Kick Out Diverter Roofing: A Practical Guide for Homeowners

The kick out diverter is a critical yet often overlooked component in roof-wall detailing. Proper installation prevents water intrusion at the intersection of a roof and wall, protects siding, and extends the life of the roof system. This article explains what a kick out diverter is, why it matters, how it works, and best practices for installation, maintenance, and cost considerations.

What Is a Kick Out Diverter

A kick out diverter is a small, angled metal piece installed at the end of a roof drip edge where the roof meets a vertical wall or siding. Its purpose is to channel water away from the wall and toward the gutter system, preventing water from seeping behind siding or flashing. Without a properly installed kick out diverter, water can wick behind the wall, causing wood rot, mold, and structural damage over time. The component is commonly used on homes with short roof overhangs, parapets, or when gutters are not directly below the roof edge.

Why It Matters in Roofing Systems

Water control at the roof-wall junction is a cornerstone of durable roofing. A properly installed kick out diverter reduces capillary action that draws moisture into siding and sheathing. It also protects flashing seals, minimizes staining on exterior finishes, and supports extended roof life. In regions with heavy rainfall or freezing conditions, kick out diverters help prevent ice damming and bulk water infiltration around openings such as windows and doors adjacent to the roof edge. For builders and homeowners, investing in a correct kick out diverter installation can avert costly repairs later.

How a Kick Out Diverter Works

The diverter is attached to the roof edge, typically under the flashing and over the drip edge, with its open end redirecting water outward and away from the wall. It creates a slope that encourages runoff to flow into the gutter system or away from the siding. Material choices include galvanized steel, aluminum, or copper, with coatings that resist corrosion. A properly sized kick out should align with the roof pitch and be compatible with the existing flashing and gutter setup. Incorrect orientation or improper fastening can create back-slope, pooling, or wind-driven water leaks.

Installation Basics and Best Practices

Correct installation of a kick out diverter involves careful steps and attention to flashing details. The following outline reflects common best practices used by professional roofers:

• Assess Roof and Wall Interface: Inspect the edge condition where the roof meets the wall to determine if an existing diverter is present and whether it needs replacement.
• Choose Appropriate Material: Use corrosion-resistant metal (galvanized steel, aluminum, or copper) sized to match the gutter flow and roof pitch.
• Position and Orientation: The diverter’s open end should direct water away from the wall; ensure it is aligned with the drip edge and underlayment where applicable.
• Secure Properly: Fasten with corrosion-resistant screws or nails, avoiding over-tightening which could deform the flashing.
• Seal Joints: Use exterior-grade sealant or flashing tape at joints to prevent water intrusion behind the diverter.
• Integrate with Roofing System: Ensure the diverter works with existing gutter systems, bulkheads, and fascia without causing water to back up under shingles or underlayment.
• Inspect After Completion: Check for gaps, misaligned edges, and proper water flow during a light rain test or controlled water spray.

Professional installation is recommended when dealing with complex roof lines, high wind exposure, or inaccessible areas. Improper installation can create more water intrusion than it prevents.

Common Problems and How to Fix Them

Even well-intentioned installations can encounter issues. Common problems include:

• Backflow Into Siding: Remedy by repositioning the kick out with the open end directed away from the wall and ensuring a clear path to the gutter.
• Corrosion or Deterioration: Replace deteriorated diverters with a corrosion-resistant material and consider coating for extended longevity.
• Improper Slope: Reinstall to achieve a slight downward slope toward the gutter or drainage path.
• Gaps at Flashing: Seal gaps with exterior-grade sealant to prevent moisture intrusion behind the diverter.
• Water Streaks on Siding: Address by confirming all flashing and drip edges are intact and that the diverter is correctly sized for the roof run.

Materials, Tools, and Cost Considerations

Materials vary by climate and roof design. Common options include:

• Galvanized steel kick out diverters for affordability and durability
• Aluminum diverters for lighter weight and corrosion resistance
• Copper diverters for longevity and aesthetic appeal on certain homes

Tools typically needed:

• Measuring tape and level
• Metal snips or shears, aviation snips
• Power drill with driver bits
• Roofing screws compatible with metal flashing
• Roofing cement or exterior sealant
• Ladder and safety gear

Typical cost ranges reflect material choice, labor, and home size. DIY installations may save on labor but carry higher risk of water intrusion if not done correctly. Professional installation costs vary by market and roof complexity, often including material and labor, and may be bundled with overall roof maintenance or replacement projects.

Maintenance and Inspection Tips

Routine checks help ensure kick out diverters function as intended. Consider these maintenance tips:

• Inspect after heavy storms or high wind events for loose fittings or misalignment.
• Verify water path from the diverter to the gutter during rainfall to confirm proper drainage.
• Clean debris from gutters and downspouts that could affect water flow near the diverter.
• Replace corroded or damaged diverters promptly to maintain a watertight roof-wall junction.

Code and Best Practices to Follow

Best practices for kick out diverters align with modern flashing and water management standards. Local building codes may specify requirements for flashing integration, material choices, and installation methods. When renovating or replacing sections of roofing, confirm that the kick out diverter complies with applicable standards and is compatible with current in-wall waterproofing details. Proper detailing is essential in coastal or heavily shaded climates where moisture management is critical.

Illustrative Scenarios and Cost-Saving Tips

Case examples highlight how kick out diverters prevent damage and save on longer-term expenses. For instance, a home with a short roof overhang and fixed siding benefited from a copper kick out diverter that redirected water into a gutter network, eliminating staining and wood rot on the wall face. Cost-saving strategies include pairing kick out installation with regular gutter cleaning, scheduling maintenance during off-peak seasons, and selecting material that matches both budget and climate demands.