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6-Inch K-Style Inside Box Miter (90°)

6-Inch K-Style Inside Box Miter (90°)

Color: White, 30 Degree
Unit of measure: pcs
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Expected ship / pick-up date:
06 Oct | Typically ready in 1-2 days
We're ready to help. Call us at (610) 779-6934 and we'll happy to answer your questions.

Inside corners present unique challenges in large Gutter Systems. Our 6-Inch K-Style Inside Box Miters eliminate those concerns with a pre-formed 90° corner section that creates secure, professional connections for high-capacity applications. Designed specifically for 6-Inch K-Style Gutters, these Miters are manufactured from .019" painted aluminum and finished to match your complete Gutter System. They deliver watertight corner performance without complex fabrication work, providing enhanced leak protection through dual factory sealing surfaces for large-capacity drainage systems.

6-Inch K-Style Inside Box Miter (90°) Key Features

  • Pre-formed 90° geometry

    Factory-formed Inside Box Miter delivers precise, repeatable recessed corners for large Gutter installations

  • Enhanced leak protection

    Dual factory laps provide multiple sealing surfaces for superior watertight performance in high-capacity systems

  • Streamlined installation

    Eliminates field fabrication time; Gutter sections insert into factory laps and seal efficiently

  • Professional corner finish

    Creates clean inside corner with minimal visible seams and superior appearance for large systems

6-Inch K-Style Inside Box Miter (90°) Material & Specifications

Type: Inside Box Miter, 90°
Gutter Compatibility: 6-Inch K-Style only
Material: Aluminum, baked-on enamel finish
Gauge / Thickness: .019"
Colors: 20+ standard colors (color-matched to Gutter System)
Joint Style: Factory-formed dual laps for enhanced sealing (two seams)
Included: Miter only; fasteners and sealant sold separately
Use: Large residential and commercial inside corners at 90°
Notes: Field trim ends if needed for fit; verify front-bead profile compatibility with your Gutter stock

Installation & Maintenance Tips

This installation information is a general guide only and may not address your specific site conditions. Always follow local building codes, safety practices, and professional methods. If you are not experienced with this type of work, hire a qualified contractor.

Installation
  1. Plan and pitch: Verify Gutter pitch (about 1/4" per 10' toward the outlet). Mark with chalk line for large Gutter runs.
  2. Prep the sections: Measure and cut both Gutter sections square to the corner. Test-fit the Inside Miter to confirm bead alignment and proper seating.
  3. Apply sealant: Place continuous bead of high-quality Gutter Sealant inside both Miter laps where Gutter sections will insert.
  4. Assemble corner: Insert each Gutter section into the miter laps ensuring even overlap and proper seating. Leave small 1/8" gap at joints for sealant compression.
  5. Secure joints: Install Pop Rivets (or #8 Hex Screws) every 2–3" along both seams. Avoid over-tightening.
  6. Finish seams: Remove excess sealant and tool smooth inside fillet for watertight seal. Maintain clear water flow path for high-capacity drainage.
  7. Support installation: Place Hidden Hangers within 6" of miter on each section to maintain proper support and pitch for large Gutter Systems.
  8. Test system: Check corner alignment and level reveals. Water-test to verify leak-free joints and proper high-volume drainage flow.

Maintenance
  1. Check seams: Inspect corner joints annually and after severe weather. Reseal any cracked or separated areas promptly.
  2. Hardware inspection: Replace loose or corroded fasteners with stainless steel alternatives for continued reliability.
  3. Clear debris: Remove accumulated material at inside corner to prevent water backup and joint stress in high-capacity systems.
  4. Support check: Ensure adjacent Hangers remain secure and large Gutter sections maintain proper slope.

Compare Styles & Materials

6-Inch vs 5-Inch Inside Box Miters

  • 5-Inch System: Handles up to 1,400 sq ft per Downspout, easier installation, lower cost, standard for typical applications.
  • 6-Inch System: Handles up to 2,400 sq ft per Downspout (40% more capacity), required for large roofs, higher cost, essential for commercial buildings.
When to Choose 6-Inch Inside Box Miters
  • Large residential homes (over 1,400 sq ft per downspout)
  • Commercial buildings requiring maximum flow capacity
  • Steep roof pitches with high water volume demands
  • Existing 6-Inch K-Style Gutter systems requiring matching components
  • High-end custom homes and luxury construction projects

Best Choice: Select the 6-Inch K-Style Inside Box Miter for standard 90° inside corners in large Gutter Systems when you need maximum capacity, reliable performance, and color-matched aesthetics. Use Hand Miters for custom angles or unique architectural details; consider this pre-formed solution for efficient installation on high-capacity drainage applications.

Frequently Asked Questions

This is a general guide only and may not address your specific site conditions. If you are not experienced with this type of work, hire a qualified contractor.

Will this work with 5-Inch Gutters?

No. This model is designed exclusively for 6-Inch K-Style Gutters. Contact us for 5-Inch Inside Box Miter options if needed.

What fasteners and spacing work best?

Use Pop Rivets (or #8 x 1/2" Hex Screws) spaced 2–3" on center along both seams. Avoid over-driving fasteners to prevent distortion.

Do the Gutter sections need special cuts?

No special cuts required. Square-cut the Gutter sections. The Inside Miter provides the corner geometry and sealing surfaces for proper fit.

What type of Sealant should I use?

Apply our high-quality Ruscoe Sealant designed for painted aluminum. Use continuous beads and tool inside fillets smooth for optimal performance.

Is this only for inside corners?

Yes. This is specifically an Inside Box Miter for 90° recessed corners. For outside corners, use the corresponding Outside Box Miter designed for 6-Inch K-Style Gutters.

Submit an RFQ or Questions

Please feel free to contact us - we promise to respond to your inquiry within the next business day. For longer requests, visit our RFQ page.