In the example given the wood linings are secured to plugs let into a rough axed arch, shown in section, Fig. 524, and partly in elevation (Fig. 525), some of the plaster, etc., having been removed so as to expose it. A concrete lintel or wood lintel with relieving arch may be used instead of the rough axed arch to support the wall above the door.
In this illustration the joints and soffits of the opening are covered by wood linings, the description of which does not fall within the Elementary Course. When there are no linings the frame is grooved to receive the plastering of the wall, as in Figs. 500, 541.
To prevent wet from getting in under the door, the step should be well weathered and not too wide. The riser of the upper step in Fig. 524 might be flush with the face of the door frame. In many cases a weather-board, such as that shown in Fig. 552, is added.
Another plan is to form a recess about 1 1/4 inch deep in the step and floor, close to the inside of the door, to receive a door mat. Any slight amount of wet that is driven in finds itself under the mat, and is not noticed. All very exposed external doors should be protected by porches.
The joint formed by the meeting of the leaves may either be simply rebated and beaded, as shown in Fig. 523, or it may be further secured by a detached "cocked bead and fillet" planted on each side, as in Fig. 526.
Sash Doors have their upper portion glazed. The styles of the glazed portion are often made narrower than those of the panels below, and are then described as "diminished styles." In this case the joints between the ends of the lock rail and the styles are cut obliquely instead of being vertical, by which more light is obtained, and the sash portion of the door is given a lighter appearance.
Plate XII. gives a part elevation and details of a sash door with styles, diminished at X. When the glazed portion of the door is divided into smaller panes the styles are often considerably diminished so as to look like those of a sash.
In Fig. 527 the transom T is continuous from wall to wall and tenoned into the side uprights, which rise to the ceiling and are there tenoned into the head. The mullions (M) have stub tenons fitting into mortises on the under side of the transom.
The framework of the side lights is housed into shallow grooves in the side posts or mullions.
The fanlight at the top of the door is kept in position at the sides and top by moulded fillets ff screwed to the frame, the bottom rail of the fanlight is connected with the transom by an iron tongue (Fig. 528).
Jib Doors are made in appearance exactly like a portion of the Avail of the room, the chair rail, dado, etc. (if any) being carried across the door. They were made use of for the sake of uniformity of appearance in a room, to save the expense of having a second door to match one necessarily fixed for use, but are almost obsolete.
Sliding Doors have metal wheels fixed upon either their top or bottom rails: these wheels run upon iron rails fixed above or below the door, which moves laterally.
Fig. 5301 is the section of a door suspended from hanging rollers, and Fig. 531 of a door running on bottom rollers.