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Steel Lintel Installation Guide

Your Steel Lintel has arrived, and your Project is moving along Smoothly.

Ready to Install a Lintel? Our Guide provides some General Tips before you get started.

Lintel Installation Guidelines:

Verify Specification and Check for Damage:

  • Check your lintel for correct specifications and any damage upon receipt.
  • Any damage may impact performance; contact your lintel supplier for resolution.

Proper Bedding for Steel Lintels:

  • Ensure a minimum end bearing of 150mm for steel lintels, bedded on mortar, and leveled along its length and width.
  • Follow BS EN 1996-2:2006 when constructing masonry above the lintel.
  • Simultaneously raise inner and outer leaves to prevent excessive loading eccentricity, with a max height difference of 225mm.
  • Allow mortar to cure before bearing any floor or roof loads; temporary propping can be used for construction speed.

Install Damp Proof Course in Cavity Wall:

  • Install a lintel with a damp proof course (DPC) or cavity tray in a cavity wall.
  • Follow NHBC requirements to reduce the risk of future lintel failure.

Avoid Shock Loading:

  • Be cautious when placing heavy components above lintels to avoid shock loading.
  • Avoid applying point loads directly onto lintel flanges; maintain a minimum 150mm masonry height between flange and loading.
  • Ensure external lintel flange projects beyond the window/door frame, using a flexible sealing compound.

Enhance Appearance and Maintenance:

  • Enhance the appearance of exposed lintel undersides with lintel soffit cladding.
  • Do not cut or modify lintels without consulting a manufacturer engineer
  • Maintain lintel level along its length.

Lintel Position within a Cavity Wall:

  • Follow BS EN 1996-2:2006 and NHBC requirements; use a flexible damp proof course for all external wall lintels.
  • Center lintels in the cavity, with a maximum 10mm distance between lintel up-stand and masonry.
  • Ensure masonry does not overhang any flange by more than 25mm.


  • Introduce propping only after the initial masonry load on the lintel.
  • Use a horizontal timber plank along the underside of the lintel, securing suitable props at a maximum of 1200mm centres.
  • The responsibility for prop suitability lies with site management.

Instructions for your Lintel; Download Technical Installation Guides from Birtley Lintels, Stressline Lintels and Catnic Lintels.


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