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Category: Catnic Structural Performance Lintels Insulated Core Built In Damp Proof Course

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Catnic Lintels
Structural performance of Lintels

Structural Performance

Catnic’s structural data was achieved in accordance with the requirements of BS 5977: Part 2 and BS EN 845-2:2003.

Safe working loads, as defined by BS 5977: Part 2 and BS EN 845-2:2003 for cavity wall lintels refer to uniform distributed loads applied in the inner to outer leaf ratios:

1:1 For lintels supporting masonry only
3:1 For lintels normally carrying timber floors
5:1 For lintels normally carrying concrete floors

The CU lintel range refers to uniformly distributed loads in the ratio of 19:1 when non-standard or unusual loading conditions occur.

A lintel should not exceed a maximum vertical deflection of 0.003 x the effective span (effective span = distance between centre of bearings) when subjected to the safe working load (SWL).

Fire Tests

Catnic lintels have been tested in accordance with the relevant parts of BS476, Methods of Determination of the Fire Resistance of Loadbearing Elements of Construction.

Thermal Performance

Insulated Core

All Catnic cavity wall lintels contribute to the thermal integrity of the building. The core of the ‘Open Back’ style lintels is fully filled with CFC and HCFC free insulation to prevent cold voids.

Built-in Damp Proof Course

Catnic cavity wall lintels are shaped to form a built-in damp proof course which means partial fill cavity insulation can extend down to the top of the lintel. Therefore the cold voids normally associated with separate damp proof courses are avoided, without the need to install specially shaped insulation batts behind the DPC.

Full Part L Compliance

Suitability of an open back or combined box lintel to meet the bridging requirements in approved documents Part L1 and Part L2, depends on:

• The window frame position and
• The base feature design

Catnic undertook assessment of the full standard range of cavity wall perforated lintels with the window frame overlapping the cavity by 30mm (see Figures 1-4). The unique slotted base plate design on the underside of the lintels provides an effective conductivity not exceeding 30W/mK. This fully satisfies the requirements of the approved document to support Part L1 & L2 2006 edition, without compromising structural integrity. For designs incorporating a solid base plate (see Figure 4), suitable insulated lining is required.

Quality Assurance

Catnic lintels comply with the technical requirements of:

• National House-Building Council (NHBC)
• Housing Association Property Mutual (HAPM), with appropriate adjustment factors
• Zurich Municipal
• British & European Standards

Catnic lintels are designed to satisfy BS 5977: Part 2:1983 and BS EN 845-2:2003 are manufactured from pre-galvanised steel in accordance with BS EN 10327:2004 with or without applied polyester powder coated finish.

The majority of Catnic’s lintels are covered by a BSI Kitemark licence or by British Board of Agrément Certification.

Information associated with: Catnic Lintels - Structural Cavity Wall Lintels

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Catnic
Pontypandy Estate
Caerphilly
CF83 3GL

Tel : 029 2033 7900
Fax : 029 2086 7796

Catnic's Technical excellence is internationally recognised

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