Roof flashing SpiroFlex SpiroFlex 100 adjustable 25–45° with collar (Ø100 mm)

SpiroFlex 100 roof flashing is an adjustable roof penetration with a collar, designed for round ducts and pipes with a 100 mm diameter. The unit accommodates roof slopes by offering an adjustable angle range from 25° to 45°, enabling a precise fit on pitched roofs while maintaining a weatherproof seal. Intended for ventilation, exhaust and HVAC duct installations, this flashing provides a stable, sealed passage through roofing materials and is suitable for both new installations and retrofits where a round duct must pass the roof surface.

Advantages

The SpiroFlex 100 flashing provides a flexible angle adjustment mechanism that ensures correct alignment with sloped roof planes and reduces the need for angled elbows inside the duct run. Its integrated collar simplifies connection to Ø100 mm ducts and pipes, ensuring a consistent sealing surface. The product is designed to create a reliable external seal against rain and snow and to limit air leakage around the penetration. Its compact form factor and adjustability make it suitable for various roof coverings and installation contexts.

Suitable for

• Ventilation systems requiring a 100 mm round roof penetration
• Exhaust duct outlets from kitchen hoods or bathroom fans
• HVAC ductwork passing through pitched roofs with slopes between 25° and 45°
• Retrofit projects where an existing duct must be extended through the roof

Key specifications

• Designed for round ducts and pipes with nominal diameter 100 mm
• Adjustable roof penetration angle range: 25°–45°
• Integrated collar for secure duct connection
• Intended for external roof sealing on pitched roofs

How to use

Mark and cut a circular opening in the roof material sized for a 100 mm duct, following local building and safety regulations. Position the SpiroFlex 100 flashing so the adjustable base matches the roof pitch; set the angle within the 25°–45° range and ensure the flashing sits flat against the roofing surface. Fasten the flashing according to the roof covering type, apply compatible roofing sealant as required for a weatherproof joint, and insert the Ø100 mm duct into the integrated collar. Secure the duct connection with appropriate clamps or seal methods and verify the external seal for water tightness.

Usage recommendations

Use compatible roofing sealants and fastening methods recommended for the roof material to maintain a durable weatherproof seal. Confirm that roof load, local wind and snow conditions, and applicable building codes are addressed during installation. For long duct runs or complex roof geometry, plan duct alignment to minimize sharp bends immediately above the flashing.