1 2

3×4" Downspout

3×4" Downspout

Color: White, 80 Degree
Unit of measure: 10-ft pcs
icon of a box with stamp
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.

When your roof needs to handle heavy rainfall or drains a large surface area, a standard downspout isn't enough. Our 3×4" Rectangular Aluminum Downspouts provide 40% more capacity than 2×3" systems, designed specifically for 6-Inch K-Style Gutters. Formed from heavy-gauge aluminum and finished with baked-on enamel in 20+ colors, these Downspouts efficiently channel large volumes of water away from your home, preventing overflow and foundation damage while matching your complete Gutter System perfectly. Available primarily in .024" gauge aluminum, and also .019" gauge aluminum (special/advance order only) for economical-focused installations.

3×4" Downspout Key Features

  • Heavy-duty capacity

    The 3×4" profile provides 40% more water flow than 2×3" systems, handling roof areas up to ~800 sq ft with one Downspout per 35-40 ft of Gutter run

  • Durable aluminum construction

    Fabricated from corrosion-resistant aluminum (.019" or .024" gauges), these Downspouts resist rust, rot, and warping while corrugations add rigidity and structural strength

  • Large rectangular profile

    The 3×4" rectangular shape maximizes water flow capacity and pairs perfectly with 6-Inch K-Style and Box Style Gutters for high-volume applications

  • Custom colors & finishes

    Available in 20+ baked-on enamel colors to match our Seamless Gutters—no need for onsite painting or touch-ups

  • Professional installation

    Heavy-duty aluminum construction connects seamlessly with A/B Elbows, Offsets, Pipe Clips, and Straps designed for larger capacity systems

  • Superior water handling

    Ideal for large roof areas, steep pitches, heavy rainfall regions, or commercial buildings requiring maximum drainage performance

  • Versatile compatibility

    Works with 6-Inch Gutter Systems and integrates with existing large-capacity downspout components for expansions

  • Environmentally friendly

    Aluminum is fully recyclable, making these downspouts a sustainable choice that supports green building practices

3×4" Downspout Material & Specifications

Profile: Rectangular, 3x4"
Material: Heavy-gauge aluminum - available in .024" (standard), or .019" (special order only)
Standard Length: 10 ft sections (cut to size onsite)
Finish: Baked-on enamel, 20+ colors
Compatibility: 6-Inch K-Style or Box Gutters; standard 3×4" Outlets
Roof Area Capacity: ~800 sq ft per Downspout
Recommended Quantity: One Downspout per 35-40 ft of Gutter run

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. Measure & cut: Determine total length from Gutter Outlet to ground plus extensions; cut sections with tin snips or fine-tooth saw; deburr cut edges.
  2. Install Outlet: Mount 3×4" Drop Outlet in Gutter; seal around edges with Gutter Sealant; ensure proper alignment with planned Downspout path.
  3. Connect Elbows: Use two-Elbow configuration—first Elbow from Outlet toward wall, second Elbow to direct flow downward; crimp upper sections to fit inside lower ones for proper water flow.
  4. Secure with straps: Install Pipe Clips or Downspout Straps every 6-8 feet using appropriate fasteners for your siding; maintain plumb alignment and allow for thermal expansion.
  5. Direct water away: Add bottom Elbow or Extension to carry water 4-6 feet from foundation; use Splash Blocks or underground drains as needed.

Maintenance
  1. Clear blockages: Check and clear debris from Downspouts during seasonal Gutter cleaning; use garden hose to flush from top down.
  2. Inspect connections: Verify Elbows and joints remain secure; retighten Straps and reseal loose connections with Gutter Sealant.
  3. Check drainage: Ensure water flows freely and Extensions remain properly positioned away from foundation; clear any settled debris from splash blocks.

Compare Styles & Materials

How to Choose: 3x4" vs 2x3" Downspouts

3×4" vs 2×3" Downspout Systems
  • 3×4" System: 40% more water capacity, ideal for 6" Gutters, large roof areas over 800 sq ft per Downspout, heavy rainfall regions, or commercial applications.
  • 2×3" System: Standard residential choice for 5" Gutters, typical home applications, cost-effective drainage, and moderate water flow requirements.

Best Choice: Use 3×4" Downspouts for homes with 6" Gutter Systems, large roof areas over 1,800 sq ft, steep roof pitches, or regions with heavy rainfall requiring maximum drainage capacity. Choose 2×3" Downspouts for standard residential applications with 5" Gutter Systems and typical water flow needs.

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.

How do I determine the right number of Downspouts for my home?

Generally, you need one Downspout for every 35-40 feet of gutter run. For 3×4 Downspouts, this handles up to 800 square feet of roof area per downspout under normal rainfall conditions.

How far should Downspouts extend from my foundation?

Downspouts should discharge water at least 4-6 feet away from your foundation using Splash Blocks or underground extensions to prevent basement flooding and foundation damage.

Can I paint Aluminum Downspouts to match my home?

Yes, but clean thoroughly and use a bonding primer designed for aluminum first. Many homeowners prefer ordering pre-finished Downspouts in custom colors for better durability and appearance.

How do I secure Downspouts to prevent wind damage?

Install Downspout Straps or Pipe Clips every 6-8 feet using appropriate fasteners for your siding type. In high-wind areas, consider additional Pipe Clips, strapping or heavier gauge materials.

What's the proper slope for horizontal Downspout runs?

Maintain at least 1/4" drop per foot on any horizontal sections to ensure proper drainage and prevent standing water that can freeze or create mosquito breeding areas.

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.