Installing a Cavity Wall Lintel

STEP 1: Ensure a minimum end bearing of 150mm for each end.
  1. Ensure the lintel is not damaged.
  2. Ensure a minimum end bearing of 150mm at each end.
  3. Ensure lintel is level along its length.
  4. Ensure lintel is fully bedded on brickwork and mortar.
 cavity wall installation
STEP 2: Ensure that masonary overhang does not exceed 25mm.
  1. Ensure that masonary overhang does not exceed 25mm.
  2. Ensure lintel is level along its width.
  3. In cavity walls, raise inner and outer leaves supported by lintel together.
  4. Masonary above lintels should be allowed to cure before applying floor and roof loads.
  5. Ensure all final wall dimensions are correct.
 cavity wall installation
STEP 3: You are Ready to Select a lintel Lintel Selector
DO's DONT's
  • Install a seperate DPC in severe exsposure conditions. A Catnic Cougar Open Back or Classic Combined Box lintel with an additional DPC membrane installed in accordance with normal practice provides the best possible protection.
  • Locate the window or door frame so that the drip on the front of the lintel projects forward of the drip on the front of the frame. It is good building practice to insert a flexible joint between the lintel and the top of the frame.
  • Ensure that timber floor joists and roof trusses have a full block depth between them and the lintel flange on Catnic Cougar Open Back lintels
  • When installing a lintel supporting a concrete floor, in addition to the cavity wall installation guide, please read the following for installing lintels supporting concrete floors.
  • Consider the use of soffit cladding for all coastal sites.
  • Use Damaged Lintels
  • Apply point loads without prior consultation. Where the loading or a substantial part of it is applied as concentrated loads, each concentrated load must be supported over a length of lintel of not less than 200mm. In such cases, the total loading must not produce bending moments or shear forces greater than those produced by the uniformaly distributed loads specified in the relevant data tables.
  • Allow blockwork to overhang the lintel by more than 25mm.
  • Apply concrete floor loads without ensurin that total loads are checked by a structural engineer.
  • Do not cut Lintels under any circumstances without consulting either Atspeed's or Catnic's technical department