Cavity Wall Steel Lintels

Description

All Keystone standard lintels satisfy the thermal performance requirements of Part L of the Building Regulations (E&W), Northern Ireland’s Part F and Scotland’s Technical Handbook, section 6. The S/K range has Ψ values ranging from 0.2 to 0.3 W/m·K, the exact figure depends upon the wall construction the lintel is built into. For more detailed information applicable to a particular wall construction, contact Keystone's technical team. The Keystone patented Thermal Break Plate reduces thermal bridging while adding extra rigidity Integral Steel Plaster Key for improved fire resistance. Profiled CFC free insulation.

Performance:

- Fire:

Keystone lintels have been subjected to a fire test (WARRES No. 101263) in accordance with BS 476-20: 1987, at Exova Warrington Fire and achieved a one hour fire performance.

- Corrosion:

Keystone’s standard range of lintels are manufactured from high quality grade pre-galvanized carbon steel with a zinc coating of 600 g/m² (both sides).

- Structural:

The Keystone lintel range has safe working loads as detailed in each applicable loading table in the Keystone Lintel Guide brochure. The structural performance figures within each table have been ascertained by testing in accordance with the requirements of standards BS EN 5977-2: 1983 and BS EN 845-2: 2003.

General information

Material

Galvanized steel

To BS EN 10346: 2009. DX51D plus Z600 or grade Z275 to BS 5977-2: 1983 (BS EN 845-2: 2003).

Stainless steel

Grade 304 2b 1.4307 to BS EN 10088-2. Other grades available on request: contact manufacturer.

Uniclass 2015

Pr_20_85_48_11 Carbon steel lintelsPrimary

CAWS

F30/755 Prefabricated steel lintels

F30/85 Prefabricated steel lintels

Specification data - Carbon steel lintels

Product Reference

Cavity Wall Steel Lintel

Type

As drawing

As schedule

Material

Galvanized steel

To BS EN 10346: 2009. DX51D plus Z600 or grade Z275 to BS 5977-2: 1983 (BS EN 845-2: 2003).

Stainless steel

Grade 304 2b 1.4307 to BS EN 10088-2. Other grades available on request: contact manufacturer.

Length

As drawing

As schedule

Product Options

Type:

All the following steel lintel ranges are suitable for a variety of cavity widths; add the following suffix to selected product code (below):

  • 50 – For cavity widths 50–65 mm.
  • 70 – For cavity widths 70–85 mm.
  • 90 – For cavity widths 90–105 mm.
  • 110 – For cavity widths 110–125 mm.
  • 130 – For cavity widths 130–145 mm.
  • 150 – For cavity widths 150–165 mm.

Manufactured in 150 mm increments; for minimum/ maximum lengths, consult manufacturer.

The following lintel ranges are available:

- 100 mm inner leaf:

  • Standard loading: S/K. Lengths 600–4800 mm .
  • Heavy duty loading: HD/K. Lengths 600–4200 mm.
  • Heavy duty loading: XHD/K. Lengths 600–2700 mm.
  • Extra heavy duty loading: CFS/K. Lengths 600–4800 mm.
  • Extra heavy duty loading: XCFS/K. Lengths 600–4800 mm.
  • Extreme duty loading: X/K. Lengths 600–6600 mm.

- 125–150 mm inner leaf:

  • Standard loading – S/K WIL. Lengths 600–4200 mm.
  • Heavy duty loading – HD/K WIL. Lengths 600–2700 mm.
  • Heavy duty loading: XHD/K WIL. Lengths 600–2100 mm.
  • Extra heavy duty loading: CFS/K WIL. Lengths 600–4800 mm.
  • Extra heavy duty loading – XCFS/K WIL. Lengths 600–3600 mm.
  • Extreme duty loading – X/K WIL. Lengths 600–6600 mm.

- 215 mm inner leaf:

  • Standard loading – S/K 215 WIL. Lengths 600–4000 mm.
  • Heavy duty loading – HD/K 215 WIL. Lengths 600–2100 mm.
  • Extreme duty loading – X/K 215 WIL. Lengths 600–6600 mm.

- 125–150 mm outer leaf:

  • Standard loading – S/K WOL. Lengths 600–3600 mm.
  • Heavy duty loading – HD/K WOL. Lengths 600–2700 mm.
  • Heavy duty loading: XHD/K WOL. Lengths 600–2100 mm.
  • Extra heavy duty loading: CFS/K WOL. Lengths 600–4800 mm.
  • Extra heavy duty loading – XCFS/K WOL. Lengths 600–3600 mm.
  • Extreme duty loading – X/K WOL. Lengths 600–6600 mm.

- 215 mm outer leaf:

  • Standard loading – S/K 215 WOL. Lengths 600–3600 mm.

For Uniformly Distributed Load (UDL) figures, height and thickness of lintel ranges, consult manufacturers literature for details.

Special lintels:

All Keystone lintel profiles can be manufactured with the following special requirements:

  • A feature plate can be supplied on all lintel profiles to suit 50–165 mm wide cavities.
  • A cant brick lintel can be supplied on all lintel profiles to suit 50–165 mm wide cavities. Specify width of cant brick when ordering; e.g. S/K-90 (CB = 65 mm).
  • All cavity lintels in the Keystone range can be stepped to suit requirements. Example specification: ST/K-90 (50 mm step).

Consult manufacturer for further details.

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

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