Viper 2 inch x 90 ft Double Bond Butyl Tape

Viper II Double Bond Butyl Tape – 2 in x 90 ft Double-Sided Butyl Tape

Viper II Double Bond Butyl Tape is a professional-grade double-sided butyl adhesive tape built for creating strong, airtight, moisture-resistant bonds in demanding construction environments. With aggressive adhesion on both sides, it helps form a watertight seal between overlapping seams and between vapor barriers and common structural surfaces.

In simple terms: This is a double-sided “gasket-style” tape that bonds two surfaces together tightly to help stop air leaks and moisture at seams and overlaps.

---

Best For

• Contractors: Reliable double-sided bonding for vapor barrier seams, foundation transitions, and tough substrates like concrete and OSB.
• Homeowners/DIY: A cleaner alternative to messy caulks for sealing overlaps where an airtight, moisture-resistant bond matters.

Key Benefits

• Double-sided butyl adhesion: Bonds strongly to both surfaces for a long-lasting seal.
• Seals seams & transitions: Ideal for vapor barrier overlaps and transition detailing where air leakage is a concern.
• Works on common substrates: Adheres well to materials like concrete, OSB, plywood, and many common building surfaces when properly prepped.
• Fastener friendly: Designed to maintain seal integrity when penetrated by nails and fasteners (nail sealability tested).
• Wide temperature performance: Built for demanding hot/cold conditions in real jobsite environments.
• Moisture & mold resistance: Tested for mold resistance to support long-term durability in enclosed assemblies.

Typical Uses

• Vapor barrier seam sealing (overlaps and joints)
• Bonding vapor barriers to foundation walls and piers
• Crawl space and basement moisture control detailing
• Slab-on-grade transition sealing
• Gasket-style sealing at overlaps where caulk is impractical or messy

---

Specifications

Product Type	Double-sided butyl adhesive tape
Roll Size	2 in x 90 ft
Nail Sealability	Pass – AAMA 711-07 (Modified D-1970)
90° Peel Adhesion (Plywood)	7.2 lb/in (AAMA 711-07 Sec. 5.3)
90° Peel Adhesion (OSB)	5.5 lb/in (AAMA 711-07 Sec. 5.3)
90° Peel Adhesion (Facer)	6.5 lb/in (AAMA 711-07 Sec. 5.3)
Mold Growth	No Growth – ASTM G-21
Service Temperature	-40°F to 300°F

---

Installation Notes (Best Practice)

• Surface prep: For best results, apply to clean, dry surfaces free of dust and oils.
• Apply pressure: Press firmly (or use a roller) to fully activate adhesive contact.
• Plan overlaps: Keep seams flat and tight for a continuous bond and seal.
• Rough surfaces: On textured or porous materials, extra pressure improves bond strength.

Common Questions

Q: What is this tape used for?
A: It’s used to bond and seal overlaps and transitions—especially vapor barrier seams and connections to foundations or structural surfaces.

Q: Is it good for crawl spaces and basements?
A: Yes—this tape is commonly used in crawl space and basement moisture control systems where airtight, moisture-resistant seams are important.

Q: Can it replace caulk?
A: In many seam and overlap applications it acts like a clean gasket-style seal, but always follow the assembly requirements for your project.