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Over Fascia Eaves Vent (1m) - OF1 and OF2

Efficient and durable primary roof ventilator supplied in convenient 1 metre lengths and available in black and white.

The Over Fascia Vent is used where the fascia board is fitted in the ends of the rafters, so creating a situation where ventilation can only be effected over the top of the board

  • fitted to the top of the board
  • felt is fixed to the rafters and over the top of the fascia vent.

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.

Suitable for new build and refurbishment situations.

Supplied in 1 metre lengths.

View product range & add to quote

Features & Benefits

  • Efficient, very unobtrusive and easy to fit
  • Suitable for new and existing projects
  • Supplied with guidance fixing holes for secure installation
  • 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

Applications

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.

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.

Technical Information

  • 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
  • 3.5mm – 4mm wide ventilation slots comply with BS 5250:2011

How to Order

  • Determine whether the roof design requires ventilation equivalent to a continuous 10mm opening (OF1) or 25mm opening (OF2)
  • Measure the overall length of the eaves to be ventilated and divide by 1m to determine the number of ventilator lengths required

Installation Advice

  • Over fascia ventilators fit onto the upper edge of the fascia board
  • It is important to note the height of the over fascia ventilator being used and make allowance for this when fitting the fascia board
  • If the height of the ventilator is not taken into account and the fascia board is lowered accordingly, then the tiles may 'kick up' at the eaves
  • Make sure that each ventilator is fixed securely into the top fascia aboard using screws or nails through each fixing hole provided
  • On pitched roofs it is advisable to provide a felt support above the fascia ventilator
  • to prevent the felt from sagging behind the fascia board and to maintain a clear air path
  • When ventilating flat roof abutments, some essential joinery work is essential - please contact the Timloc Technical Team for further information

Regulations and Standards

  • Satisfies all NHBC recommendations
  • Complies with all relevant Building Regulations and British Standards
  • Manufactured to BS EN ISO 9001 Quality Management System
  • Manufactured to BS EN ISO 14001 Environmental Management System

Material and Colour Choice

  • Manufactured by injection moulding in polypropylene
  • Available in black and white
  • nbs plus
  • riba

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