Kick Out Flashing Installation Guide for Proper Roof-Wall Drainage
Kick out flashing is a critical detail in roofing and siding assemblies designed to direct water away from the wall where the roof edge meets the facade. Proper installation prevents moisture intrusion, wood rot, and mold by ensuring a continuous drainage path from the roof plane to the exterior. This guide explains what kick out flashing is, when to install it, and step-by-step methods to achieve a durable, long-lasting seal. Emphasis is placed on correct orientation, material compatibility, and inspection to optimize roof flashing performance and overall waterproofing.
What Kick-Out Flashing Is
Kick-out flashing, sometimes called kick-out flashing plate, is a small metal elbow that redirects roof runoff away from the wall and into the gutter. Located at the intersection of the roof edge and vertical siding or brick, it seals the gap and guides water to a proper drainage path. Without kick-out flashing, water can wick behind siding, causing rot, staining, and costly repairs. The flashing must be integrated with other roof flashing components, including step flashing and counterflashing, for a continuous waterproof barrier.
When to Install Kick-Out Flashing
Install kick-out flashing during new roof or siding installations, or when retrofitting areas where the roof edge overlaps a wall. It is especially important in regions with heavy rainfall, wind-driven rain, or driving snow. If existing flashing shows gaps, corrosion, or paint peeling near the roof wall intersection, add or replace kick-out flashing as part of a broader waterproofing update. Proper timing helps ensure a seamless transition from roof to wall and prevents moisture intrusion over time.
Tools and Materials for Kick-Out Flashing Installation
Having the right tools and materials is essential for a durable install. Typical items include:
- Kick-out flashing designed for the roof type and material (galvanized steel, copper, or aluminum)
- Self-sealing asphaltic or synthetic roofing cement
- Roofing nails or screws compatible with the flashing material
- Sealant compatible with siding and roofing materials
- Metal snips or shears, tin snips
- Hammer or drill, screwdriver, utility knife
- Chalk line and measuring tape
- Protective gloves and eye protection
Material compatibility matters: choose corrosion-resistant metals for coastal or humid climates, and ensure the finish matches surrounding roof and trim for a cohesive appearance. The goal is a durable, watertight transition that remains serviceable over time.
Step-By-Step Installation Process
The following steps provide a clear sequence for installing kick-out flashing in new constructions or renovations. Each step should be performed with the roof fully dry and weather conditions favorable to work at height.
Plan and Position
Identify the wall intersection and mark the location where water should be redirected. Ensure the kick-out’s bend faces away from the wall and toward the gutter. Confirm that the lower edge of the flashing will overlap the gutter liner or drip edge to promote drainage.
Prepare the Surface
Clean the area where the flashing will be installed. Remove burrs, old sealant, and rust. If the substrate is uneven, use shims or a leveling strip to create a smooth base. A clean, dry surface improves sealant adhesion and flashing longevity.
Install Primary Flashing Connections
Place the kick-out flashing so its vertical leg is flush against the wall and its horizontal leg aligns with the roof plane. If the roof uses step flashing, integrate the kick-out with adjacent flashing to maintain a continuous waterproof path. Use corrosion-resistant fasteners and secure the flashing firmly without over-tightening, which can distort the metal.
Seal and Secure
Apply sealant at all joints, including the joint between the kick-out and the wall, and the connection to the gutter or drip edge. Smooth sealant to a uniform bead and torque fasteners to recommended specifications. Ensure the sealant remains flexible to accommodate seasonal movement and temperature changes.
Inspect and Test
Inspect the installation for gaps, overlaps, and potential water traps. A quick water test, such as sprinkling water along the seam, can verify drainage direction and seal integrity. Address any leaks or misalignments immediately to prevent moisture intrusion.
Common Mistakes and How to Avoid Them
- Choosing the wrong flashing size or material for the roof type. Solution: match the flashing to the roof slope, exposure, and climate.
- Not integrating kick-out flashing with neighboring flashing components. Solution: ensure seamless transitions with step and counterflashing.
- Improper slope or orientation that directs water toward the wall. Solution: verify the bend faces the gutter and water flow is outward.
- Inadequate sealing or failed caulk. Solution: use compatible sealants and re-seal during periodic maintenance.
- Ignoring thermal expansion and movement. Solution: select flexible sealants and allow for expansion joints.
Maintenance and Inspection
Regular inspection is crucial for preserving the effectiveness of kick-out flashing. Check for corrosion, loose fasteners, cracked sealant, and any staining along the wall or gutter line. After heavy storms or freeze-thaw cycles, re-inspect and re-seal if needed. Cleaning debris from gutters and ensuring proper drainage helps maintain performance. A proactive maintenance plan reduces the risk of water damage and extends the life of the roof-wall interface.
FAQs
- What is kick-out flashing used for? It redirects roof runoff away from the wall to prevent water intrusion around the roof-wall intersection.
- Can kick-out flashing be installed on existing roofs? Yes, it can be retrofitted during renovations or repairs where the wall intersection is vulnerable to leaks.
- Which materials are best for kick-out flashing? Galvanized steel, aluminum, and copper are common; choose based on climate, aesthetics, and compatibility with existing materials.
- How do you know if kick-out flashing is working? Look for proper drainage toward the gutter and no water staining or dampness along the wall after rain.
- How often should kick-out flashing be inspected? At least once a year and after severe weather, with more frequent checks in harsh climates.