Fully bonded segmental arch lintels
The inner wall can be supported with a separate box lintel or a pre-stressed concrete lintel. A contrast or same colour camber filler piece can be bonded to the fabrication. This allows the use of square window heads and curved arches together.
Semi-circular fully bonded arches
The inner wall may require support from an additional semi-circular lintel. Alternatively a cavity wall lintel can be supplied with the arch bonded in as shown.
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