• Extreme Flexibility: +100% / -50% movement capability (ASTM C719)
• Low-Modulus Performance: Reduces stress on joint substrates
• Non-Sag Formula: Ideal for vertical joints and façade applications
• Durable & Elastic: Cures to a strong, flexible rubber with high tear resistance
• Excellent Adhesion: Bonds to concrete, aluminum, glass, and more—often without primer
• Weather & UV Resistant: Maintains integrity in extreme climates
• Easy to Use: One-component, gun-grade, no mixing required
• Paintable & Jet Fuel Resistant
• Certified for EIFS & Fire-Rated Joint Systems
• Meets ASTM C920 Class 100/50: For high movement joints

Sikaflex® 15 LM is ideal for dynamic joints in vertical, exterior, or façade applications where high movement is expected:

• Expansion and control joints
• Precast concrete wall panels
• Window and door perimeters
• Flashing, reglets, and EIFS joints
• Roofing detail applications
• High-rise and curtain wall installations
• Fire-rated joint systems (UL listed)

Common Substrates:

• Concrete
• Glass
• Aluminum
• EIFS
• Wood
• Stucco
• Masonry (CMU, brick)
• Precast panels

Surface Preparation

• Substrates must be clean, sound, dry, and free of dust, oil, and frost
• Roughening surfaces enhances adhesion
• Use backer rod or bond breaker tape to control sealant depth and prevent 3-point bonding
• Priming is generally not required unless bonding to porous or specialty substrates like EIFS

Joint Design

• Joint depth should be ¼" minimum and ½" maximum
• Ideal width-to-depth ratio is 2:1
• Sealant should be applied at the joint’s midpoint in its movement range

Application Conditions

• Air/Substrate Temp: +40°F to +100°F
• Tack-Free Time: 2–6 hours
• Final Cure: 7–10 days
• Paintable: Yes (test for compatibility)

Coverage (10.1 oz cartridge, based on ¼" bead)

• ¼" x ¼" joint = 24.3 linear ft
• ½" x ½" joint = 6.1 linear ft

Cleanup

• Use xylene or similar solvent for uncured material
• Cured sealant must be removed mechanically