WATERPROOFING

The SEMCO Liquid Membrane is a single component water-based waterproofing and anti-fracture membrane. It is a self-contained elastomeric fluid suspended in a copolymer adhesive, this revolutionary blend enables easy application while providing excellent bridging, and waterproofing.

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The numbers that matter.

Membrane coverage~200 sq ft per gallon at 2 coats
Submerged coverage~100 sq ft per gallon at 3 coats · add Color Activator
Each coat15–20 mil · thin and even
ElongationUp to 1,300% · 1,375% at break (AS 4858.1)
Shear bond strength173 PSI at 7 days · 234 PSI at 4 weeks · 132 PSI after 7-day immersion (ANSI A118.10)
Tensile strength453 PSI (ISO 37 / ASTM D412)
Vapor permeability0.135 perm-in (ASTM E96)
VOC14 g/L · low-VOC, water-based
Recoat windowWhen it holds no fingerprint — same day
Dry to touch1–2 hours at ~70°F
Initial cure7 days minimum · longer if thick, cool or humid
Temperature50–90°F · out of direct sun
Max substrate moisture3%
Fabric ReinforcementCracks over ¼", joints and seams · 6" × 75 ft or 29.5" × 100 ft
CleanupWarm water, straight after use