How and where to use guide
VELUX Twin and Combination Flashings 94x160cm EBW PK10 0021B
Typical applications and roof types
These flashings are used on pitched timber-framed roofs where roof ventilation fans or vents need to be integrated without creating water ingress points. They are particularly suited to larger roof installations where standard flashing sizes prove inadequate. Common applications include loft conversions, attic ventilation systems, and condensation control in ventilated roof spaces. The twin and combination design allows multiple ventilation elements to be sealed within a single flashing unit, reducing the number of penetrations required.
- Loft conversions and attic ventilation installations
- Condensation control in ventilated roof spaces
- Integration with VELUX roof ventilation systems
- Larger roof areas requiring multiple ventilation zones
- Timber-framed pitched roofs only
Installation and on-site requirements
Flashings must be installed on timber grades F16 or higher to ensure structural integrity and proper load distribution. The 94cm width and 160cm length should be positioned to accommodate the roof pitch and ventilation layout before fixing. Ensure the epoxy resin coating remains intact during handling and installation to maintain weather protection. Secure flashings according to roof pitch requirements and local building regulations, using appropriate fixings for the timber grade specified. Coordinate positioning with roof vents or fans to ensure seamless integration and unobstructed airflow.
- Verify timber grade is F16 or higher before installation
- Handle carefully to avoid damaging the epoxy resin coating
- Position flashings to suit roof pitch and ventilation layout
- Ensure proper overlap with roof covering materials
- Secure with fixings appropriate to timber grade and pitch
Ventilation performance and condensation control
These flashings are engineered to work with VELUX roof ventilation systems, allowing controlled airflow through the roof structure whilst preventing water ingress. Proper installation ensures efficient ventilation that reduces condensation buildup in the roof void, protecting timber framing and insulation from moisture damage. The twin and combination design permits multiple ventilation pathways within a single flashing unit, improving overall system efficiency across larger roof areas.
- Integrates with VELUX ventilation fans and vents for controlled airflow
- Reduces condensation risk in ventilated roof spaces
- Protects roof structure and interior spaces from moisture damage
- Twin and combination design allows multiple ventilation zones
Durability and maintenance
The epoxy resin coating provides robust protection against weather exposure and corrosion, extending the working life of the flashing. Inspect flashings periodically for any damage to the coating or sealant, particularly after severe weather. Ensure ventilation pathways remain clear of debris and blockages to maintain airflow efficiency. The coating should not require routine maintenance beyond visual inspection and keeping ventilation openings clear.
- Epoxy resin coating resists corrosion and weather damage
- Inspect regularly for coating damage or sealant deterioration
- Keep ventilation openings clear of debris and blockages
- No routine maintenance required beyond visual checks