Casement Bay Window Construction

CASEMENT BAY WINDOW CONSTRUCTION. Fig. 103 shows a bay window in a stone wall, with sashes of the inward-opening casement type. The bay window is entirely within the thickness of the wall, as shown in the plan.

The wall is constructed of random-coursed, roughly squared local stone, with cut quarry stone sill and lintel. The sill is cut with a wash and with stools at either end, is tailed into the masonry at each end, and extends to within two inches of the inner face of the stone wall. The masonry jambs of the opening are straight, and the frame is secured in place by means of lugs left on the ends of both head and sill, and built into the stonework as the walls are carried up. This requires very careful calking of all crevices about the frame, so as to make a wind-proof job. The sashes are shown glazed with leaded glass.

The figured dotted lines in the elevation of the window indicate the cuts at which the vari ous detailed sections are taken, the figures on the former designating the detail with the cor responding number.

A vertical section (187) is taken through the head of the window, and shows the top rail of the transom sash beveled on the edge so as to allow for the slight throw upward when the sash, which is hinged at the bottom, is opened. The inside soffit of the window is paneled. The frame is rebated for the sash, and the outside casing is moulded as shown.

A vertical section taken through the transom bar of the window is given at 188, and shows the transom sash and bar with a rebated joint, and the sash with an undercut. The transom

bar is also rebated for the casement sash, and has an undercut on the projecting portion. A moulded member of finishing woodwork covers the transom bar on the room side.

Fig 103. Inward-Opening Casement Bay.

A vertical section (189) is taken through the sill of the window, and shows a method of con struction similar to those already illustrated. The stool is tongued into the sill, and the sill and sash are rebated. The sash has two undercuts and a let-in drip-mould, to make it weather proof. The sill has a channel to catch any water which may beat in under the sash; and this chan nel discharges the water through the reamed holes, indicated by the dotted lines, onto the sill outside the sash. A horizontal section (190) is taken through the mullion of the bay window, and shows it of light construction and rebated for both sashes. The rough mullion is covered on the room side by a moulded member, and on the outside has beaded edges and a cover-mould which miters with a portion of the outside casing.

The hinged stile of the sash is rebated and tongued, and the lock stile of the sash is rebated and grooved.

A horizontal section taken through the jamb of the window is shown at 191. The trim is moulded and hollow-backed, and has a back band and wall-mould. The jamb lining is tongued into the moulded inside casing. The wall, on the inside surface, is furred, lathed, and plastered; and grounds G are set as shown.