Joint sealant 1A plus | Sikaflex | joint sealant

  • Sikaflex®-1A PLUS: Elastic joint sealing for building envelopes and EIFS facades
  • Exceptional weathering resistance
  • ±50% movement capability (ASTM C 719)
  • Bubble-free curing for a flawless finish
  • Low stress to the substrate, superior adhesion
  • Easy application, excellent workability
  • Solvent-free, very low emissions
  • Category:
  • 500 in stock

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    Sikaflex®-1A PLUS: Superior Joint Sealant

    High-performance, professional joint sealant for concrete, masonry, and EIFS facades

    Sikaflex®-1A PLUS is intended for the waterproofing of movement and connection joints in building envelopes. Sikaflex®-1A PLUS is also suited for EIFS Facades because to its extremely low modulus.


    • Excellent weathering resistance
    • Movement capability of ±50% (ASTM C 719)
    • Bubble-free curing
    • Low stress to the substrate
    • Excellent extrusion and workability
    • Good adhesion to many different substrates
    • Solvent-free
    • Very low emissions

    Application steps

    Substrate Preparation
    The substrate must be devoid of oils, grease, dust, and loose or friable particles, and it must be clean, dry, sound, and uniform. Sikaflex®-1A PLUS attaches without the need of primers or activators.
    However, the following priming and pre-treatment methods must be performed for optimum adhesion and crucial, high-performance applications, such as multi-story structures, highly stressed joints, harsh weather exposure, or water immersion:
    Non-porous substrates
    Aluminum, anodized aluminum, stainless steel, galvanized steel, powder-coated metals, and glazed tiles must be cleaned and pre-treated with Sika® Aktivator-205 before being wiped clean. Allow for a flash-off duration of at least 15 minutes (6 hours) before sealing.
    Other metals, such as copper, brass, and titanium-zinc, must be cleaned and pre-treated with Sika® Aktivator-205 before being wiped clean. After the required flash-off time, apply Sika® Primer-3 N with a brush and allow a further flash-off time of > 30 minutes (8 hours) before sealing the joints.
    Sika® Primer-215, which is applied with a brush, must be cleaned and pre-treated on PVC. Allow for a flash-off duration of at least 30 minutes (8 hours) before sealing. 

    Porous substrates

    Sika® Primer-3 N, applied with a brush, should be used to prime concrete, aerated concrete, cement-based renders, mortars, and bricks. Allow for a flash-off duration of at least 30 minutes (8 hours) before sealing.

    Cleaning of Tools

    Sika® Remover-208 and Sika® Cleaning Wipes-100 should be used immediately after use to clean all instruments and application equipment. Once the leftover substance has cured, it can only be removed manually.

    Shelf Life

    Sikaflex®-1A PLUS Joint Sealant has a shelf life of 15 months if stored in undamaged, original, unopened packaging and meets the storage criteria.




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