Fig. 90. Sheathing
Roof sheeting for shingle roofs may best be of unmatched boards spaced about 2" apart. For slate, matched stock should be used and this covered with a tar or asphalt paper.
Fig. 91. Setting T-bevel for Roof Boards
In making the face cut on roof boards for hips or valleys the framing tool or the T-bevel may be made use of, being set to the complement of the angle used in making the side or cheek cut on jack rafters. The complement angle in this case equals 90 less the angle of the side cut of jack. Or, if the framing square is to be used, the same numbers used in making the side cut of the jack will be used in laying out the face cut of roof boards, with the scribing being done along the tongue instead of along the blade as in the case of the side cut.
A second T-bevel may be set as in [Fig. 91], the beam being placed across the edge of the jack and at right angles to it, with the blade adjusted to the cheek or sawed surface of the jack which is to fit against hip or valley rafter. A framing tool might be used.
Carpenters more frequently, however, get the angles for sawing roof boards by laying the board to be cut out over the hip or valley rafter, then sawing along the side the rafter as in [Fig. 92.]
In warm climates, weather boarding is often applied directly to the studs, no sheeting being used; the frame being strongly braced at the corners.
50. Scaffolding.—Cornice is placed after sheeting. To do this advantageously it is necessary to erect scaffolding or staging. [Fig. 93] illustrates a common type. Stock 2" × 4" is used for the uprights, and 1" × 6" for the horizontal members and braces or stays. Planks are placed upon these horizontals as shown. [Fig. 94] illustrates a substitute for staging, a scaffold bracket upon which planks are laid.