Catnic Extra Heavy Duty Open Back Cavity Wall Lintel - CX70/100 Benefits: Easy-to-use open back profile: Allows masonry to be built up continuously on both outer and inner leaf Materials used in Lintels: The CG, CH and CX ranges are formed from galvanised steel, then powder coated Duplex corrosion protection: Ensures optimum durability and longevity Built-in DPC: Saves time in construction and means cavity is easy to clean without risk of damage to DPC Integral Plaster key: With staggered slots applied to the inner flange and ribbed underside of insulation (perforated steel baseplate on CH and CX range) Continuous insulation: Maximising thermal efficiency, minimising cold bridging Product Applications: For 70-85mm Cavity, 100-115mm Inner Leaf Features: Triangulated masonry load Supporting uniformly distributed masonry load Supporting uniformly distributed timber floor and roof loads Suitable for fair faced inner leaf masonry Supports concrete floors Attic truss loads Larger span multiple truss loads Conditions of use: Nominal 150mm end bearings Both leaves are raised together One course of block prior to installation of floor/roof Standard Lengths (mm) 900-2700 2850-3000 3300-3900 4200-4800 SWL 1:1/19:1 (kN) 60 55 50 32 Weight (kg/m) 16.4 16.4 19.9 19.9 Nominal height\'h\' (mm) 232 232 232 232 Note: Standard lengths are available in increments of 150mm at lengths up to 3000mm, 300mm at lengths from 3000mm - 4800mm (including 4575 but excluding 4500mm). The SWL (safe working load) is based on the total UDL (uniform distributed load) over maximum span using 150mm end bearings. To achieve the CH & CX loading figures indicated, lintels must be built-in as illustrated, ensuring that the blockwork infill is well-jointed during construction and compatible with the strength of thr masonry above. When using the Catnic CH and CX Open Back ranges with concrete floors, always ensure that the blockwork is built tight against the inner vertical face, and that a mortar joint is added to the top of the blockwork so that the floor units have an even spread over the inner flange of the lintel.