The Catnic CN71A External Solid Wall Steel Lintel is specifically designed for builders and contractors constructing external solid walls, offering a robust and efficient solution for creating openings. Its key win is the combination of immediate load-bearing capability for wet masonry and comprehensive corrosion protection, which streamlines construction and ensures long-term durability. A primary caveat is its specific application for standard duty external solid walls, so it may not be suitable for all structural requirements or cavity wall constructions.
Classic Box Lintel Design: Offers a stable and strong profile that resists twisting during the construction process, simplifying installation.
Duplex Corrosion Protection: Manufactured from galvanised steel and then powder coated, providing enhanced resistance against corrosion and extending product lifespan.
Built-in Plaster Key: Ensures good adhesion for plaster, contributing to a smooth and durable internal finish.
Built-in DPC (Damp Proof Course): Integrates essential damp proofing, preventing moisture penetration into the building fabric.
Integral Insulation: Provides thermal benefits, helping to reduce heat loss through the lintel.
Immediate Load Bearing: Designed to carry a full load of wet masonry as soon as it is installed, significantly speeding up construction time.
Standard Duty Performance: Capable of supporting loads up to 29kN and spanning up to 2700mm with adequate 150mm end bearings.
Outer Leaf Compatibility: Suitable for outer leaves measuring between 200mm and 215mm, accommodating common solid wall construction.
Excellent corrosion resistance due to Duplex Protection (galvanised + powder coated).
Time-saving installation as it carries wet masonry immediately.
Integrated DPC and insulation simplify construction and enhance building performance.
Robust box profile resists twisting, ensuring stability during building.
Reduces the need for separate brickwork and insulation components.
Available in a wide range of standard lengths for versatile application.
Specifically designed for external solid walls, not suitable for cavity walls.
Standard duty only, may not be adequate for very heavy structural loads.
Requires specific outer leaf thickness (200-215mm) for optimal fit.
Maximum span limited to 2700mm for its full 29kN load capacity.
Weight varies significantly by length, requiring appropriate handling and lifting equipment for longer units.
Excellent corrosion resistance due to Duplex Protection (galvanised + powder coated).
Time-saving installation as it carries wet masonry immediately.
Integrated DPC and insulation simplify construction and enhance building performance.
Robust box profile resists twisting, ensuring stability during building.
Reduces the need for separate brickwork and insulation components.
Available in a wide range of standard lengths for versatile application.
Specifically designed for external solid walls, not suitable for cavity walls.
Standard duty only, may not be adequate for very heavy structural loads.
Requires specific outer leaf thickness (200-215mm) for optimal fit.
Maximum span limited to 2700mm for its full 29kN load capacity.
Weight varies significantly by length, requiring appropriate handling and lifting equipment for longer units.
The Catnic CN71A Lintel is engineered for high performance in external solid wall applications. Its box profile design is crucial for stability, preventing twisting under load, which is a common challenge during masonry construction. The ability to carry a full load of wet masonry immediately upon installation significantly boosts site efficiency, allowing trades to progress without delays. For instance, once the lintel is in place with the minimum 150mm end bearings, bricklayers can continue laying bricks and blocks over the opening without waiting for mortar to cure. The Duplex Corrosion Protection ensures durability in various weather conditions, making it a reliable choice for external use. The built-in DPC and integral insulation contribute to the overall building envelope's integrity, managing moisture and improving thermal performance. It supports common brick and block formats, making it a versatile component for standard window and door openings in solid wall construction. The standard duty rating means it is suitable for typical residential and light commercial projects where loads do not exceed 29kN over spans up to 2700mm.
Preparation: Ensure the opening is correctly sized and the supporting masonry below is level and strong enough to bear the lintel's weight plus the imposed load.
Positioning: Place the lintel centrally over the opening, ensuring a minimum of 150mm end bearing on the supporting masonry at each end. This bearing is critical for load transfer.
Levelling: Use a spirit level to ensure the lintel is perfectly horizontal. Adjust with mortar if necessary.
Masonry Build-up: Begin laying masonry on top of the lintel immediately. The lintel is designed to carry a full load of wet masonry, eliminating the need for propping or curing time.
Check Alignment: Continuously check the alignment as masonry is built up to ensure the lintel remains straight and plumb.
Wall Type: Specifically designed for external solid wall applications.
Outer Leaf: Compatible with outer leaves measuring 200mm to 215mm.
Masonry: Suitable for use with standard brick and block formats.
Load & Span: This is a standard duty lintel, capable of carrying loads up to 29kN over spans up to 2700mm, assuming 150mm end bearings.
Pre-Installation Inspection: Before installation, visually inspect the lintel for any signs of damage to the galvanised and powder-coated finish. Any significant damage should be addressed as it could compromise corrosion protection.
Post-Installation: The Duplex Corrosion Protection provides long-term resistance. No special ongoing maintenance or treatment is typically required once installed within the wall structure. Ensure that the lintel is not exposed to harsh chemicals or abrasive cleaning agents, which could damage the protective coating.