Mastic Pro-Bead J-Channel – 3/8" x 12' 6" Aluminum Siding Trim, 8 Colors

$356.40

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Mastic Pro-Bead J-Channel – 3/8" x 12' 6" Aluminum Siding Trim, 8 Colors

Mastic Pro-Bead J-Channel is a 3/8" x 12' 6" aluminum trim piece used to finish siding edges around windows, doors and corners. Each sell unit is one piece, with eight color options including White, Sandtone, Cameo, Desert Sand, Victorian Gray, Wicker, Classic Cream and Pebblestone Clay. Pair it with Mastic siding panels for coordinated edge trim.

Key Features:

  • Pro-Bead series: Part of the Mastic Pro-Bead trim line for siding installations.
  • Generous length: 12' 6" length reduces the number of joints per wall.
  • 3/8" profile: 3/8" J-channel profile accepts standard siding panel ends.
  • Eight colors: Offered in eight Mastic colors from White to Pebblestone Clay.
  • Aluminum trim: Rigid aluminum construction for exterior siding finishing.
  • Versatile use: Used around windows, doors, soffit edges and other siding terminations.

Specifications Table:

Specification Details
Brand Mastic
Sell unit 1 piece (some variants in cartons)
Product line Mastic Pro-Bead
Available colors Cameo, Desert Sand, Sandtone, Victorian Gray, White, Wicker, Classic Cream, Pebblestone Clay (8 colors)
Available sizes 3/8" x 12' 6"
Dimensions 3/8 in. profile x 12 ft. 6 in. length
Material Aluminum
Category Siding/Siding Accessories
Intended use Siding edge finishing and trim

Coverage & How Much You Need:

Each 12' 6" piece trims 12.5 linear feet of siding termination, such as one long side of a standard window or door opening.

Fit and Compatibility:

Designed for use with Mastic siding systems; select the color matching your Mastic siding or trim package. Siding panels and fasteners sold separately.

Frequently Asked Questions (FAQ):

Q: What size is this J-channel?
A: It is a 3/8" profile in 12' 6" lengths.

Q: What colors are available?
A: Eight colors: White, Sandtone, Cameo, Desert Sand, Victorian Gray, Wicker, Classic Cream and Pebblestone Clay.

Q: How much does one piece cover?
A: One piece covers 12.5 linear feet of trim run.

Q: How is it installed?
A: J-channel is nailed to the wall with siding panel ends slipped into the open channel; fasteners should not be overdriven.

Q: Is it sold individually?
A: Each sell unit is one piece; some color variants are stocked in cartons.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Match the J-channel color to your siding's trim package for a seamless look, or choose a contrasting shade to frame openings. Keep fastener slots loose enough to allow seasonal movement, and butt joints with a slight gap to avoid buckling. The 12' 6" length helps minimize lap joints on long runs.

Aluminum trim edges can be sharp—wear gloves when cutting and handling, and follow local building codes for flashing around openings.

Order Mastic Pro-Bead J-Channel in your siding color for clean, professional edge trim.

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Subject to Approval & Availability
All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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