Sikalastic®-325 Lo-VOC

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)

-22–176 °F (-30–80 °C) intermittent

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

41 °F (5 °C) min. / 95 °F (35 °C) max

80 % R.H. max

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

41 °F (5 °C) min. / 140°F (60°C) max.

*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.

Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.

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.
 

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.

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

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.

Sikadur®-22 Lo-Mod FS- For concrete with a maximum moisture content of 4 % by weight, plywood decks, aluminum, steel, carbon steel, stainless steel, PVC, and existing polyurethane coatings, apply a single coat application of Sikadur®-22 Lo-Mod FS with a flat squeegee or roller at approximately 10 mils at 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® 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.

Sikalastic® 100 VB - For concrete with a maximum moisture content of 5 % by weight, apply Sikalastic® 100 VB with a flat squeegee or roller at approximately 10 mils (~160 sf/gal). For concrete decks with a maximum moisture content of 6% by weight or applications, apply two applications of Sikalastic® 100VB with a flat squeegee or phenolic resin roller at approximately 10 mils (~160 sf/gal) per application. Work primer well into the substrate to ensure adequate penetration. Apply evenly without puddling. For applications as a moisture barrier and additonal infomation refer to seperate primer data sheet.

No mixing necessary

Primer
Apply a primer suitable for the substrate. Allow primer to cure completely before applying Sikalastic®-325 Lo-VOC resin.

 
Detailing
Non-structural cracks up to 1/16'': Detail application not necessary. Apply embedment/base resin layer per below.
Non-structural cracks between 1/16'' and 1/4'': Rout and seal with Sikaflex® sealant. Apply 40-45 mil resin layer embedded with 3 inch Sika® Flexitape Heavy centered over crack. Alternativly Sika® Joint Tape SA can be applied. Apply embedment/base resin layer per below.
Cracks and joints between 1/4'' and 1'': Rout and seal with Sikaflex® sealant. Apply bond breaker tape sufficient to span width of crack or joint followed by 40-45 mil resin layer embedded with 6'' Sika® Flexitape Heavy centered over crack or joint. Apply embedment/ base resin layer by terminating Sika® Reemat Premium at edges of crack or joint overlapping Sika® Flexitape Heavy a minimum of 2'' on both sides.
Joints greater than 1'': Treat as expansion joint. Consult Sika for recommendations.
Metal seams and plywood/coverboard joints: Apply 40–45 mil resin layer embedded with 3 or 6'' Sika® Flexitape Heavy centered over seam. Alternatively, Sika® Joint Tape SA can be applied centered over seam. Apply embedment resin layer per below.  

System Application

Sika® Reemat - Base Resin
Apply Sikalastic®-325 Lo-VOC resin to the primed substrate surface by dip and roll application with 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. Material can also be squeegeed, in which case it should also be backrolled. Place Sika® Reemat in wet base resin layer overlapping seams a minimum of 2'' (place frayed edge over cut edge of roll) and apply wet roller to topside to saturate completely. After approximately 5 minutes the binder will begin to dissolve allowing the fiber strands to conform to irregular surfaces. Do not over work once the fibers have conformed to the substrate. 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. Resin shall saturate the Reemat from below. Apply additional Sikalastic®-325 Lo-VOC 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®-325 Lo-VOC 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. Material can also be squeegeed, in which case it should also be backrolled. Allow to cure completely before applying subsequent resin layer, if specified.

Clean all tools and application equipment with appropriate solvent immediately after use. Hardened and/or cured material can only be removed mechanically.