On truss joints, verify that lengths of welds are proportioned as indicated so that eccentricity of the welded joint to the line of stress is avoided.

That all loose slag is removed.

That special care is taken to make sure that welds made overhead or in awkward or restricted positions are sound and full.

That the shop coat and welds are touched up as specified and that the specified number of coats of field PAINT is applied.

That the paint used is of the type, the quality, and the color specified. (For more information, consult the Steelworker, Volume 2, NAVEDTRA 12530).

Metal-framed Walls

Metal-framed walls are similar in design to wood-framed walls. They have channel-shaped studs and "C" shaped studs that are fastened to the metal channel that serves as the bottom and top plate. The tops of the door and window openings are supported by channel-shaped headers. However, lumber may be used for header material. if the plans and specifica- tions specify it. The metal "C" stud material is avail- able in various sizes. The most popular stud widths are 6 inches, 3 1/2 inches, and 2 1/2 inches, and the header and joist widths are 6 inches, 8 inches, and 10 inches. The thickness of the galvanized steel ranges from 14 gauge to 20 gauge steel. For the double-top plate, you may use 2 by material as long as the plans and specifications specify lum- ber vice metal. When inspecting these metal walls, make sure the proper self-drilling screws are used, check for tolerance and gauge of metal, and be sure the bottom plate is securely fastened to the floor. Also, ensure the knockouts are aligned properly for easier runs for the electrical and mechanical lines. There is one mistake commonly made when working with metal framing and that is cutting of the metal.

When you cut metal or scratch metal it tends to oxidize resulting in the creation of rust. How fast the oxidation occurs depends upon the climate. To prevent oxidation, coat the cut ends with a galvanize paint or a primer.

WOOD-FRAMED CONSTRUCTION

In light-frame construction. buildings are constructed according to the location of country and local building codes. As the inspector, you must be familiar with these codes and regulations. In some areas of the country, buildings must be constructed with special resistance to wind and rain. In other locations a building is constructed according to other disaster problems, such as locations prone to earthquakes, cold climates, snow loads, and humid climates. All require quality construction and special designs. Structures should be built to reduce the effects of shrinkage, warping, and resistance to fire hazards.

This section will not cover all aspects of inspecting light framed construction; however, as an inspector or crew leader, you need to be knowledgeable about what to look for when inspecting this type of construction.

Wood Floors

Wood floors for buildings of frame construction usually consist of finished flooring laid on subflooring that is supported by floor joists. Wood floors usually consist of planks surfaced on four sides (S4S), laid on edge with tight joints, and supported by floor beams of dimensional timber spaced at fairly long spans as specified in the drawings and specifications.

As the inspector, you must ensure the following:

That all lumber is of the specified grade and type according to specifications.

That all beams are true.

That flooring material is resting squarely on the joist.

That floor joists are the correct size and overall length, and are sound and free from excessive warp.

That the floor joists are installed bearing on sills or beams or supported by straps or hangers, and that are braced with cross bridging and/or with solid bridging, as specified.

That the tops of the floor joists are brought to a true, level plane.

That subflooring of the specified kind, grade, and size is installed, made tight, and thoroughly nailed.

That building paper is laid, if prescribed.

Wood floors are frequently installed on steel framing, particularly in light industrial buildings where steel bar joists are used. In some cases, floor joists are installed on the steelwork, and the wood floor construction is the same as for frame construction. In other cases, floor decking, consisting of heavy planking with square, shiplap, or tongue-and-groove joints, is