Catnic External Solid Wall Steel Lintel - CN71A

The Catnic CN71A Steel Lintel is specifically designed for external solid wall construction or narrow cavity walls, typically from 70mm width.

Yes, a key feature of the CN71A is its design to carry a full load of wet masonry as soon as it is installed, speeding up construction.

Duplex corrosion protection refers to the combination of galvanised steel and a powder-coated finish. This dual layer provides enhanced and long-lasting resistance against rust and environmental corrosion.

For optimal performance and to achieve the stated Safe Working Load (SWL), the lintel requires a minimum of 150mm bearing on sound masonry at each end.

Yes, the CN71A features integral insulation through its 'Cougar open back profile', contributing to the thermal performance of the building envelope.

The required lintel length is determined by the structural opening width plus the necessary bearing at each end (minimum 150mm per side). Always consult the manufacturer's load tables to match the lintel to the specific span and load requirements of your project.

While the lintel is designed to support wet masonry immediately, temporary propping may be recommended for very wide spans or specific site conditions to ensure maximum stability during the initial curing phase of the masonry above. Always follow specific project engineering recommendations.

Verify that the lintel has the required minimum 150mm bearing at both ends. Ensure the load applied does not exceed the Safe Working Load (SWL) for the specific span and that the load is uniformly distributed. Excessive point loading or insufficient curing time of the masonry below the bearing points can also cause issues. Consult a structural engineer if the issue persists.

Check the integrity and proper integration of the built-in DPC (damp proof course) with adjacent DPC layers in the wall. Ensure there are no 'bridges' of mortar or debris allowing water to bypass the DPC. Proper external detailing like weep holes and flashing also contribute to effective water management around openings.

Measure the structural opening precisely to ensure it matches the lintel length requirements, allowing for adequate bearing. Do not force the lintel into place; adjust the opening or confirm the correct lintel size has been specified. Minor adjustments to mortar beds might be necessary for level installation.

This could indicate an overloaded lintel, insufficient bearing, or improper masonry curing. Re-evaluate the total load on the lintel against its SWL for the span. Ensure the masonry has cured properly before full loads are applied (if temporary propping was used) and that all support is correctly placed. Seek professional structural advice.