Waterproofing Coating - Sikalastic®-320 NS

SINGLE COMPONENT, NON-SAG, BITUMEN MODIFIED WATERPROOFING MEMBRANE

Sikalastic®-320 NS is a single component, Non-Sag, liquid applied, bitumen modified, coal tar free, moisture cured polyurethane waterproofing membrane.

• Easy Application
• Applies on green and damp concrete
• Can be applied horizontally and vertically
• Alkali Resistant
• Quick Re-coat time
• Apply vertically up to 90 mils
• Solvent Free
• Meets the requirements of ASTM C 836
• Ability to catalyze with water
  • Faster cure rate
  • Reduce chance of pinholes from concrete outgassing

Usage

• Planters
• Between Slabs
• Plazas and Pavers
• Foundation Walls
• Bridges and Tunnels

Advantages

• Easy Application
• Applies on green and damp concrete
• Can be applied horizontally and vertically
• Alkali Resistant
• Quick Re-coat time
• Apply vertically up to 90 mils
• Solvent Free
• Meets the requirements of ASTM C 836
• Ability to catalyze with water
  • Faster cure rate
  • Reduce chance of pinholes from concrete outgassing

Packaging

5 gallon (18.9 liter) pail.

55 gallon drum, net fill 50 gallons (189 liters)

Color

Black

Product Details

Product Information

Shelf Life

12 months from date of manufacture in original, factory-sealed containers

Storage Conditions

Store indoors at temperatures between 65-85 °F (18-30 °C)

Volatile organic compound (VOC) content

See Product Safety Data Sheet

Technical Information

Service Temperature

-25-200 °F (-31.7-93.3 °C)

Application

Application Information

Waiting / Recoat Times

Application on Green Concrete

Horizontal: 48 hours or walkable conditions
Vertical: 24 hours after forms removed

Consumption

Coverage

50 ft²/gal results in 30 ± mils DFT
25 ft²/gal results in 60 ± mils DFT (standard)
18 ft²/gal results in 90 ± mils DFT
13 ft²/gal results in 120 ± mils DFT

Application Steps

SUBSTRATE PREPARATION

Surfaces may be dry or damp, but must be sound and free of standing water, dust, laitance, grease, curing compounds, impregnations, waxes and any other contaminants. Scratch and remove sheen for metal surfaces before applying primer. Scratch marine grade and high density plywood with sandpaper before applying primer.

MIXING

Before application, Sikalastic®-320 NS should be thoroughly mixed using a mechanical mixer and jiffy style paddle at slow speed for 2 minutes minimum to ensure a homogeneous material. Take care not to allow entrapment of air into the material. Do not mix in an up and down motion.

Using Optional Water Catalyst: Before application, mix Sikalastic®-320 NS using a mechanical mixer and jiffy style mixing paddle at a slow speed. At a ratio 1 part of water to no less than 40 parts Sikalastic®-320 NS. For a 5 gal pail, add 1 pint (16 oz) of water (less water may be used to extend working time). Use care not to allow the entrapment of air into the mixture. Do not mix in an up and down motion. Once water is mixed with Sikalastic®-320 NS apply within 20 minutes.

APPLICATION

Sikalastic®-320 NS may be applied with a brush, squeegee, trowel, or roller. Apply up to 90 mils vertically and 120 mils horizontally per coat. Mix Sikalastic®-320 NS with water to greatly reduce the chance of pinhole formation from concrete out-gassing and improve cure rate. Cured membrane must be pinhole free after application to validate warranty. (Contact Sika Technical Services for Plaza Deck applications where vegetation is planned).

Priming: Some warranties and/or substrates may require the use of a primer. Use the following primers accordingly: Sikadur® 22 LM FS for concrete, PVC and marine-grade or high-density plywood;Sikaflex® Primer 449 for PVC; Sikalastic Recoat Primer for Fiberglass; and Sikalastic® PF Lo-VOC Primer for all other surfaces including concrete, EIFS, DensGlass, metal, and marine-grade or high-density plywood.

Joints, Cracks, and Flashing: For all cracks up to 1/16” width apply a 4” wide, 30 mil stripe coat of Sikalastic®-320 NS centered over the crack. All cracks over 1/16” width must be routed to at least ¼” by ¼” sealed with the appropriate Sikaflex® sealant and coated with a 4” wide, 30 mil stripe coat centered on the sealant. When sealing green concrete, use Sikaflex®-1a. Sealant may be overcoated when tack-free. Sika Flexitape Heavy reinforcing fabric may be required for metal flashing transitions, plywood seams, and expansion joints by embedding reinforcing in 15 mils of membrane then coating with another 15 mils of membrane.

Curing and Recoating: At 75 °F (24 °C) and 50 % relative humidity, allow each coat of Sikalastic®-320 NS to cure 16-24 hours* minimum. When using water as a catalyst: allow Sikalastic®-320 NS to cure a minimum of 2-4 hours* before proceeding to subsequent coats. If more than 48 hours pass between coats the surface must be solvent wiped and primed with Sikalastic® Recoat Primer.

Flood Test: After Sikalastic®-320 NS has cured (16-24 hours), plug drains, and provide proper means to contain flood water. Flood deck with a 2” head of water and allow to stand for 24 hours. Check for leaks and immediately make repairs if required. Retest after any repairs have been made. If a flood test cannot be completed within 3 days of application, cover Sikalastic®-320 NS with a protection course to prevent damage from other trade work until a successful flood test is completed.

Membrane Protection: As soon as possible after completion of a successful flood test, visual inspection and/or repairs, cover membrane with an approved drainage mat or protection board. Sikalastic®-320 NS should not be exposed to sunlight or UV radiation for more than 14 days.

CLEANING OF TOOLS

Equipment should be immediately cleaned with an environmentally safe solvent, as permitted under local regulations.

Details

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