homebuildy.com Valley flashing is designed to direct water away from the roof valleys where two slopes meet, preventing leaks by channeling water efficiently through these vulnerable junctions. Kickout flashing, installed at the junction of the roof and exterior wall, directs water away from the wall, preventing water intrusion and damage to the building's siding and foundation. Both types of flashing are essential components of a roofing system to ensure proper water drainage and protect the home from moisture-related issues.
Table of Comparison
| Feature | Valley Flashing | Kickout Flashing |
|---|---|---|
| Purpose | Directs water away from roof valleys where two roof planes meet. | Diverts water from the roof to the gutter at wall intersections. |
| Location | Installed in roof valleys between intersecting roof planes. | Placed at the juncture of roof edges and vertical walls. |
| Material | Typically metal (aluminum, galvanized steel, or copper). | Usually metal, matching gutter material for durability. |
| Function | Prevents water infiltration and leaks in roof valleys. | Prevents water damage to walls by directing water into gutters. |
| Installation Complexity | Moderate; requires precise fitting in roof valleys. | Simple; designed to fit where roof meets wall and gutter. |
| Common Issues Addressed | Leaks and water pooling in roof valleys. | Water intrusion behind gutters and wall damage. |
Understanding Valley Flashing: Definition and Purpose
Valley flashing is a metal or waterproof material installed along the intersection where two roof slopes meet, directing water away from the valley to prevent leaks and water damage. Its primary purpose is to channel rainwater and melting snow efficiently, protecting the roofing structure by maintaining proper drainage. Compared to kickout flashing, which diverts water away from the wall and foundation at roof-to-wall junctions, valley flashing specifically manages water flow within roof valleys.
What is Kickout Flashing? Key Functions Explained
Kickout flashing is a specific type of flashing designed to direct water away from the intersection where a roof meets a vertical wall, preventing water intrusion and damage. It functions by channeling rainwater safely off the roof edge and into the gutter system, avoiding leaks that can occur at vulnerable junctions. Valley flashing, in contrast, is used in roof valleys to manage water flow where two roof slopes meet, highlighting the unique role of kickout flashing in protecting wall foundations and siding.
Valley Flashing vs Kickout Flashing: Core Differences
Valley flashing directs water runoff away from roof valleys where two slopes intersect, preventing leaks and structural damage in these vulnerable channels. Kickout flashing is installed at the roof-to-wall transition to divert water away from the siding and into the gutter, protecting exterior walls from water infiltration. The core difference lies in their placement and function: valley flashing manages water flow in roof intersections, while kickout flashing safeguards the junction between roof edges and vertical walls.
Material Choices for Valley and Kickout Flashing
Valley flashing is typically made from durable metals like aluminum, galvanized steel, or copper to withstand heavy water flow and prevent leaks in roof valleys. Kickout flashing, often fabricated from the same materials, focuses on redirecting water away from vulnerable wall intersections, requiring corrosion-resistant options such as stainless steel or copper for longevity. Selecting high-quality metals for both valley and kickout flashing ensures optimal protection against moisture intrusion and extends the lifespan of roofing systems.
Installation Techniques: Valley Flashing vs Kickout Flashing
Valley flashing installation requires precise metal shaping to fit the roof's intersecting slopes, ensuring water flows smoothly into the valley without pooling. Kickout flashing installation involves securely attaching the flashing at roof-to-wall junctions, directing water away from the wall and into the gutter system, preventing water damage. Both techniques demand careful integration with roofing materials and sealants to maintain watertight protection.
Common Problems: Valley Flashing and Kickout Flashing Failures
Valley flashing failures often result from improper installation, causing water to pool and penetrate the roof structure, leading to leaks and wood rot. Kickout flashing problems typically arise when the flashing is too short or incorrectly angled, directing water onto the siding and causing moisture damage and mold growth. Both types of flashing require precise alignment and sealing to prevent water intrusion and maintain the roof's integrity.
Durability and Maintenance: Valley Flashing Compared to Kickout Flashing
Valley flashing offers enhanced durability due to its larger surface area and ability to effectively channel water away from roof intersections, reducing the risk of leaks over time. Kickout flashing, while essential for directing water away from walls and foundations, requires more frequent maintenance to prevent debris buildup and ensure proper water flow. Proper installation of valley flashing typically results in lower long-term maintenance costs compared to kickout flashing, which is more susceptible to damage from environmental exposure.
Building Code Requirements: Valley vs Kickout Flashing
Valley flashing and kickout flashing both serve critical roles in water management around roofs but are subject to distinct building code requirements. Valley flashing must comply with specific guidelines for size, overlap, and materials to ensure proper water diversion at roof intersections, minimizing leaks and structural damage. Kickout flashing is mandated by code to extend beyond the gutter line, directing water away from the wall, preventing water intrusion and protecting the building envelope from moisture-related deterioration.
When to Use Valley Flashing or Kickout Flashing
Valley flashing is essential where two roof planes meet to direct water away from the valley and prevent leaks, typically used in roof valleys and internal angles. Kickout flashing is installed at the junction of the roof and wall to divert water away from the wall and prevent water intrusion behind the siding or trim. Use valley flashing in areas with intersecting roof slopes and kickout flashing at roof-to-wall transitions to ensure effective water management and protect the building envelope.
Cost Comparison: Valley Flashing vs Kickout Flashing
Valley flashing generally costs more than kickout flashing due to its larger size and complexity, with prices ranging from $10 to $25 per linear foot compared to kickout flashing's $5 to $15 per linear foot. The installation of valley flashing requires more labor and precise fitting to manage water runoff at roof valleys, increasing overall expenses. In contrast, kickout flashing is simpler and quicker to install, resulting in lower labor costs and making it a cost-effective solution for directing water away from siding and foundations.
Valley Flashing vs Kickout Flashing Infographic
