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 in seconds
    • 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 and is available in 0.35 and 0.15 W/m²K options
  • 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.

    Remove the frame from the door and locate it squarely into the opening, fixing in place with the screws provided. Replace the door, swing closed and slide the catch mechanism across and turn the key to lock the door.


    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

    60mm Polyurethane (0.35)

    110mm Expanded Polystyrene (0.35)

    150mm Polyurethane (0.15)


    Door & Frame:

    High Impact Polystyrene (HIPS)

    Insulation options:

    Expanded Polystyrene and Polyurethane



    Quantity Information

    1 per box

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