Polyurethane - 1 Component Pedestrian Traffic Coatings - Sikalastic®-325 Lo-VOC

MULTI-USE ONE COMPONENT REINFORCED LIQUID APPLIED WATERPROOFING MEMBRANE

Sikalastic®-325 Lo-VOC is a cold applied, highly elastic, aliphatic, single component, alkali resistant, moisture triggered polyurethane resin with reinforcement designed for use as a balcony waterproofing coating or below-grade waterproofing membrane.

• Balcony traffic capable with broadcasted topcoat
• Single component - no mixing and ready to use
• Alkaline resistant - suitable for under tile applications
• Fully reinforced with highly conformable Sika® Reemat Premium
• Moisture triggered chemistry that is rapidly weatherproof after application
• Low VOC formula - low odor
• Highly elastic and crack bridging
• Seamless and fully adhered
• Vapor permeable
• UV resistant and non-yellowing
• Abrasion and chemical resistant
• Adheres to most common construction materials when suitable primer is used

Usage

• Typical applications include:
  • Balconies
  • Vegetated Systems
  • Planters
  • Split-Slab waterproofing
  • Applications with cementitous overlays and tile mortar

Advantages

• Balcony traffic capable with broadcasted topcoat
• Single component - no mixing and ready to use
• Alkaline resistant - suitable for under tile applications
• Fully reinforced with highly conformable Sika® Reemat Premium
• Moisture triggered chemistry that is rapidly weatherproof after application
• Low VOC formula - low odor
• Highly elastic and crack bridging
• Seamless and fully adhered
• Vapor permeable
• UV resistant and non-yellowing
• Abrasion and chemical resistant
• Adheres to most common construction materials when suitable primer is used

Packaging

5 gal. (19 L) pails

Color

Gray

Product Details

Product Information

12 months in original, unopened and undamaged sealed containers

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

11.76 lb./gal. (1409.1 kg/m3)

Technical Information

Most common contaminants, oils, grease, dilute acids and base

Application

Application Information

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

Application Steps

Surface Preparation

All substrate surfaces shall be clean, dry, and sound. Acceptable substrates include: sound concrete and cementitious screed, metals, wood, modified bitumen, brick and stone, slate and tile, and existing liquid applied membranes.

Concrete and cementitious substrates

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 3-5 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 leveling 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 through 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 waterproofing 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. Do not apply on substrates with moisture content greater than 4 % by weight, measured by Tramex Concrete Moisture Encounter Meter.

Gypsum and Cement based sheathing

Sheathing boards shall be clean, dry and dust free. Secure loose boards if in sound condition. Damaged or contaminated boards shall be removed and replaced.

Brick and stone

Power wash and use biodegradable non-sudsing detergent with clean water rinse as required.

Asphalt

Power wash and use biodegradable non-sudsing detergent with clean water rinse as required. All major cracks should be sealed to allow continuity of the Sikalastic® Waterproofing system

Bituminous coatings

Remove any loose or degraded coatings.

Metals

Ferrous metals should be thoroughly cleaned by grinding or blast cleaning prior to priming (SSPC-SP3 to 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.

Wooden substrates

Timber and timber-based decks require additional reinforcement such as the installation of plywood, approved insulation or cover board. Small timber protrusions and suitable decks may be treated directly, provided that the timber is of exterior quality, e.g. plywood. Fill joints flush with Sikaflex® sealant.

Primer Selection:

Primer is required for all applications of Sikalastic®-325 Lo-VOC.

Sikalastic® Primer- For concrete decks with a maximum moisture content of 4 % by weight, apply Sikalastic® Primer with a flat squeegee or phenolic resin core roller at approximately 250 - 300 sf/gal. and work well into the substrate to ensure adequate penetration and sealing, and puddles are avoided. Sikalastic® Primer is not suitable for metal substrates. Refer to separate primer data sheet for additional information.

Sikalastic® EP Primer/Sealer- For Wood (timber, plywood) and Metal (aluminum, galvanized, cast iron, copper, lead, brass, stainless steel, steel, zinc). Apply by brush or phenolic resin core roller at the recommended rate,100-250 sf/gal depending on the substrate. Correct amount of primer will saturate the substrate and leave a slight film on the substrate top surface. Apply evenly without puddling. Refer to separate primer data sheet for additional information.

No mixing necessary

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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