Drop Down Doors


The GL251 Lockable Drop-Down Loft Access Door is ideally suited for properties with shared accommodation to provide protection from unauthorized access to the loft space.

  • Description & Key Features

    Product Description

    The GL251 lockable drop down loft door is an innovative solution to the need for energy efficient loft space access for use in shared accommodation, offering a cost effective alternative to traditional means of access. The unobtrusive design coupled with sleek, contemporary styling makes the door an ideal match for modern decors. It is supplied with a key lock for additional security.
    The revolutionary design of the multi-point catch mechanism means that the GL251 door can maintain a more effective draught seal around the entire accessible opening, helping to meet the air leakage requirements of Part L of the Building Regulations and preventing the problem of moist warm air entering the roof space causing condensation and heat loss issues.

    Available with a range of insulation options to suit all requirements of modern construction levels; from an entry level insulation, to the Robust Construction Detail U-Value of 0.35 W/m²K and even down to a U-Value of 0.15 W/m²K to help meet the higher levels of the Code for Sustainable Homes.

    Key Features

    • Low profile design with sleek, contemporary styling
    • The door and frame are fully draught sealed
    • Seals are supported by multiple perimeter catches
    • Lockable sliding door mechanism is operated from a single point
    • Innovative hinge detail is hidden when the door is locked
    • The design allows for the door to be fully removed
    • All hinge, catch and fixing geometry outside of the door seals
    • Hinge pivot positioned to provide largest accessible opening
    • Frame screws up into ceiling timbers for simpler installation
    • Insulated area on the back of the door is fully maximised
  • Technical

    Fitting Requirements

    Prepare a 562 x 726mm opening in the ceiling, ensuring there is at least 100mm between the edge of the opening and any wall or obstruction.


    BRE Report 283-506 - Airtightness Test on Manthorpe GL250 Loft Access Hatch.pdf

    Regulations & Standards

    BS 5250: Control of condensation in buildings.

    BS 9250: Design of the airtightness of ceilings in pitched roofs.

    Approved Document L1 & L2: Conservation of fuel and power.

    DEFRA Robust Construction Details

    NHBC Technical Guidance 7.2: Pitched Roofs.

    BRE Digest Report 262: Thermal Insulation: Avoiding Risks.

    BRE Digest Report 443: Conventions for U-Value calculations.

  • Specifications

    Size Information

    Door Sizes:

    Overall Size: 856mm x 686mm

    Fitting Size: 562mm x 726mm

    Accessible Opening: 715mm x 545mm

    Insulation Options:

    50mm Expanded Polystyrene


    Door & Frame:

    High Impact Polystyrene (HIPS)

    Insulation options:

    Expanded Polystyrene



    Quantity Information

    1 per box