This first step in making the structure is extremely important, as the success of the following work depends on it.
Fig. 218. Details of roof construction and forms of rafters
After tamping the uprights solidly, the corner posts for supporting the floor may be set in the ground. They should be of locust, cedar, or chestnut, and at least four inches in diameter. Set them in the ground not less than thirty inches, and flush with the ground line. It will be better to dig out three or four inches of top soil from the whole area, and afterward fill in with gravel, as this does not hold the moisture. This precaution will help to prevent decay, and, wherever possible, all the parts in contact with the earth should be painted with creosote. The outside of posts should be five feet one way and four feet eight inches the other. Their tops should be sawed off level. This may be done after setting. Saw one post at the desired height. To level the others with it, rest a straight board on first post, and while one boy holds the level on its upper edge, let the other make a pencil mark on the next post along under side of the board. Saw to this line, and level the remaining posts in the same manner. ([Fig. 217b].)
The sill or frame for flooring must now be prepared. Use either 2 × 6 or 2 × 4 inch spruce. Cut two pieces five feet long, and two pieces four feet eight inches. Lay out half lap joints at the ends, and saw to the lines.
Spike this frame to the locust posts, and as it touches the outside of the uprights, nail to the latter, with ten-penny wire nails.
As additional support will be needed for the flooring, cut two 2 × 4, and fasten them across the frame either by half lap joint or spikes.
If this frame is planed on the outside, no finishing strip will be needed, but if it is rough sawed stock, a facing strip of 1 × 4 inch material should be placed on the outside, flush with the top of the frame.
The flooring may now be laid, using tongue and groove stock, and allowing it to project an inch beyond the frame on all four sides. The edges of this projection should be rounded with the plane. The flooring should be neatly fitted around the uprights, so that the latter may appear to come up through a solid floor 5 feet 4 inches by 5 feet 0 inches.