White Vapor Barrier Tape – 4" x 60 Yd, 9 Mil Polyethylene - USA Made

Strong, Watertight Sealing for Vapor Barrier Seaming, Splicing & Patching

Seal your vapor barrier installation with confidence using our heavy-duty White Vapor Barrier Tape. Engineered with a durable polyethylene backing and coated with a tacky synthetic rubber adhesive, this USA Made tape delivers long-lasting bonds for seaming, splicing, and patching vapor barrier films.

With excellent tear resistance, high tensile strength, and reliable adhesion across a wide range of temperatures, this white seaming tape ensures a watertight seal in crawl spaces, basements, and construction sites. Perfect for connecting 6, 10, 15, and 20 mil vapor barriers (sold separately), it’s the professional choice for moisture protection.

Shop all Sandbaggy Vapor Barriers - 6 Mil, 10 Mil, and 15 Mil.

Specs

• Roll Size: 4" x 60 yards
• Thickness: 9 mil
• Color: White
• Roll Weight: 3 lbs
• Backing: Heavy-duty polyethylene
• Adhesive: Synthetic rubber

Technical Data

• Total Thickness: 9 Mil (.229 MM)
• Permeance: 0.11 PERMS
• Elongation: 85%
• Adhesion: 85 oz / inch (PSTC 101)
• Tensile Strength: 30 lbs / inch (ASTM D-1000)

Features

• Proudly Made in the USA: Manufactured domestically for higher quality control, reliable performance, and greater consistency.
• Watertight Seal: Creates a strong, moisture-resistant bond between vapor barriers.
• Heavy-Duty & Tear Resistant: Polyethylene backing with high tensile durability that holds up under stress without ripping or splitting.
• High-Tack Adhesive: Bonds securely to most surfaces for long-lasting hold.
• Temperature Versatility: Performs reliably in a wide range of conditions.
• Multi-Purpose Use: Ideal for splicing, seaming, and patching barrier films.
• Versatile Applications: Perfect for crawl spaces, basements, under slabs, greenhouses, and other moisture-prone areas.

FAQs

What is vapor barrier tape used for?

It’s designed to connect and seal vapor barrier sheets, ensuring a watertight and airtight installation.

Can this tape be used on all vapor barrier thicknesses?

Yes, it works with 6, 10, 15, and 20 mil vapor barriers (sold separately).

Is the adhesive strong enough for crawl spaces or basements?

Absolutely — the synthetic rubber adhesive bonds well even in demanding environments. 

Do I need to prep the surface before applying the tape?

Yes. For best adhesion, make sure the surface is free of dust, oil, and contaminants.

What color is the tape?

The tape is white for a clean, professional finish.

What other names might this product go by?

• vapor barrier seam tape
• crawl space vapor barrier tape