Corrugated Roof Flashing: Essential Guide for Installation and Maintenance

Tools Required: 

• Tin snips or metal shears 

• Measuring tape 

• Marker or chalk line 

• Safety gloves and eye protection 

Step-by-Step Cutting Guide: 

1. Measure and Mark – Accurately measure the required length and width of the flashing. 
2. Secure the Flashing – Place it on a stable surface and mark the cut lines with a marker. 
3. Cut with Precision – Use tin snips or metal shears to follow the markings, ensuring a clean and precise cut. 
4. Smooth Edges – File down any sharp or rough edges to prevent injuries and improve fitment. 

How to Install Corrugated Roof Flashing 

Proper installation of flashing is crucial to ensure a watertight seal. Follow these steps:

1. Prepare the Roof Surface

• Clean and remove debris from the roof area where the flashing will be installed. 

• Check for any existing damage that needs repair before installation. 

2. Position the Flashing

• Align the flashing with the corrugated profile to ensure a seamless fit. 

• Allow for an overlap of at least 150mm to prevent water seepage. 

3. Secure the Flashing

• Use roofing screws with rubber washers, placing them in the valleys of the corrugated sheets. 

• Avoid over-tightening, as this may cause warping or gaps. 

4. Seal the Joints

• Apply a high-quality roofing sealant along the edges and overlaps. 

• Use a weather-resistant sealant suitable for metal surfaces to enhance durability. 

Corrugated Roof Flashing Details 

Understanding the different types of flashing can help determine the best solution for your project: 

Common Types of Flashing: 

1. Endwall Flashing – Installed where the roof meets a vertical wall. 
2. Sidewall Flashing – Used at side intersections with walls. 
3. Ridge Cap Flashing – Covers the peak of the roof to prevent water entry. 
4. Valley Flashing – Channels water away from roof valleys. 
5. Barge Cap Flashing – Provides additional protection at gable ends. 

Each type of flashing plays a role in maintaining a leak-free roof, improving overall weather resistance. 

Benefits of Galvanised Corrugated Roof Flashing 

Galvanised flashing is coated with zinc to prevent rust and corrosion, making it ideal for Australian conditions. Some key benefits include: 

• Superior Durability – Resists rust and degradation over time. 

• Low Maintenance – Requires minimal upkeep compared to untreated metals. 

• Weather Resistance – Withstands heavy rain, wind, and temperature fluctuations. 

• Cost-Effective – Long lifespan reduces the need for frequent replacements. 

For coastal areas or high-humidity environments, aluminium flashing may be considered as an alternative due to its high corrosion resistance.