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 13/16 " x 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.
Fig. 118. Plaster Grounds.
Fig. 119. Detail of Partition Wall.
For grounds on external corners in a room, metallic corners especially manufactured for this purpose are recommended.
The beginner will be surprised at the numberless places requiring attention in preparing for the plasterer. He should visualize every corner and angle as he thinks the plasterer or lather must have it.