Steel Inline Sliding Doors


These are typical sliding doors sitting directly on the rollers within single, double or triple tracks.  Available in a range of multiple sliding configurations and benefiting from having slim sightlines, steel inline sliding doors are flexible, versatile and ideal for both small and large openings.

Design and Aesthetic


  • Thermally broken profiles as standard 
  • A basic depth for thermally broken steel casement doors is between 50-90mm.
  • Slim sightlines

Materials and Surface Finishes


  • Strip galvanised steel (Allowing full range of standard powder coated RAL colour options)
  • Corten steel
  • Stainless steel
  • Marine grade powder coated for for use in marine and coastal environments

Size Limitations


  • Standard leaf sizes for steel casment door are up to 1.4 metres in width and 2.8 metres in height.
  • A steel top-hung window sash may weigh up to 150kg. 

Opening Styles


  • Double track: Enabling 2 or 4 panel sliding door options
  • Triple track: Enabling 3 panel sliding door option

Safety & Security Options


  • Steel casement doors come usually with multi-point locking systems as standard.
  • Burglar resistance classes of RC2, RC3 or PAS24 are available as security options,

Glass Options


  • Double glass option for a standard size casemnt door: 6-16-6, toughened glass, 20mm argon filled cavity, Ug-value of 1.0 W/m2K, low-e coating, warm edge spacers, light transmission over 70%) 
  • Triple glass option to achieve better thermal performance.
  • One pane of glass unit can be built with laminated glass for additional security or safety for preventing fall through, overhead glazing and full height glazing.

Thermal Performance


  • Thermal performance of a steel casement door depends on its frame and glass combinations.
  • A typical steel pivot window can achieve a U-value less than 1.4 W/m2K with a double glass (Ug=1.0 W/m2K).
  • For better U-values, triple glass must be choosen.

Weather-tightness Performance


A typical outward opening steel casement door should meet the following minimum weather-tightness performance values:

  • Air tightness: Class 4 (600 Pa)
  • Water tightness Class 9A (900 Pa)
  • Wind load resistance: Class C4 (1600 Pa)

Regulations and Standards


Any steel door to be installed in residential properties is subject to building regulations and certain standards:

  • Doors to be installed on the ground floor of new residential buildings must have PAS24 securilty level. (Part Q, Read More >> )
  • Doors to be installed on residential properties must comply with Approved Document L in terms of thermal performance ( Read More >> )

Buyer’s Guide to Steel Sliding Doors


2-Panel steel sliding door