Flexoflash FAQs

Flexoflash is usually cheaper than lead flashing by around 20% based on a per lineal meter rate. It’s important to remember that all our flashings come in a 5m roll. Lead usually comes in 3m roll.

Yes the easiest way is to lift up your existing lead and install Flexoflash directly underneath it. You can install the Flexoflash in full 5m lengths. Then dress down the existing lead over the Flexoflash as an over-flashing. You can trim the existing lead back if you want a smaller over-flashing. If you completely remove the lead you will need to chase the Flexoflash back into brickwork, or go underneath the facia.

Flexoflash can be installed in any situation where traditional lead flashings is installed: Abutments, Dutch Gables, step-flashings, chimneys, sky lights, and used as a penetration flashing. Flexoflash can be installed on all roofing material types, including but not limited to: Tile, Colorbond (metal), Polycarbonate, Copper and Zinc. Flexoflash can’t be used on a flat roof, or in the middle of a roof as a patch. The roof that Flexoflash is installed on must be at least a 5 degree pitch.

If you need to use a sealant then we recommend using Sikaflex Pro. Roofer’s silicone and glue is not recommended. Sikaflex Pro should not be used between the roof material and the Flexoflash itself though, as this will affect the adhesive performance of the butyl strip. 

Acid wash is usually diluted and doesn’t affect the Flexoflash but it is recommended to do the acid wash before installing and give the Flexoflash a good hose down with water to ensure the acid isn’t sitting on the Flexoflash.

Yes, Flexoflash is compatible with metal & polycarbonate roofing materials and can be easily stretched to provide a tight fit on corrugated profiles.

Yes, as the full adhesive backside will apply firmly to asbestos. It’s important to brush clean as much as possible to get best adhesion.

Yes, Flexoflash is fully tested to AS/NZS 2904:1995 Damp Proof Course & Flashings.

We don’t recommend painting Flexoflash because most types of paint won’t adhere well to its surface.

Yes, Flexoflash is completely non-toxic and it fully tested to AS/NZS 4020:2005: Products in contact with drinking water. Flexoflash will not change the colour or taste of water it comes in contact with.

In the same way as you would install lead flashing. Flexoflash is installed horizontally for abutments, gables and pitches roofs where there is a facia or cladding on the second storey level. If Flexoflash is to be installed on a pitched roof on a brick second storey then it must be

Flexoflash can be installed in full 5m lengths whereas Lead (20kg for external flashings) must be installed in sheets no longer than 1.5m with 150mm over-lap when joining sheets, so Flexoflash is up to 50% quicker to install than lead and no specialist tools are required.

Flexoflash only requires a 40mm over-lap to join rolls and it self-fuses forming a watertight join.

20kg lead flashing is very heavy and difficult to move around the roof but Flexoflash is very light, it’s only 4.3kg for a 280mm x 5m roll so it’s much easier to install. Flexoflash can be installed on all common roof materials (including metal roofs).

Flexoflash is available in 2 widths: 280mm and 370mm. And 3 colours: Grey, Black and Terracotta.

No, Flexoflash must always be built in, chased in or mechanically over-flashed to ensure the warranty is valid. A mechanical over-flashing such as a metal strip can be used in some instances. Please check with your local building codes. Flexoflash is not covered by the warranty if it’s just adhered to external brickwork or facia. 

Yes, Flexoflash does not react with any metal or plastic roofing material. Although Flexoflash is designed to replace lead flashing on tiled roofs, it can also be used on metal and polycarbonate, however, it must still be built-in, chased-in or over-flashed. Flexoflash cannot be installed in the middle of a metal or polycarb roof with the top edge exposed to running water. 

Flexoflash has not currently been tested to a Bushfire Attach Level (BAL). Therefore Wakaflex is recommended for fire prone areas as it has been tested to BAL29, which means is can be installed on properties in areas categorised BAL29 and below as long as the installation follows CSIRO’s recommendations, which is the correct installation with no air space behind the Wakaflex flashing.

Flexoflash is made in Denmark. It has been on the global market for over 20 years and has been available in Australia from 2024.

Flexoflash comes with a 20 year warranty as long as it’s installed according to the installation instructions. The warranty does not cover incorrect installation, accidental damage or an instance of uncontrollable natural forces. Please see our warranty online for further information.

The main body of Flexoflash is made from a synthetic rubber called Polyisobutylene. It’s a semi-solid rubber material that’s anti-aging, non-toxic and tasteless. Has good chemical stability and is resistant to heat, ozone and UV light. It’s also completely impermeable to water and air. The high molecular weight (not to be confused with mass) ensures it will not harden, crack or peel. The Polyisobutylene based synthetic rubber formulation used in the manufacture of Flexoflash has been specifically developed for its purpose as a lead-free flashing in residential construction.

Apart from the major advantages mentioned above it has the unique feature of being able to self-fuse on overlaps creating a completely waterproof seal when joining rolls end-to-end or on corner joins, such as around chimneys, dormer fronts, skylights, and roof mounted climate management equipment.

Within the Polyisobutylene there is an extruded Aluminium honeycomb mesh that is designed to expand and stretch when Flexoflash is moulded to the roof profile. Once the profile is imprinted into the aluminium mesh it stays in that position so Flexoflash replicates the roof profile exactly.

To ensure Flexoflash does not lift under high wind conditions and to make sure no water can be drawn up between Flexoflash and the roof surface, there is a fully self-adhesive butyl backing. This backing provides a long-lasting seal between the two surfaces.