Flashing Valley 400 X 1.8M

The Valley Flashing 400mm x 1.8m is a roofing component designed for use along roof valleys, where two sloping roof sections meet. This area can receive concentrated rainwater runoff, making correctly specified and installed flashing an important part of the roof’s water-management system.

With a listed 400mm width and 1.8m length, this valley flashing is a practical option for compatible new roofing installations, extensions, renovations and roof repair projects.

Valley Flashing 400mm x 1.8m

Roof valleys are formed where two pitched roof sections meet at an internal angle. Valley flashing creates a defined channel within the roofing system to help direct rainwater towards the guttering or other appropriate drainage point.

Product Details

• Product Type: Valley Flashing
• Listed Width: 400mm
• Listed Length: 1.8m
• Designed for roof valley applications
• Helps direct rainwater runoff
• Suitable for compatible pitched roofing systems
• Suitable for new installations and repairs
• Residential and selected commercial applications

The product name does not specify the material, thickness, coating, profile or exact installation system. Confirm these specifications from the physical product before installation.

What Is Valley Flashing Used For?

A roof valley receives runoff from the roof slopes on either side. During rainfall, this can create a concentrated flow of water along the valley.

Correctly installed valley flashing helps provide a suitable route for this water to travel down the roof while forming part of the overall weatherproofing detail.

It may be used for:

• New pitched roof construction
• Existing roof repairs
• Home extensions
• Renovation projects
• Replacement of damaged flashing
• Outbuildings
• Residential properties
• Selected commercial roofing projects

Key Features

• 400mm x 1.8m valley flashing
• Designed for roof valley areas
• Helps channel rainwater runoff
• Suitable for compatible roofing systems
• Practical 1.8m section
• Suitable for new construction
• Useful for roof repairs and renovations
• Residential and selected commercial use

Roofing Compatibility

The correct valley flashing arrangement depends on the roofing system, roof pitch, valley design and installation requirements.

Before purchasing, confirm compatibility with the roof covering being used. Do not assume suitability for a particular tile, roof sheet or other roofing product unless compatibility has been established.

Installation Considerations

Correct installation is essential for effective roof water management. Before installation, ensure the valley area is correctly aligned, prepared and adequately supported.

Consider:

• Roof pitch
• Valley alignment
• Roofing material and profile
• Correct water flow direction
• Required overlaps
• Suitable fixing positions
• Appropriate sealing where required
• Compatibility between materials
• Manufacturer installation requirements
• Applicable building requirements

Avoid unnecessary penetrations through areas intended to carry water. Fixing and sealing methods should be appropriate for the specific roof and flashing system.

Measuring and Quantity Calculation

Measure the full length of the roof valley before calculating the required number of sections.

Each section has a listed nominal length of 1.8m. Where multiple pieces are joined, the effective installed coverage will be less than the combined nominal lengths because suitable overlaps may be required.

Allow additional material for:

• Overlaps
• Cutting
• Roof geometry
• Installation adjustments
• Site-specific requirements

Important Product Information

Before purchasing or installing the Valley Flashing 400mm x 1.8m, confirm:

• Exact material
• Material thickness
• Finish or coating
• Actual flashing profile
• 400mm width measurement
• 1.8m nominal length
• Roofing system compatibility
• Suitable roof pitch
• Required overlaps
• Fixing method
• Sealing requirements
• Installation specifications

Always ensure the selected flashing is appropriate for the specific roofing system and installation.

Handling and Safety

Roof flashing can have sharp edges. Wear suitable gloves and other personal protective equipment when handling, cutting or installing the product.

Take appropriate precautions when working at height, including suitable access equipment and fall protection. Professional installation is recommended where the correct flashing detail or installation method is uncertain.

Availability

Available in-store and online at Build It DTM.