Sikalastic®-320 NS

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

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

See Product Safety Data Sheet

-25–200 °F (-31.7–93.3 °C)

Application on Green Concrete

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

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

Surface must be clean, dry and sound with an open texture. Remove dust, laitance, grease, curing compounds, bond inhibiting impregnations, waxes, and any other contaminants. All projections, rough spots, etc. should be dressed off to achieve a level surface prior to application.

Concrete - New concrete must be cured a minimum of 28 days prior to application. Old concrete must be free of loose aggregate, dirt and be dry. New and old concrete should be Shot-, Water- or Abrasive-blasted. Grease spots and oil should be chemically cleaned with appropriate cleaners or mechanically removed.

Green Concrete ( less than 28 days): Sikalastic®-320 NS must be applied direct on green concrete without primer. Substrate must have an open textured surface to allow Sikalastic®-320 NS to acheive adhesion. If green concrete surfaces have Concrete Surface Profile (CSP) of 2 to 5, powerwashing the surface may be the only surface preparation method required to remove any concrete laitance. If the green concrete surfaces do not have a Concrete Surface Profile (CSP) of 2 to 5, reprofiling by blast cleaning and grinding are considered acceptable means to achieve the desired surface profile. Acid and chemical etching are not acceptable means to achieve the desired surface profile. Some warranties require primer, consult Sikalastic 320 System Guidelines for requirements and/or additonal information prior to application.

Plywood - The only acceptable grade of plywood is APA rated exterior grade or better. The appearance and physical characteristics of the plywood and grade should be considered. Plywood should be new or cleaned and sanded.

Metal - Metal must be in sound condition. The surface should be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, corrosion products and other foreign matter. Be aware of dew point and check it before every application on metal surface.

• Ferrous Metals: Must be prepared to SSPC-SP6/NACE 3. For areas where SSPC-SP6/NACE 3 is prohibited or not feasible, substrate can be thoroughly cleaned by grinding or other power tools per SSPC-SP11.
• Non-Ferrous Metals: Prepare to a bright metal surface. Wire brushing can be used for soft metal such as copper or lead.
• Galvanized Steel: White rust must be removed from galvanized steel, with care taken not to damage or remove the galvanizing.
• Stainless Steel: Must be mechanically abraded or ground to create an appropriate anchor profile.

PRIMING

Some warranties and/or substrates may require the use of a primer. See “Sikalastic® 320 Warranty Guidelines” for more information.

For applications with primer over concrete, the primer used will depend on the moisture level of the concrete. Measure the moisture content of concrete substrate with a Tramex CME or CMExpert type concrete moisture meter.

Do not prime over an existing crack and joint detail coats.

PRIMER SELECTION

Sikadur®-22 Lo-Mod FS - For concrete with a maximum moisture content of 4 % by weight, plywood decks, aluminum, steel, carbon steel, stainless steel, and existing polyurethane coatings, apply a single coat application of Sikadur®-22 Lo-Mod FS with a flat squeegee or roller at approximately 160 sf/gal. Apply evenly without puddling. Allow primer to cure until tack-free, typically 2-4 hours (at 75°F (24°C) 50% R. H). Sikadur®-22 Lo-Mod FS should be overcoated within 36 hours after tack-free. Refer to a separate product data sheet for additional information.

Sikalastic® FTP Lo-VOC Primer - For plywood decks, concrete with a maximum moisture content of 5 % by weight, apply a single coat of Sikalastic® FTP LoVOC Primer with a flat squeegee or roller at approximately 175 sf/gal. Work primer well into the substrate to ensure adequate penetration and sealing. Apply evenly without puddling. Refer to separate primer data sheet for additional information.

Sikalastic® MT Primer - For concrete with a maximum moisture content of 5 % by weight, apply a single coat application of Sikalastic® MT Primer with a flat squeegee or roller at approximately 175 sf/gal. For concrete decks with a maximum moisture content of 6% by weight, apply two applications of Sikalastic® MT Primer with a flat squeegee or phenolic resin roller at approximately 175 sf/gal per application. Work primer well into the substrate to ensure adequate penetration and sealing. Apply evenly without puddling. Refer to a separate primer data sheet for additional information.

Sikalastic® EP Primer/Sealer- For Wood (timber, plywood) and Metal (steel, carbon steel, galvanized steel, stainless steel, aluminum, brass, lead, copper). 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.

Sikalastic® PF Lo-VOC Primer - For concrete with a porous or rough surface and a maximum moisture content of 4 % by weight, plywood decks and steel, use Sikalastic® PF Lo-VOC Primer. Apply Sikalastic® PF Lo-VOC Primer with a flat squeegee or phenolic resin core roller at approximately 200 sf/gal. and work well into the substrate to ensure adequate penetration and sealing, and puddles are avoided. Refer to separate primer data sheet for additional information.

NOTE: For rough or porous concrete or when outgassing is a concern, use Sikadur® 22 Lo-Mod FS, Sikalastic FTP LoVOC or Sikalastic® PF LoVOC Primer at an approximate rate of 80-160 sq.ft/gal. This rate may vary on the porosity of the substrate. The surface must be totally covered with primer with no dry spots or spots where the primer has completely absorbed into the substrate, multiple coats may be required. Allow primer to become tack free before proceeding to the next phase.

Sikalastic®-320 NS should be thoroughly mixed using a mechanical mixer and jiffy style paddle at slow speed for a minimum of 2 minutes 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.

Optional Water Catalyst:

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.

DETAILING:

For moving and non-moving cracks less than 1/16” width: Apply a 30 mil detail coat of Sikalastic®-320 NS, extending 2” on either side and centered over the crack.

For cracks 1/16” width or greater and less than 1” width: Must be routed to at least ¼” by ¼”, and sealed with an appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 30 mil detail coat of Sikalastic®-320 NS, extending 2” on either side and centered over the crack. Non-moving cracks can be filled with compatabile rigid repair materials.

NOTE: Cracks may indicate a structural issue and should be addressed by a structural engineer or appropriate design professional.

For joints 1/16” or greater and less than 1.5” width: Joints should be sealed with the appropriate Sikaflex® sealant, installed per sealant Product Data Sheet, and coated with a 30 mil detail coat of Sikalastic®-320 NS, extending 2” on either side and centered over the crack.

For expansion joints 1.5” or greater width: Should be treated as expansion joints and brought up through the Sikalastic®-320 NS membrane and/or Emseal Expansion Joint System, Sikadur Combiflex SG or other appropriate joint sealing system should be used. Contact Sika Technical Services for recommendations prior to application.

Fabric reinforcement - Sika does not require reinforcing of the detail coat when going over cracks and joints.  In situations where reinforcing detail coats is required, use a 3” wide strip of Sika Flexitape Heavy as the reinforcing.  Please see the Sika Flexitape Heavy product data sheet for installation instructions.

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).

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.

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