Rainbuster 420- Nail on Flashing Membrane｜ Other Products

RainBuster 420 Nail-On Flashing 9" x 75' (25 mil) is a premium waterproof flashing membrane engineered for fast installation and long-term protection.
Featuring a rugged 3-layer construction with a self-sealing rubberized asphalt core, it delivers superior moisture protection for windows, doors, and wall systems in residential and commercial construction.

✔ Key Features

Nail-on installation – no peel & stick backing required
Self-sealing membrane seals around nails and fasteners
Heavy-duty 3-layer design resists job site damage
UV resistant up to 120 days
Performs in all weather conditions
Withstands high winds and structural movement
Ideal for window, door, and wall flashing

Product Specifications

Product Name
RainBuster 420 Nail-On Flashing

Thickness
25 mil

Width
9 inches

Length
75 feet

Material
Rubberized asphalt core with polyethylene & polyester films

Tensile Strength
580 psi

Elongation
130%+

Service Temperature
Up to 180°F

UV Exposure
Up to 120 days

Applications

Window and door flashing systems
Sheeted and open wall construction
Residential and commercial waterproofing
Flashing for rough openings and structural joints

⚙ Installation Guidelines

Install with white (printed) side facing outward
Secure using nails or mechanical fasteners
Compatible with most construction substrates
Follow AAMA, ASTM, and local building codes

Performance & Durability

Self-seals around fasteners to prevent water intrusion
Maintains performance under high heat (up to 180°F)
Flexible and durable in changing conditions
Resistant to tearing and punctures

⚠ Limitations

Not recommended behind metal siding or roofing systems
Must be covered after 120 days of UV exposure

Warranty

Limited Lifetime Product Warranty (100 years)
30-Year System Warranty when used with RainBuster 450 Sealant

Why Choose RainBuster 420 Flashing?
Unlike traditional peel-and-stick flashing tapes, RainBuster 420 offers faster installation with nail-on application while maintaining superior waterproofing performance. Its advanced membrane technology provides long-term durability, making it a trusted choice for contractors, builders, and construction professionals.

Frequently Asked Questions
Is this better than peel-and-stick flashing?
Yes, it installs faster and still provides self-sealing waterproof protection around fasteners.
Can it be used in cold or wet weather?
Yes, it is designed for installation in all weather conditions.
Does it seal around nails?
Yes, the rubberized asphalt core self-seals around fasteners to prevent leaks.
How long can it be exposed to sunlight?
Up to 120 days before it must be covered.
What sealant should be used with this?
RainBuster 450 Window & Door Sealant is recommended for full system performance.
Brand:RainbusterSKU:TOP4202536Tags:Free Shipping, window-flashingRoll Size:9" x 75' | 120 rolls, 12" x 75' | 90 rolls, 18" x 75' | 60 rolls, 36" x 75' | 30 rolls