The Midtherm Aluminium 0–30 Degree Black Twin Wall Flashing is a robust, weather-resistant roof flashing engineered for twin wall flue systems installed on flat or low-pitch roofs. Designed to seal the penetration point between the chimney system and the roofing surface, it prevents rain, snow, hail, and general moisture from entering the building envelope. Its black powder-coated aluminium construction offers long-lasting durability, corrosion protection, and a clean, uniform appearance alongside HT-S components.
This flashing accommodates roof pitches between 0–30 degrees, making it highly versatile for domestic and commercial applications. With a precise, installer-friendly form, it ensures a reliable watertight barrier while supporting system performance at temperatures up to 450°C. As part of the Midtherm HT-S range, it meets all required Class 1 Twin Wall safety standards and is backed by a comprehensive 20-year warranty when properly installed and registered. Suitable for solid fuel, oil, gas, biomass, and ventilation systems, it integrates seamlessly into modern heating and extraction setups.
Features and Benefits
- Black aluminium flashing for 0–30° roof pitches
- Provides a secure, weatherproof seal
- Corrosion-resistant, long-life construction
- Compatible with all HT-S Twin Wall components
- Simple, accurate installation design
- High-temperature performance up to 450°C
- Suitable for solid fuel, gas, oil, biomass, and ventilation systems
- Meets Class 1 Twin Wall standards
- ISO 9001 and CE certified
- Covered by a 20-year warranty





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