In most cases the ground is rough, its surface being flush with that of the plaster on the walls, and concealed by the architrave fixed to it: sometimes, however, either the whole or part of the surface of the ground is exposed to view ; it is then said to be "finished," and is wrought, beaded, or otherwise ornamented.

Fig. 173 shows an example, in which the whole of the ground is visible. In Fig. 177 only part of the ground is seen, which forms the fascia of an architrave, and is embellished by mouldings attached to it.

Framed Grounds are used as margins for openings in superior work.

They form a sort of rough frame, generally concealed from view, and consisting of two upright sides or posts mortised to receive a head terminating in haunched tenons.

Backing

In order to form a firm support to the lining between the grounds, cross pieces are dovetailed in between the uprights of the adjacent frames, as shown in elevation in Fig. 169 and in plan in several figures; these are firmly attached to wood bricks, whose edges may be seen in elevation behind them (see Fig. 169).