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At a Glance
Why Choose This Product
Forms a durable waterproof bond that accommodates movement
Bonds to HYDRO-BLOK panels and many construction materials
Applies cleanly on vertical and horizontal surfaces
Meets ASTM C920 requirements for construction sealants
Applies from 35Ā°F to 110Ā°F and performs from -60Ā°F to 225Ā°F
Designed for waterproof seams, transitions, penetrations, and panel joints
Product Information
HYDRO-BLOKĀ® Joint Sealant is a professional polyurethane sealant designed to create flexible, waterproof seals in wet-area installations. It is formulated for sealing seams, panel joints, transitions, and penetrations while maintaining long-term flexibility and adhesion.
The primerless formula bonds to HYDRO-BLOK panels and many common construction materials without requiring a primer. Its non-sag consistency allows clean application on both vertical and horizontal surfaces, making it suitable for showers, tub surrounds, and other waterproof assemblies.
With 250% elongation at break and compliance with ASTM C920 Type S, Grade NS, Class 25, Use NT, M, and A, the sealant is engineered to accommodate normal building movement while maintaining a durable waterproof bond.
HYDRO-BLOK Joint Sealant is ideal for sealing panel-to-panel connections, assembly joints, transitions, and penetrations in waterproof installations. It applies in temperatures from 35Ā°F to 110Ā°F and remains serviceable from -60Ā°F to 225Ā°F after curing.
Common Questions
It is designed to seal seams, panel joints, transitions, penetrations, and assembly joints in waterproof wet-area installations.
No. The polyurethane formula adheres to HYDRO-BLOK panels and many common construction materials without requiring a primer.
Yes. Its non-sag consistency allows application on both vertical and horizontal surfaces.
The sealant provides 250% elongation at break, allowing it to accommodate normal joint movement while maintaining a waterproof seal.
Yes. It complies with ASTM C920 Type S, Grade NS, Class 25, Use NT, M, and A.
It can be applied in temperatures ranging from 35Ā°F to 110Ā°F.
Once cured, the sealant performs in temperatures from -60Ā°F to 225Ā°F.
Yes. After curing, the sealant is paintable and is formulated to resist yellowing.
