Checked Joint. Fig. 118.

Material: 2 pieces, 6" 1 1/2" X 7/8".

This joint is used in fitting floor timbers to sills, girders, and plates, and is a very common one in building construction. Floor timbers are sometimes mortised into the sills and girts, but this is not generally done upon ordinary work.

The size of the joint is regulated by the width of the timber, as it is measured from the upper edge, the distance from a to b being the same upon all timbers of the same floor, so that the top edges of the floor timbers will be in line, and the floor will be straight. In practice, the vertical height of the shoulder c is not considered, but the distance between the shoulders of each end is sometimes important, as it may be used to govern the distance between the walls.

1. Gauge the distance a b from the top edge.

2. Measure from the end of piece d, the thickness of piece e for the shoulder c; mark with the knife, and cut out with the backsaw. Upon ordinary work this joint is marked with a pencil.

The piece d, representing the floor joint in this exercise, may be fastened to piece e, or the sill, by a brad; or it may be glued, if preferred. Smooth and sandpaper each piece separately.

Fig. 118. - Checked Joint.