TR-07 – Window Head with Proprietary Steel Cavity-Wall Lintel

This steel cavity wall lintel detail shows a typical window-head junction within a rendered masonry cavity wall using a proprietary insulated lintel.

The drawing illustrates the inner and outer masonry leaves, partial-fill cavity insulation, clear residual cavity, insulated steel lintel, cavity tray, soffit insulation and internal plasterboard finish. It also identifies the minimum overlap between the window frame and insulated zone to help maintain thermal continuity around the opening.

A brick-faced version of this window-head lintel detail is also available. For broader structural requirements around openings, consult Approved Document A.

The accompanying notes cover:

• Proprietary insulated steel cavity-wall lintel installation.
• Suitability for the proposed span and applied loads.
• Minimum lintel end bearings.
• Mortar bedding and level installation.
• Cavity trays and stop ends.
• Weep holes above external openings.
• Insulation beneath the lintel.
• Window-frame overlap and thermal continuity.
• Junction SAP reference E2 and the calculated PSI value shown on the drawing.

The customer receives one downloadable PDF construction detail, drawn at 1:10 and formatted to fit an A3 sheet.

Lintel type, length and load capacity must be selected for the actual opening, masonry, floor and roof loads. Installation must follow the lintel manufacturer’s current technical information and the requirements of the project designer, structural engineer and Building Control.