That where long runs are installed in more than one piece, miter cuts and lap splices are used.

That where curved bends are needed, the trim is kerfed on the back so that the cuts are invisible from the front and are close enough together to create a smooth, uniform curve without kinks.

That all trim is nailed securely and that the nails or brads are suitable to avoid splitting.

That finishing nails are set adequately, but not so deeply as to pull through the wood.

That all joints and visible seams are sealed with wood filler and that all trim is suitably primed and field painted.

DOORS

An inspection of structures should include both exterior and interior doors. The following sections provide information on some of the different types of doors used at Navy activities. Items that should be checked in an inspection of specific types of doors also are pointed out.

Exterior Doors

Exterior doors are constructed mainly of solid wood, fiber glass, sheet metal, aluminum, or structural glass. Wood doors may be of hardwood or softwood. Metal doors may be of a metal-faced frame with an insulated foam core.

Hinged doors are used for most personnel entrances. They may be single-leaf or double-leaf. Two or more pairs of double-leaf doors maybe used for main entrances. Hinged doors may be of solid wood, metal-faced, filled-panel, or rolled-metal construction. They vary in style from simple stock patterns to highly ornamental designs in bronze, aluminum, Monel Metal, or stainless steel. Hinged doors may have exposed or concealed hinges mounted on the jamb or top and bottom set in the head and threshold. Most screen doors are the hinged type.

You must be sure that hinged doors are of the material, grade, size, type, and design specified and conform to the specifications. Usually, doors will have been factory-inspected. You must determine that they are accurately fitted to the frames with minimum clearance at head, jambs, and sill; that they are weather-stripped, glazed, and fitted with hardware, as specified; and that they are painted, varnished, or otherwise finished as required.

Large openings may be closed by horizontal sliding or rolling doors, usually suspended by hangers from rollers that travel on horizontal or slightly inclined tracks and guided by troughs, grooves, or similar devices at the bottom. These doors vary from simple barn doors to the massive, steel-framed doors used for airplane hangars. Doors of this type of large size usually run on wheels mounted in the bottom chord and travel on rails set at grade.

When horizontal sliding or rolling doors are inspected, you must be sure that the doors are plane and free from wind, and that the doors are mounted so that adequate operating clearance is obtained, but that suitable weathertight closure is also obtained when they are closed. You must also make certain that tracks, rollers, roller suspensions, and operators are accurately aligned and adjusted for smooth operation.

Large shop and storehouse openings are frequently closed by steel rolling doors. These doors consist of a large number of interlocking horizontal slats that can be rolled up on a drum mounted above the head of the door opening. The slats are held loosely in channel guides at the jambs. The doors are counterbalanced by a spring tension device for ease of movement and may be operated either by motor or by hand.

In an inspection of steel rolling doors, you must ensure the following:

That the slats are true and undamaged and interlock with adjacent slats, as intended, and that the slat assembly is mounted truly on the roller or drum and is correctly fastened so that the slats roll up smoothly and evenly, maintaining their horizontal position.

That slat ends are provided with guide castings, as specified or approved, and that these guide castings fit accurately into the side guides with sufficient depth of bearing to assure against their pulling out and with sufficient clearance to assure easy operation.

That the spring counterbalance or other balancing device is tensioned for the required ratio of the total load and maintains satisfactory tension throughout the operating range.

That operating machinery is suitably aligned and adjusted, and that all accessories specified are provided and installed.