The Midtherm Aluminium 25–45 Degree Black Twin Wall Flashing is a durable, high-performance flashing designed for pitched roofs requiring secure weather sealing around a twin wall flue. Engineered for roof angles between 25–45 degrees, it forms a watertight barrier that prevents rain, snow, hail, and moisture from entering the roof penetration. Its black powder-coated aluminium construction offers long-term corrosion resistance and a clean, professional finish that complements modern installations.
The flashing is built to integrate seamlessly with the Midtherm HT-S Twin Wall system and supports continuous operation at temperatures up to 450°C. Suitable for domestic and commercial applications, it maintains full compliance with Class 1 Twin Wall safety standards and is backed by a 20-year warranty when correctly installed and registered. Ideal for solid fuel, oil, gas, biomass, and ventilation systems, it combines robust performance with straightforward installation.
Features and Benefits
- Black aluminium flashing for 25–45° roofs
- Provides a durable, watertight seal
- Corrosion-resistant, long-lasting construction
- High-temperature performance up to 450°C
- Compatible with all HT-S Twin Wall components
- Suitable for solid fuel, gas, oil, biomass, and ventilation systems
- Meets Class 1 Twin Wall standards
- ISO 9001 and CE certified
- 20-year warranty





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