Mastic Smooth Outside Corner Trim, White 2-1/4 in. x 10 ft. - image 1

Mastic Smooth Outside Corner Trim, White 2-1/4 in. x 10 ft.

Regular price $55.00

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Mastic Smooth Outside Corner Trim, White 2-1/4 in. x 10 ft.


This Mastic smooth outside corner trim in White measures 2-1/4 in. wide by 10 ft. long and is sold per piece. It caps and protects outside corners on vinyl siding installations, giving a clean, smooth-finished edge. Pair it with matching Mastic siding and inside corner or starter accessories.


Key Features:

  • Smooth Face Profile: Smooth-finish outside corner for a clean exterior corner line.
  • 10 ft. Length: 10 ft. length reduces joints on standard wall corners.
  • 2-1/4 in. Face: 2-1/4 in. face width for standard siding corner coverage.
  • White Finish: White color to match Mastic siding and trim products.
  • Sold Per Piece: Each unit is one 10 ft. piece; order the number of corners you need.

Specifications Table:

Specification Details
Brand Mastic
Sell unit 1 piece, 2-1/4 in. x 10 ft.
Product line Mastic siding accessories
Available colors White
Available sizes 2-1/4 in. x 10 ft.
Dimensions 2-1/4 in. x 10 ft.
Finish / texture White, smooth
Intended use Outside corner trim for vinyl siding
Assembly Nails to corner framing like standard corner post trim

Coverage & How Much You Need:

One piece trims one 10 ft. run of outside corner; measure each vertical corner and add pieces accordingly.

Fit and Compatibility:

Designed for use with Mastic vinyl siding; order siding, starter strip and other trim separately.


Frequently Asked Questions (FAQ):

Q: What is included?
A: One White outside corner trim piece, 2-1/4 in. x 10 ft.


Q: How many do I need?
A: Count each outside corner and divide its height by 10 ft.; add one piece per corner run.


Q: What finish is it?
A: White with a smooth face.


Q: Does it work with other siding brands?
A: It is made for Mastic siding systems; color and profile matching with other brands is not guaranteed.


Q: Is the material stated?
A: The sources do not state the material.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

Install outside corners first and run siding into them, leaving room for thermal movement. On two-story corners, plan butt joints so they fall symmetrically. Match the corner color to your window and door trim for a unified facade.

Follow the manufacturer's nailing pattern and do not nail tight to allow for expansion and contraction.


Order Mastic Smooth Outside Corner trim in White for crisp, clean siding corners.

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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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