Fig. 116. Siding Circular Tower
Occasionally the carpenter is called upon to side a circular tower or rounded corner of a building. That the lower edge of each board may rest in a horizontal plane it will be necessary to shape that edge before applying the board to the side of the building. To determine the amount of curvature to give such an edge proceed as follows: (1) Plot a curve to represent the plan of the tower, [Fig. 116.] Draw this upon a scale sufficiently large and make use of accuracy such as will insure a result equal to the requirements of the occasion. (2) Draw the line A-B of indefinite length. (3) Place a section of a clapboard in the position it will have on the sheeting, as at abc, [Fig. 116], and (4) extend a line along the face surface to meet A-B. (5) With a radius equal to B-C describe an arc with B as a center which shall cut the siding board as shown, taking an equal amount off the edge at each end.
Occasionally it becomes necessary to fit a casing against a sided wall. This casing is scribed as indicated in [Fig. 117], a pair of sharp dividers being made to follow the contour of the wall with one point while the other marks or scribes the casing. A saw will be used to cut to these lines, sawing under slightly to insure a fit at the face.
Fig. 117. Scribing against Irregular Surface
CHAPTER VI
Interior Finish
58. Lathing; Grounds.—Lathing is usually considered a part of the plasterer's work but the carpenter is expected to prepare the grounds and place the necessary furrings. The success of the plasterer depends in no small degree upon the way the carpenter does this work. If corners are not firmly constructed, cracks will be sure to appear in the plastering.
In lathing, joints must be broken upon different studding every dozen lath, and joints are not to be allowed about a door or window opening where their presence would weaken the wall; such as short lath nailed at one end only. Neither are lath to be placed at right angles to the usual run of lath on the wall because uneven shrinkage would cause the plaster to crack.
That the plasterer may make walls true and of uniform thickness about door and window openings and along the floor, grounds are placed as in [Fig. 118.] Such grounds are of stock if 13/16" × 1" or 2" nailed firmly to the studding. Grounds for base should be placed so that the wall may be lathed and plastered entirely to the floor that cold and vermin may be kept out.
