Fire Rated Doors


The Square Manthorpe Drop Down One Hour Fire Rated Loft Access Door is designed to be flush fit to the ceiling; the modern design fits in with almost all house décor styles, lockable versions are available.

  • Description & Key Features

    Product Description

    Manufactured from powder-coated steel, the Manthorpe one-hour Fire Rated Loft Door is a must for situations in which safety is paramount.

    Finished with a light texture, the door can be easily cleaned with a solvent-free damp cloth, or alternatively can be painted to match the surrounding décor.

    Both rectangular and square drop-down versions are available to match the aesthetic design of the wider Manthorpe Loft Door range. The doors have been independently tested by Warrington Fire Research (Test Report No. 157180).

    Draught seals are located to all 4 sides of the door and seal to the frame complete with latch preventing the problem of moist, warm air entering the roof space.

    Key Features

    • 1 hour fire rated
    • Built in draft seals
    • Powder-coated mild steel finish
    • Square drop-down version
    • Available with square “T-keys” or cam locks
    • Mineral wool insulation offers of a U-Value of 0.35 W/m²K
  • Technical

    Fitting Requirements

    Trim out a suitable opening and fix noggins spanning between trusses to form a clear opening of 562mm x 562mm. Fit a layer of 12.5mm plasterboard 95mm up the edge of the joist. This leaves an opening of 537mm x 537mm.

    Offer up the door and frame in the open position ensuring it sits squarely and flush against the ceiling. Use 50mm long woodscrews to secure the frame through the 16 no. pre punched holes. Seal around the joint between the frame and ceiling using a fire resistant mastic.


    Manthorpe GL270F & GL280F 1Hr Fire Resistance Warrington Fire Test Report No. 157 180.pdf

    Manthorpe GL270F & GL280F BRE Air Leakage Test Report No. 233 677.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: 580mm x 580mm

    Fitting Size: 531mm x 531mm

    Accessible Opening: 515mm x 430mm


    100mm Mineral Wool (0.35)


    Door & Frame:

    Zinc Electro-Galvanised Mild Steel


    Mineral Wool



    Quantity Information

    1 per box