What is roof flashing?

What is Roof Flashing?

Roof flashing seals the joints between different roofing materials, such as cedar shakes, shingles, slate, etc. It also seals the joints between walls and edges. A qualified roofer with years of experience can place the flashing on areas prone to leaking. These include shingles that go up against the wall, open valleys, chimneys, pipe boots, and other penetrations. 

The Importance of Roof Flashing 

Roof flashing plays a critical role in keeping water out of the roof repairs structure. It focuses on three essential factors: wind pressure, gravity, and surface tension to prevent water from damaging the roof. 

A professional roofer installs flashing in different ways. For instance, the roofer installs it like shingles that involve overlapping one piece on another. Likewise, the roofer seals the flashing to ensure it functions as a continuous surface. 

No matter how the roofer installs the flashing, the primary objective is to prevent water from entering your home using surface tension. Flashing can divert water, keep debris away from infiltration points, and avoid dampness. 

You can also use flashing on surfaces prone to leakage. The purpose is to strengthen the wall cladding and make it more resistant to harsh weather conditions. Flashing also benefits gutters on your roof, preventing them from over-filling and moulds growth. 

Types of Roof Flashing 

Different types of flashing are used, depending on the project’s requirements. The type of flashing depends on various factors, such as the size, shape, style, and roof architecture. Some of the most common flashing types for roofing are:

Continuous Flashing: This type of flashing works similar to an apron and is a single, long piece of metal installed to carry the water down to the roof’s shingles. 

Counter Flashing: Counter roof flashing plays a critical role in keeping the water away from the roof. The roofer installs counter flashing opposing the base flashing. 

Base Flashing: Base flashing is installed to protect chimneys from water penetration. Chimneys require two pieces of based flashing to ensure the rainwater meets the flashing surface and carries it downward. Make sure you hire a professional roofer to install this type of flashing because an inexperienced technician will find it challenging to place it around the chimney. 

Step Flashing: It is a piece of flashing with a rectangular shape bent 90 degrees in the centre. Step flashing requires the installation of multiple layers with shingles to keep the water away from the walls. Other types of a roof flashing are:

  • Valley flashing
  • Drip edges
  • Kick-out flashing 

Final Words 

Today, companies construct flashing from rubber or metal. Metal flashing materials include copper, aluminium, stainless steel, zinc alloy, and coated metal like galvanised steel, anodised aluminium, and lead-coated copper. 

In addition, you can install flexible flashing made of different materials, such as butyl rubber, rubberized asphalt, and acrylic. Flashing in Australia is also available as roll roofing and membrane, streamlining the installation process around roof projections. 

However, the most common flashing types available in Australia are concealed and exposed. The former is used around wall penetrations, such as windows and door openings, and the latter, made of sheet metal, is used for various structures. 






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