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1 Hour Fire Rated Metal Loft Access Hatches

Insulated 1 hour fire rated metal loft access hatch and frame to provide simple, easy access through ceilings into the loft space for applications where fire protection is required

  • with Class O surface spread of flame classification
  • fire testing independently conducted by Warrington Fire Research Limited. (Exova Warringtonfire).

Featuring an integral anti-draught, vapour and condensation migration seal with a choice of insulation U value performances of 0.82 and 0.35W/m2k.

Meets the air leakage requirements of Building Regulation Approved Documents L1A & L2A ‘Conservation of fuel and power’ of <10m3/(h.m2) at a pressure differential of 50Pa.

Complies with BS5250 2011 the Code of Practice for control of condensation in buildings.

Secure twist operated catch assembly with downward opening hinge mechanism allows use with telescopic loft ladders.

0.5m loft door operating pole, (specific to 1160 and 1161 ranges only) to be ordered separately (not suitable for key lock variants).

Available in 2 sizes as either a framed system or with perforated beaded frame for installation into an aperture to achieve a concealed frame look as part of the ceiling finish.

Clean simple design that will blend well with most surrounding decors

  • can be painted if required.

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Features & Benefits

  • Provides up to 60 minutes fire protection and Class O surface spread of flame classification
  • Fully complies with NHBC standards for having a minimum access opening of 520mm
  • Purpose made product with proven performance
  • Superior to site fabricated panels
  • Excellent aesthetic appearance and factory finished
  • Maintenance free, no need to paint
  • Allows the use of a telescopic ladder if required
  • Incorporates secure twist operated catch assembly
  • Offered in picture frame and beaded frame
  • U value 0.82 W/m2k and 0.35W/m2k option

Applications

  • 1 hour fire rated loft access doors provide access through the ceiling into the ceiling void in situations where fire protection is required

Technical Information

The mineral wool insulation relies on entrapped air for its thermal properties.

Air is not a VOC (Volatile Organic Compound) therefore does not have a Global Warming Potential (GWP) or Ozone Depletion Potential (ODP).

Contains glass wool insulation with a thermal conductivity of 0.037W/mk.

A correction U value of 0.004W/m2k should be calculated to the proposed U value figures for a ceiling (U value for a new build residential ceiling not to exceed 0.16W/m2k).

The insulation materials featured in this range do not use, contain or produce Urea Formaldehyde, CFC’s or any of the soft CFC’s, ie HCFC’s and HFA’s.

Meets the air leakage requirements of Building Regulation Approved Documents L1A & L2A (20130 editions) ‘Conservation of fuel and power’ of <10m3/(h.m2) at a pressure differential of 50Pa under positive pressure test conditions.

Complies with BS5250 2011 the Code of Practice for control of condensation in buildings.

Installation Advice

  • The 1160 and 1611 loft hatches are designed to fit between 38mm thick ceiling joints spaced at 600mm centres which provide a clear joist opening width of 562mm and lined with 9.5mm plasterboard lined to give a 542mm clear opening width
  • If the joist spacing does not provide this opening width, a suitable trimmed opening must be formed
  • It is essential that trimmers are installed between the ceiling joists across the ends of the frame
  • The frame fixes with 10 screws (supplied), six into the ceiling joists at the sides of the frame, and four through the ends of the frame into the trimmers
  • A 50mm tall by 10mm thick protective plasterboard surround is required along all four sides of the trimmed opening

Quality, Regulations and Standards

  • Fire testing conducted by Warrington Fire Research Centre Limited
  • Meets requirements of Building Regulation document L1A & L2A (2013 edition)
  • Meets all relevant British Standards inc. BS5250:2011
  • Fully complies with NHBC standards for having a minimum access opening of 520mm
  • 0.25 and 0.35 U value options meet the Robust Details
  • Satisfies all NHBC requirements

Material and Colour Choice

  • Frame and door fabricated in 1mm and 1.2mm Zintec electro-galvanised mild steel
  • The door is lined with a fire resistant sub-panel to enhance fire resistance and stability
  • Polyester powder coating, lightly textured (can be painted if required)
  • Available in white only
  • nbs plus
  • riba

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