Home > Companies > Manthorpe Building Products Ltd > GL 250 Loft Access Doors

The GL250 range of drop down loft access doors provides an unobtrusive and cost effective alternative to traditional loft space access. The multi-point catch mechanism maintains a more effective draught seal, helping to meet the air leakage requirements of the Part L Building Regulations.

Various insulation options are available to meet the various thermal requirements of the Building Regulations.

Options

GL 250 Drop Down Loft Door Range:

  • The GL250 range of drop down loft access doors is comprised of a single frame and door combination which is available with a selection insulation variations mounted to the rear of the door to help meet various thermal requirements. The standard door and frame of the product has the following attributes:
  • Manufactured from high impact injection moulded polystyrene with expanded polyurethane seals.
  • Doors have a multi-point catch and sliding mechanism together with a hinge system, allowing the door to be hinged down or completely removed from the frame, providing unobstructed access to the loft.
  • Sliding door mechanism is operated from a single point.
  • Units are light textured, white finished, and suitable for receiving alternative paint finishes.
  • The products have a fitting size of 562 x 726 mm with a picture frame surround with an overall size of: 856 x 686 mm.
  • The GL250-03 drop down / lift out access door meet the British Standard recommendation for a leakage rate of <1 m³ at a pressure differential of 2 Pa, and the Building Regulations Part L2A ‘reasonable limit ’ for the design air permeability of buildings of 10 m³/h.m² at 50Pa.
  • Draught seals are located to seal between both the frame and the ceiling, and the door and the door frame, preventing the problem of moist, warm air entering the roof space.

- Type GL250:

  • The standard door of the range.
  • Meets the air leakage requirements of Part L of The Building Regulations.
  • Insulated with 50 mm of Expanded Polystyrene (EPS).

- Type GL250-015-PU (0.15 W/m²K door):

  • A highly insulated door designed to help achieve the low U-Values outlined in the Code for Sustainable Homes.
  • Easily meets the recommended U-values outlined in Robust Construction Details.
  • Meets the air leakage requirements of Part L of The Building Regulations.
  • Insulated with 150 mm of Polyurethane (PU) to achieve a U-Value of 0.15 W/m²K.

- Type GL250-035-PU Part L compliant door:

  • A Part L Compliant version of the GL250 door.
  • Meets the recommended U-Values outlined in Robust Construction Details.
  • Meets the air leakage requirements of Part L of The Building Regulations.
  • Insulated with 60 mm of Polyurethane (PU) to achieve a U-Value of 0.35W/m²K.

- Type GL250-035-EPS Part L compliant door:

  • A Part L Compliant version of the GL250 door.
  • Meets the recommended U-values outlined in Robust Construction Details.
  • Meets the air leakage requirements of Part L of The Building Regulations.
  • Insulated with 110 mm of Expanded Polystyrene (EPS) to achieve a U-value of 0.35W/m²K.

NBS Specification

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This product is associated with the following NBS Create clause:
45-25-28/422 Roof hatches

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying

Manufacturer

Name:

Manthorpe Building Products Ltd

Tel:

+44 (0)1773 514200

Product reference

[GL250-015-PU]
[GL250-035-EPS]
[GL250-035-PU]

Loft ladder

[Not required]
[GLL256 Two-section Loft Ladder]
[GLL257 Three-section Loft Ladder]

Manufacturer details

Manthorpe House,
Brittain Drive,
Codnor Gate Business Park,
Ripley,
Derbyshire, DE5 3ND
Tel +44 (0)1773 514200
Fax +44 (0)1773 514261
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