The chamber is circular, and roofed partly by corbelling and partly by a large slab.
The parapet and corbelling were renewed about forty years ago.
In the passage the roof is of slabs laid right across, but the roof of the chamber is formed by corbelling.
The chambers are built of upright slabs and are roofed by corbelling.
Buildings in which this system is used are occasionally roofed with slabs, but more often corbelling is employed.
The roof is formed by corbelling the walls and finishing off with slabs laid across.
Two courses of corbelling also appeared on the two chimneys located at the back and in the center section of the building.
It is roofed by the successive overlapping or corbelling of the upper courses.