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5-Inch K-Style Inside Box Miter (90°)

5-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 are a critical weak point in any gutter system. Our 5-Inch K‑Style Inside Box Miters solve that problem with a single pre‑formed 90° corner section that creates a tight, professional connection in minutes. Designed specifically for 5-inch K‑Style Gutters, these Miters are made from .019″ painted aluminum and finished to match your Gutter color. They ensure a watertight corner without the hassle of cutting and sealing multiple pieces, providing superior leak protection with dual factory sealing surfaces.

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

  • Factory 90° corner

    Preformed Inside Box Miter creates precise, consistent recessed corners every time

  • Faster installation

    Eliminates hand fabrication time; gutter ends slide into factory laps and seal securely

  • Superior leak protection

    Dual factory laps create multiple sealing surfaces for enhanced watertight performance

  • Clean profile

    Forms neat inside corner with minimal exposed seams and professional appearance

  • Color coordinated

    Available in 20+ finishes to match your gutter system, soffit, and fascia trim

  • 5-Inch K-Style compatible

    Engineered specifically for 5-Inch K-Style Gutters with standard front-bead profiles

  • Hanger friendly

    Works with Hidden Hangers; position hangers within 6" of corner on both sides

  • Weather resistant

    Durable aluminum with baked-on enamel finish withstands corrosion and UV exposure

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

Type: Inside Box Miter (K-Style), 90°
Gutter Compatibility: 5-Inch K-Style only
Material: .019" Aluminum, baked-on enamel finish
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: Residential and light 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 new runs.
  2. Prep the runs: Measure and cut both Gutter runs 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 ends will insert.
  4. Assemble corner: Insert each gutter end 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 x 1/2" 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.
  7. Support installation: Place Hidden Hangers within 6" of Miter on each run to maintain proper support and pitch.
  8. Test system: Check corner alignment and level reveals. Water-test to verify leak-free joints and proper drainage flow.

Maintenance
  1. Check seams: Inspect corner joints annually and after severe weather. Reseal any cracked or separated areas.
  2. Hardware inspection: Replace loose or corroded fasteners with aluminum or stainless steel alternatives.
  3. Clear debris: Remove accumulated material at inside corner to prevent water backup and joint stress.
  4. Support check: Ensure adjacent hangers remain secure and gutter maintains proper slope.

Compare Styles & Materials

Inside K-Style Box Miter vs Other Options

Inside Box Miter vs Other Options
  • Box Miter: Quicker installation, cleaner finish, dual sealing surfaces for better leak protection, consistent factory precision, reduced field work, predictable sealing performance.
  • Strip Miter: Lower material cost but more exposed joints and higher labor; potential for more leak points.
  • Hand Miter: Custom fabrication for non-standard angles; requires advanced skills and more installation time.

Best Choice: Select the 5-Inch K-Style Inside Box Miter for standard 90 degree inside corners when you need reliable performance, quick installation, and color-matched aesthetics. Use Hand Miters for custom angles or unique architectural details; consider Strip Miters for basic repair 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 6-Inch Gutters?

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

What fasteners and spacing work best?

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

Do the Gutter ends need special cuts?

No special cuts required. Square-cut the Gutter ends. The case style Inside Miter provides the corner geometry and sealing surfaces.

What type of Sealant should I use?

Apply high-quality Gutter Sealant designed for painted aluminum. Use continuous beads and tool inside fillets smooth.

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 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.