Roof flashing is an essential component of any roofing system, ensuring that water is directed away from vulnerable areas and preventing potential damage. At TecHero Roofing, we understand the importance of correctly installed flashing and its role in maintaining the integrity of your roof.
Understanding Roof Flashing
Roof flashing is a thin layer of metal, strategically placed to divert water away from specific areas of a roof, especially around vertical structures like chimneys. Typically made from non-corrosive metals such as aluminum, lead, or steel, flashing can also be crafted from materials like plastic, rubber, or roofing felt. On occasion, for custom roofing projects, copper is the material of choice.
The Purpose of Roofing Flashing
The primary role of flashing is to protect vulnerable points on a roof from water damage. These points include areas around skylights, chimneys, and vents. Without the presence of flashing, water could easily seep off shingles and infiltrate the seams or spaces around these structures. However, with flashing in place, water is redirected back onto the shingles and then into the gutters or off the roof’s side.
A roof without adequate flashing can face severe consequences. Persistent water intrusion can lead to rotten roof boards, water damage within the home, and the need for extensive repairs. In many cases, poorly installed flashing is the main reason for roof leaks, emphasizing the importance of getting it right the first time.
Identifying the Need for Flashing
While most roofs benefit from flashing, certain architectural features make it a necessity. These include roof valleys, intersections between dormer walls and the roof, and skylights. If your roof has features that result in a high volume of rain runoff or has opposing surfaces, such as a roof meeting a chimney, it’s crucial to have those areas sealed with flashing.
Flashing Placement: Over or Under Shingles?
The placement of flashing depends on its location and purpose. In roof valleys, flashing is positioned between the intersecting roof edges, guiding water down the valley. While shingles are laid partially on top of the flashing in these areas, the flashing remains exposed to efficiently channel water.
Around structures like chimneys, multiple L-shaped metal flashing pieces are utilized. These are affixed to the chimney using mortar, with shingles laid over the horizontal section of the flashing. This combined arrangement ensures water is effectively directed away. However, on the chimney’s front side, flashing may be placed over the shingles.
For pipes and vents, a watertight seal surrounds the pipe, with metal flashing attached to the roof. Depending on the roof’s gradient, shingles might cover the flashing at the highest point, but at the lowest point, flashing typically sits atop the shingles.
Types of Roof Flashing
There are various flashing shapes, each designed for specific roof features:
- Apron or Continuous Flashing: Long metal sections, often with expansion joints.
- Valley Flashing: Positioned where two roof sections intersect.
- Base Flashing: The downslope flashing piece on features like chimneys.
- Counter Flashing: Used on the upslope and sides of structures like chimneys.
- Skylight Flashing: Specifically designed to protect skylight seams.
- Step Flashing: Metal sections at the base of an intersecting wall and roof.
- Drip Edges: Metal strips at roof edges to ensure rainwater runoff.
Trust TecHero Roofing for Flashing Installation
Working with flashing is a meticulous task. When done right, it safeguards against significant roof damage. However, any missteps can jeopardize your home or business. That’s why, for all your roofing needs in Los Angeles, including roof repair and roof replacement, you can trust TecHero Roofing, a leading roofing company in Los Angeles. With our expertise, your roof is in safe hands.
