6-Inch Half Round Inside Box Miter (90°)
6-Inch Half Round Inside Box Miter (90°)

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Deliver professional inside corners for your Half Round Gutter System with our factory-engineered 6-Inch 90° Inside Box Miter. This high-capacity corner solution eliminates field fabrication work while ensuring superior sealing performance and authentic traditional styling for large-scale applications. Manufactured from .019" aluminum with baked-on enamel finish in White and Brown, these Box Miters provide exact color coordination with your complete 6-Inch Half Round Gutter System for seamless architectural integration on demanding installations.
6-Inch Half Round Inside Box Miter (90°) Key Features
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High-capacity 90° inside corner
Factory-engineered Inside Box Miter handles large system requirements with consistent, professional corners and authentic Half Round geometry
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Exact color matching
Available in White and Brown finishes with precise color coordination to your 6-Inch Half Round Gutter System for seamless appearance
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Superior large-system sealing
Factory-engineered construction provides enhanced leak protection for high-capacity applications compared to field-fabricated solutions
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Authentic large-scale styling
Maintains the traditional curved profile and European architectural integrity throughout your 6-Inch Half Round corner installation
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6-Inch Half Round Inside Box Miter (90°) Material & Specifications
Type: Inside Box Miter, 90°
Gutter Compatibility: 6-Inch Half Round only
Material: Aluminum, baked-on enamel finish
Gauge / Thickness: .019"
Capacity: Designed for large system applications up to 2,400 sq ft per Downspout
Colors: White and Brown (exact match with 6-Inch Half Round Gutter system)
Joint Style: Factory-engineered single piece construction
Included: Miter only; fasteners and sealant sold separately
Use: Traditional inside corners for large residential and commercial Half Round Gutter installations
Notes: Designed specifically for authentic 6-Inch Half Round profile compatibility
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
- Measure and cut: Cut both 6-Inch Half Round Gutter sections square at the corner location. Test-fit the Inside Box Miter to ensure proper large-system curved profile alignment.
- Clean surfaces: Remove any debris or oxidation from large Gutter ends and Miter contact areas for optimal sealant adhesion on high-capacity system.
- Apply sealant: Place continuous bead of high-quality Gutter Sealant inside the Miter where large Gutter sections will connect for superior sealing.
- Position Miter: Carefully position the Inside Box Miter at the corner, ensuring both 6-Inch Gutter sections fit properly into the curved profile.
- Secure connection: Install Pop Rivets or appropriate fasteners to secure the Miter to both large Gutter sections. Follow spacing recommendations for 6-Inch Half Round Systems.
- Seal and finish: Remove excess sealant and smooth all joints for professional appearance and complete weather sealing.
Maintenance
- Inspect large-system sealing: Check Miter joints annually during routine maintenance for any signs of sealant deterioration or separation.
- Clear debris: Remove leaves and material that may accumulate at inside corners to prevent water backup in the large Half Round System.
- Monitor fasteners: Ensure Rivets or Screws remain tight and replace any corroded fasteners with aluminum alternatives for continued large-system reliability.
- Check alignment: Verify the Miter remains properly positioned and maintains the authentic curved profile of your 6-Inch Half Round Gutter System.

Compare Styles & Materials
When to Choose 6-Inch Half Round Inside Box Miters
- Large traditional and historic restoration projects requiring authentic styling
- Inside corners on commercial or large residential Half Round Gutter installations
- High-capacity applications where color matching and professional appearance are priorities
- Large-scale installations requiring reliable corner sealing with minimal field fabrication
5-Inch vs 6-Inch Half Round Inside Box Miter Systems
- 5-Inch System: Handles up to 1,400 sq ft per Downspout, easier installation, lower cost, standard for typical traditional 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 traditional installations.
Best Choice: Use 6-Inch Half Round Inside Box Miters for large traditional inside corners when you need high-capacity performance, authentic styling, and perfect color coordination with your 6-Inch Half Round Gutter System.
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 Half Round Gutters?
No. This Inside Box Miter is sized specifically for 6-Inch Half Round Gutters only. Contact us for 5-Inch Half Round Inside Box Miter options if needed.
When do I need 6-Inch instead of 5-Inch Half Round Inside Box Miters?
Choose 6-Inch Inside Box Miters when your roof area exceeds 1,400 sq ft per Downspout, for large traditional buildings, or when you have existing 6-Inch Half Round Gutter Systems requiring matching components.
Why are Half Round Miters only available in White and Brown?
These classic colors complement the traditional architectural styles where Half Round Gutters are most appropriate, ensuring authentic period appearance while covering the most common large-scale historic building color requirements.
How does this handle large system demands better than smaller miters?
The 6-Inch Box Miter is engineered for 40% more water capacity than 5-Inch systems, with enhanced structural design to handle the increased flow volumes and larger system stresses of high-capacity traditional installations.
What's the best sealant for large Half Round Box Miter installation?
Use our Ruscoe Self-Leveling Permanant Sealant designed for painted aluminum. The curved profile requires careful sealant application to ensure complete contact around the entire perimeter.
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.