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

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Master professional outside corners for your Half Round Gutter System with our factory-built 6-Inch 90° Outside Box Miter. This high-capacity exterior corner solution eliminates complex field fabrication while delivering superior weather protection and authentic traditional styling for large-scale applications. Crafted from .019" aluminum with baked-on enamel finish in White and Brown, these Box Miters provide precise color coordination with your complete 6-Inch Half Round Gutter System.
6-Inch Half Round Outside Box Miter (90°) Key Features
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High-capacity 90° exterior corner
Factory-built Outside Box Miter handles large system requirements with consistent, professional outside corners and authentic Half Round curved geometry
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Flawless color coordination
Available in White and Brown finishes with precise color matching to your 6-Inch Half Round Gutter System for seamless visual integration
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Enhanced exterior weather protection
Factory-built construction delivers superior durability and leak resistance for high-capacity exposed corner applications
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Authentic large-scale traditional profile
Preserves the classic curved aesthetics and European architectural character throughout your 6-Inch Half Round exterior corner installation
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6-Inch Half Round Outside Box Miter (90°) Material & Specifications
Type: Outside Box Miter, 90°
Gutter Compatibility: 6-Inch Half Round only
Material: Aluminum, baked-on enamel finish
Gauge / Thickness: .019"
Capacity: Engineered for large system applications up to 2,400 sq ft per Downspout
Colors: White and Brown (precise match with 6-Inch Half Round Gutter System)
Joint Style: Factory-built single piece construction
Included: Miter only; fasteners and sealant sold separately
Use: Traditional outside corners for large residential and commercial Half Round Gutter installations
Notes: Engineered specifically for authentic 6-Inch Half Round exterior 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 exterior corner location. Test-fit the Outside Box Miter to verify 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 exterior application.
- Apply sealant: Place continuous bead of high-quality Gutter Sealant inside the Miter where large Gutter sections will connect for weather-resistant sealing.
- Position Miter: Carefully position the Outside Box Miter at the exterior 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. Use proper spacing for 6-Inch Half Round exterior applications.
- Seal and finish: Remove excess sealant and smooth all joints for professional appearance and complete weather protection on high-capacity exposed corner.
Maintenance
- Inspect exterior sealing: Check Miter joints seasonally during routine maintenance for any signs of weather-related sealant deterioration.
- Clear corner debris: Remove leaves and material that may accumulate at outside corners to prevent water backup and stress on the large Half Round System.
- Monitor weather exposure: Ensure fasteners remain tight and replace any weather-damaged hardware with aluminum alternatives for continued large-system reliability.
- Check profile integrity: Verify the Miter maintains proper positioning and preserves the authentic curved profile of your 6-Inch Half Round Gutter System.

Compare Styles & Materials
When to Choose 6-Inch Half Round Outside Box Miters
- Large traditional and historic restoration projects requiring authentic exterior styling
- Outside corners on commercial or large residential Half Round Gutter installations
- High-capacity exterior applications where color matching and weather resistance are priorities
- Large-scale installations requiring dependable corner sealing with minimal field fabrication
5-Inch vs 6-Inch Half Round Outside 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 Outside Box Miters for large traditional outside corners when you need high-capacity performance, dependable weather resistance, and precise 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 K-Style Gutters?
No. This Outside Box Miter is sized specifically for 6-Inch Half Round Gutters only. Contact us for 5-Inch Half Round Outside Box Miter options if needed.
When do I need 6-Inch instead of 5-Inch Half Round Outside Box Miters?
Choose 6-Inch Outside Box Miters when your roof area exceeds 1,400 sq ft per Downspout, for large traditional buildings with exterior corners, or when you have existing 6-Inch Half Round Gutter Systems requiring matching components.
How does this handle large system exterior demands better than smaller miters?
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 exterior color requirements.
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 exterior color requirements.
What's the best sealant for large exterior 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.