Roof Ventilation


The Manthorpe Flash Vent is a simple one piece roll-out, easy fit sheet that provides weather-tight ventilation for abutment roof details with a continuous 5mm of airflow.

  • Description & Key Features

    Product Description

    The Manthorpe Flash Vent is a simple one piece roll-out, easy fit sheet that provides ventilation for abutment roof details, providing a weather-tight solution to the need for a continuous 5mm of airflow.

    As it is made from just one component it is economical and easy to install. The roll-out system makes fitting a breeze as it is supplied in a handy box dispenser with no need for specialist fixing tools.

    Manthorpe’s Research and Development team has addressed the need for a flexible and effective system by incorporating a series of nodules into the design on both sides of the flexible vent roll.

    This not only provides the required airflow but includes an integral fly screen and maximises support of the lead.

    The product has been independently wind tunnel tested for weather tightness and can be used over profiled tiles, non profiled tiles and slates without compromising its effectiveness.

    Two widths can also be joined together to fit any length of lap between the lead and the tiles.

    Key Features

    • 5,000mm² airflow
    • Suits all tile profiles
    • Works down to a 15° pitch (extra roll required for pitches below 20°)
    • No specialist tools required for installation
    • Integral flyscreen
  • Technical

    Fitting Requirements

    The flash vent is hung off of the top course of tiles with the aid of hanging clips and is sandwiched between the roof covering and the lead work.

    Ensure that there is at least a 10mm gap between the back of the top tile course and the wall to allow the airflow through.

    For roof pitches below 20º and in areas of high exposure, two rolls of flash vent may need to be joined together to provide a lap of sufficient length between the lead flashing and the tiles. This is achieved by pressing together the front edges of two rolls.


    G1105 Flash Vent Wind Tunnel Test Report.pdf

    Regulations & Standards

    BS 5250:2011 Control of Condensation in Building

    BS 5534:2014 Code of Practice for Slate and Tiling

    BS 490:2004 Concrete tiles & fittings for roof covering

    BRE: Digest 270

    Building Regulations 2010

    NHBC: Standards 7.2

    LSA: Lead Sheet Manual Vol 1

  • Specifications

    Size Information

    3M roll length, 235mm wide





    Quantity Information

    3m roll per box