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Aluminum Starter Strip | Siding Starter Trim | CL Aluminum

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Every great siding job starts with a solid foundation, and CL Aluminum’s Aluminum Starter Strip is built for exactly that. Designed to anchor the first row of vinyl siding, this precision-formed aluminum strip ensures a clean, level, and secure start for your installation.

Each piece features a large hem for easy siding hook-in and reinforced ribs for added strength, preventing buckling or warping over time. Made in America and built to last, our starter strips provide unmatched durability and consistency from one box to the next.

Benefits of Starter Strip

Prevents Siding from Slipping or Shifting over Time

Helps Block Moisture from Seeping Behind the Siding

Easy Install- Pre‑Punched Slots and Reinforced Ribs

Why Contractors Choose CL Aluminum

  • Made in America at our own manufacturing facility
  • Consistent sizing for a clean, professional finish
  • Reinforced ribs and heavy-duty aluminum for strength
  • Factory-direct pricing for contractors big and small
  • Reliable service from order to delivery

Delivery & Ordering Information

  • Ships anywhere in the continental United States
  • Pricing: $187.50 per box
  • Free samples available upon request — contact us here
  • Bulk contractor pricing available for large orders

FAQs

An aluminum starter strip is a metal trim installed at the base of a siding wall. It creates a straight, secure starting line so the first course of siding locks in correctly, which keeps the rest of the siding aligned and helps prevent sagging or separation over time.

This product is a 2-1/2″ aluminum starter strip, sold by the box. Each box contains 50 pieces, making it suited for contractors and larger projects rather than one-off repairs.

It is sold by the box only, not by individual pieces.

The starter strip is made from rust‑resistant aluminum. Aluminum doesn’t rust like steel does, which makes it a strong choice for long‑term exterior use in varying weather conditions.

  • Buy by the box, or
  • Buy by the pallet (50 boxes) with free shipping, or
  • Choose “Buy 3 Pallets (Discounted Pricing) – FREE Shipping” for the best price per box plus free freight.


Yes. We offer free samples. You can request one by Contacting Us so we can ship a sample starter strip to you.

Hear From Our Customers

    • Matt and Chris at CL Aluminum are great to work with. As a shed manufacturer, we order all of our metal products from them, and they consistently deliver. They’re fast, efficient, and their products are always top quality.
      Ryan Bartolotta
    • I work for a local Roofing company and have been working with Matt and the team here for several years. I have always found them to be wonderful to work with, excellent pricing and customer service, and quick to jump in when you need a hand. Give them a call, you will be well served!
      Jeremy Heitland
    • CL has been amazing for us. We buy several skids of drip edge and coil from Matt every year. Their pricing is great and service is even better! Thanks guys!
      Elmer Glick
    • Quality, custom fabrication aluminum drip edge and other products for roofers and construction professionals... quick turn-around and they will even deliver our orders... can't say enough good about the level of service you will receive from this company! Thank you!
      Amos Martin
    • Working with CL Aluminum has been an overall good experience. Their products are high quality, and their staff are friendly and helpful.
      Amber Blair

CL Aluminum is Here to Help

  • fast online ordering
  • Helpful Representatives
  • great, low prices
  • wide variety of colors
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