SikaWall® Fastwall® Stucco Base Concentrate

ICC-ES Report ESR-2564 includes 1 hour fire-resistive assemblies.

▪ Binder: Portland cement.
▪ Reinforcement: Polypropylene fibers.
▪ Add sand conforming to ASTM C926 at job site.

12 months from date of production if stored properly in original, unopened and undamaged sealed packaging.

Store dry, off ground and protect from rain and moisture.

* These are typical laboratory test results but do not constitute a product specification.

Sets in 30-45 minutes after mixing, depending on conditions.

Depending on the condition of the substrate, thickness of application, and amount of sand added approximate coverages per bag are:

• at 3/8 in. (9.5mm): 75-90 ft² (6.97-8.36 m²)
• at 1/2 in. (12.7mm): 60-72 ft² (5.57-6.69 m²⁾ 
• Coverage may vary due to ambient temperature, surface temperature, surface porosity, mixing methods, application methods, amount of water, wall type and metal lath type. Coverage must be verified in the field using the same procedures and conditions that will be present at the project.

• On concrete masonry and poured concrete, apply only to surfaces that are sound, clean, dry, unpainted, and free of any residue which may affect the ability of SikaWall® Fastwall® Stucco Base Concentrate to bond to the surface.
• Solid bases shall have sufficient suction (ability to absorb water) or surface roughness or both to ensure an adequate bond for SikaWall® Fastwall® Stucco Base Concentrate.
• On lathed construction, apply to lathing installed in accordance with ASTM C1063.
• SikaWall® Fastwall® Stucco Base Concentrate requires a water-resistive barrier installed and flashed in accordance with the building code and to form a water-shedding surface. Stucco is not a water-resistive barrier.
• Install Water Resistive barrier (type and method of application) per specifications.
• Do not apply to substrates which are frozen or contain frost or ice. 
• Apply to surface prepared for portland cement plaster. Mix and install scratch and brown coats in accordance with ASTM C926.
• For additional surface preparation options contact Sika Technical Service.

• Use clean equipment for mixing and preparation.
• Start with approximately 3 gal (11.35 L) of clean potable water. And approximately 60 lbs. (27.2 kg) of the sand. Add 1 bag of SikaWall® Fastwall® Stucco Base Concentrate. Add remaining sand along with additional water- approximately 1-3 gal (3.8-11.35 L) for workability. Total amount of sand equals 2 ½ - 3 cubic ft (200-240 lbs or 91-109 kg). Allow the material to slake then break set. If needed, add water for workability.
• Use cool, potable water; let hose run to clear it of hot water.

• Sand: Sample and test in accordance with ASTM C897 or C144, and grade within the following
  limits:

• U.S Standards Sieve	Retained by Weight	Retained by Percent (+/- 2%)
  No. 4	--	0
  No. 8	0	10
  No. 18	10	40
  No. 30	30	65
  No. 50	70	90
  No. 100	95	100

• Use SikaWall® Fastwall® Stucco Base Concentrate immediately after mixing.
• Do not retemper SikaWall® Fastwall® Stucco Base Concentrate.
• SikaWall-73 Adacryl Admix & Bonder as an admix: use up to 1 gal (3.8L) per bag of SikaWall® Fastwall® Stucco Base Concentrate. After the dry components and the majority of the water has been mixed, add the acrylic admix in place of 1 gal (3.8L) of water. Mix no longer than required to provide a uniform mixture. DO NOT OVER-MIX. Over-mixing entrains excessive amounts of air which weaken the material. Do not re-temper mixes over 20 minutes old.
• Only Sika approved additives can be added to this product.

NOTE: If SikaWall-73 Adacryl Admix & Bonder is mixed into SikaWall® Fastwall® Stucco Base Concentrate and Portland cement-based stucco finish is used, then SikaWall-73 Adacryl Admix & Bonder must be used in the Portland cement-based stucco finish also. No unapproved additives are allowed.

• Read the entire label before using this product. For complete application procedures refer to ICC-ESR 2564. For more complete installation recomendations, see Sika system specification and details.
• Thoroughly dampen concrete and masonry substrate if necessary before applying SikaWall® Fastwall® Stucco Base Concentrate.
• Apply by hand trowel or plaster gun to a minimum 3/8 in. (9.5 mm) thickness. The maximum thickness applied in one pass should be 1/2 in. (12.7 mm).
• Level the surface directly after application or score horizontally to form a mechanical key for succeeding second coat. If applying SikaWall® Fastwall® Stucco Base Concentrate at a thickness greater than 1/2” or for large ceiling areas apply a second coat after allowing the first coat to dry.
• If additional SikaWall® Fastwall® Stucco Base Concentrate is not applied the same day, moisten the dry SikaWall® Fastwall® Stucco Base Concentrate as necessary before applying second coat.
• Keep stucco basecoat moist by fogging walls with water for the first 24-48 hours after initial hardening. Moist curing must be increased in dry weather and may be reduced in damp weather. Moist curing replaces water lost to evaporation and absorption. It improves hydration for strength and reduces volume-loss stresses. Insufficient moist curing can be a cause of cracking. Beyond 24 hours, additional moist curing may also be needed to provide sufficient strength to the basecoat to resist the pressure of finish coat application.
• After moist curing, allow the stucco basecoat to air dry and cure before the applicatoin of finish coat.
• For Portland cement-based stucco finish, lightly moisten the surface of SikaWall® Fastwall® Stucco Base Concentrate before application.