Copyright Goodheart-Willcox Co., Inc. 218 Section 4 Reading Prints Metal studs and joists are manufactured with punched holes in the web to accommodate plumbing and electrical installations. The holes in the web are provided 12″ from each end, with intermediate holes ″ at intervals of 24″. Exterior/Interior Finish The elevation drawings and wall sections show the exterior finish materials. The exterior finish includes the siding, cornice, roofing, exterior windows, and doors. See Figure 12-25. Also, dimensions of ceiling heights, roof pitch, and cornice details are given. Window units are designated with an “O” for a fixed section and an “X” for a sliding section. Interior finish information may be placed in a finish schedule. Stair width A B C Straight run Long-L Double-L and U Goodheart-Willcox Publisher Figure 12-22. Three styles of stairs. A—Straight run stairs are the simplest to design and construct. B—Long-L stairs are used when a change of direction is needed or if the rise is large enough to require a landing. C—Either the double-L or U is used when the stair must turn 180°. Goodheart-Willcox Publisher Figure 12-23. A variety of metal framing components is used in this commercial building project. Although residential use continues to grow, most metal framing today is used in commercial buildings.