.

Bituminous Roofing
Ensure that bituminous roofing is firmly adhered or mechanically fixed to the substrate. Bituminous roofing shall not contain badly degraded areas. Power wash and use biodegradeable non-sudsing detergent with clean water rinse as required. Treat blisters by star cutting and removing any underlying water. Allow to dry and readhere using suitable adhesive

Bituminous Coatings
Bituminous coatings should not be sticky or mobile. Volatile mastic coatings, or old coal tar coatings are not acceptible. Remove any loose or degraded coatings.

Metals
Metals must be in sound condition. Ferrous metals should be thoroughly cleaned by grinding or blast cleaning prior to priming (SSPC-SP3 to SP11 near-white metal). Non-ferrous metals are prepared by removing any deposits of dust and oxidation and abrading to bright metal. Wire brushing can be used for soft metal such as lead. The surface must be clean and free from grease which, if present, must be removed with a solvent wipe or wash with detergent, rinse and dry. Stainless Steel must be mechanically abraded or ground to create an appropriate anchor profile.

Paints and Coatings (Sika technical evaluation required)
Ensure the existing material is sound and firmly adhered. Remove any loose or degraded coatings. Ensure the surface is clean and free from oxidation, dust, dirt, and debris. Power wash and use biodegradable non-sudsing detergent with clean water rinse as required. Allow to dry

Existing Membrane Roofing
The existing Membrane System shall be soundly adhered to the substrate. Clean the membrane using a pressure washer at approximately 140bar (2000 psi) and biodegradeable non-sudsing detergent with clean water rinse. Allow to dry.

IMPORTANT
Do not dilute.
RESIN MIXING PROCEDURE
1. Mix Part A (resin) with a mechanical mixer (Jiffy) at slow speed until the colored pigment is dispersed and a uniform color is achieved.
2. Add Part B (hardener) to Part A.
3. Using a mechanical mixer (Jiffy) at slow speed, mix Part A + B continuously for ~3 minutes until a uniformly colored mix is achieved. IMPORTANT Do not mix excessively.
4. During the final mixing stage, scrape down the sides and bottom of the mixing container with a flat or straight edge trowel at least once to ensure complete mixing

PRIMER MIXING
Refer to individual primer Product Data Sheets for proper mixing instruction

Detailing

Sloped & Vertical Surfaces
Apply Sikalastic 702 THX as the base resin.

Non-structural Cracks Up To 1/16''
Detail application not necessary. Apply embedment/base resin layer per instruction. Non-structural cracks between 1/16'' and 1/4'' Rout and seal with Sikaflex® sealant. Apply 3'' Sika® Joint Tape SA centered over the crack. Apply embedment/base resin layer per instruction.

Cracks and Joints Between 1/4" and 1'' and above
Consult Sika

Transitions Between Dissimilar Materials
Apply Sika® Joint Tape SA centered over edge or PAREX Reinforcing Mesh 355 set in a base coat of Sikalastic 702 THX. Apply embedment/base resin layer per instruction

Base Resin Layer
Apply mixed Sikalastic® -702 using a notched squeegee, roll with a spiked pin roller and allow to cure.
Cure a minimum 6 hours at 70 °F and 50 % R.H. or until tack free before top resin layer. Keep clean and dry and apply top resin layer within 48 hours. If window of 48 hours is exceeded but less than 7-days clean with non-sudsing detergent, clean water rinse, and allow to dry prior to application of Sika® Reactivation Primer. If 7 or more days has lapsed a light surface grinding is required. Surface must be clean and dry prior to applying Sika® Reactivation Primer and top coat resin.

Base Embedment Layer with PAREX Reinforcing Mesh 355
Apply mixed Sikalastic® -702 using a notched squeegee, roll with a spiked pin roller, embed the Parex reinforcement into wet base coat and back roll or trowel to fully encapsulate the reinforcement, allow to cure before next coats.
Cure a minimum 6 hours at 70 °F and 50 % R.H. or until tack free before top resin layer. Keep clean and dry and apply top resin layer within 48 hours. If window of 48 hours is exceeded but less than 7-days clean with non-sudsing detergent, clean water rinse, and allow to dry prior to application of Sika® Reactivation Primer. If 7 or more days has lapsed a light surface grinding is required. Surface must be clean and dry prior to applying Sika® Reactivation Primer and top coat resin.

Aggregate Surfacing
For foot traffic and cementitious overburden adhesion key.
Supplemental aggregate surfacing is required for all applications that will experience direct foot traffic such as balconies, terraces, walkways, and plazas. It is also recommended for areas that experience maintenance foot traffic. Aggregate surfacing is applied in a supplemental resin layer after the Sikalastic membrane has been installed. Aggregate is not applied into the roofing/waterproofing resin top coat.
 

Full Broadcast and Seal Option
The Full Broadcast and Seal option is intended for use for applications where both enhanced slip resistance and physical protection of the roofing membrane is required. Apply Sikalastic®- 701 SF resin at 10-12 mils wet film thickness to the installed, cured membrane system. While the supplemental resin application is still wet broadcast to rejection (full broadcast/beach) with kiln dried, iron free aggregate. Remove excess aggregate after cure. Seal with an additional coat of Sikalastic 701 SF (10-12 mils wft).

Aggregate Selection
Use clean, rounded or semiangular, oven dried quartz sand with a minimum hardness of 6.5 per the Moh’s scale. It should be supplied in prepackaged bags and free of metallic or other impurities. The following size gradations are recommended: ▪ 16/30 or 20/40 mesh for pedestrian traffic systems ▪ 30/60 for adhesion key, cementitious overlay.

Overburden Application
Sikalastic®-702 is used as the waterproofing layer under a wide range of overburden materials. Depending on the overburden type, different surfacing, drainage, and protection layers may be required.

Protected Membrane
Assemblies install Sika drainage mat over the Sikalastic®-702 or Sikalastic®-702/701 SF waterproofing system prior to adding the extruded polystyrene insulation layer. No aggregated membrane surfacing is required.


Concrete Pavers with Pedestal Supports
Install Sika drainage mat over the Sikalastic®-702 or Sikalastic®-702/701 SF waterproofing system to provide additional protection of the membrane under the pedestal supports. 

Cementitious or Thin-Set Adhesive
A full aggregate broadcast surfacing is required to provide an adhesion key for the tile adhesive. Apply a supplemental 20 wet mils of Sikalastic®-702 waterproofing resin, followed by a full broadcast of 30/60 kiln-dried sand to refusal, typically 40-50 lbs./100 sf. Remove all loose sand once resin has cured. Do not seal the aggregated surface.

 

Clean all tools and application equipment with Thinner C or similar, immediately after use. Hardened material can only be removed mechanically.