1m Over Fascia Vent

Efficient and durable primary roof ventilator supplied in convenient 1m lengths.

An over fascia vent is used when the fascia board is fitted in the ends of the rafters, creating a situation where ventilation can only be positioned over the top of the board.

OF1 provides ventilation equivalent to a continuous 10mm opening (10,000mm²) and is used to ventilate pitched roofs of 15°> and the roof void is uninhabited loft or attic space.

OF2 provides ventilation equivalent to a continuous 25mm opening (25,000mm²) and is used to ventilate pitched roofs of <15°, flat roofs or any roof where living accommodation is contained within the roof space.

OF3 is for the same use as OF2 but where a low profile is required.

Uses:

    • For roof eaves ventilation
    • For flat roof abutment ventilation
    • On roofs where the eaves incorporate a fascia board
    • On roofs which do not incorporate a soffit board, or where an unbroken soffit board is required

Product Information

Free AirflowLengthColourProduct Code
10,000mm²1mBlackOF1BL
10,000mm²1mWhiteOF1WH
25,000mm²1mBlackOF2BL
25,000mm²1mWhiteOF2WH
25,000mm²1mBlackOF3BL

  • Efficient, very unobtrusive and easy to fit
  • Superior strength construction – will carry the weight of the bottom row of tiles
  • 3.5mm – 4mm wide ventilation slots comply with BS 5250: 2011
  • Durable and totally resistant to decay
  • UV stabilised and colourfast
  • Supplied in convenient 1m lengths
  • Satisfies all NHBC requirements
  • Manufactured to BS EN ISO 9001 and BS EN ISO 14001
  • Complies with all relevant Building Regulations
  • Meets all relevant British Standards
  • Manufactured by injection moulding in polypropylene.
  • Available in black or white.
  • Use product OF1 to ventilate pitched roofs, where the pitch of the roof is 15 degrees or more, and the roof void is attic or loft space.
  • Use product OF2 to ventilate pitched roofs, where the pitch of the roof is less than 15 degrees, flat roofs or any roof where living accommodation is contained within the roof space.
  • Make sure each ventilator is fixed securely into the top of the fascia board using screws or nails through each fixing hole provided.
  • On pitched roofs it is advisable to provide a felt support above the fascia ventilator. This will prevent the felt from sagging behind the fascia board and will maintain a clear air path at the front.
  • When ventilating flat roof abutments with product OF2 some extra joinery work is essential.
  • Ventilation must be provided for the full length of the eaves and along both sides of the building to create a cross flow ventilation action.
  • Determine whether the roof design requires ventilation equivalent to a continuous 10mm opening (OF1) or 25mm opening (OF2/OF3).
  • Measure the overall length of the eaves to be ventilated and divide by 1m to determine the number of ventilators required.

Over fascia ventilator 1000mm (10mm airflow) 

G20 Carpentry/Timber Framing/First Fixing 

Clause 910^ EAVES SOFFIT VENTILATION

  • Manufacturer: Timloc Building Products, Timloc House, Ozone Park, Howden, East Yorkshire, DN14 7SD. T: 01405 765567 W: www.timloc.co.uk 
  • Product Reference: OF1 
  • Type: Over Fascia Ventilator (1000mm) 10mm Airflow 
  • Colour: (Black, White) 
  • Airway: Provide the equivalent of a continuous opening of not less than 10mm for the full length of eaves

Over fascia ventilator 1000mm (25mm airflow) 

G20 Carpentry/Timber Framing/First Fixing 

Clause 910^ EAVES SOFFIT VENTILATION 

  • Manufacturer: Timloc Building Products, Timloc House, Ozone Park, Howden, East Yorkshire, DN14 7SD. Tel: 01405 765567 Web: www.timloc.co.uk 
  • Product Reference: OF2
  • Type: Over Fascia Ventilator (1000mm) 25mm Airflow
  • Colour: (Black, White) 
  • Airway: Provide the equivalent of a continuous opening of not less than 25mm for the full length of eaves

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