For walls from 35 to 40 feet high 8 in. by 8 in. may be the scantling for each shore
For walls from 40 to 50 feet high 9 in. by 9 in. may be the scantling for each shore
For walls from 50 feet and upwards 12 in. by 9 in. may be the scantling for each shore
In the greatest length, the beams are 12 in. by 9 in. to give increased rigidity, which prevents any likelihood of sagging.
The wall plate is the first timber put into position. It is placed vertically down the face of the wall, and held in its position by wall hooks. Note should then be taken of the position of floors. If the floor joists run at right angles to the wall, the shore should abut on the wall in such position that it points directly below the wall plate carrying the floor joist. If the joists run parallel to the wall, the shore should act directly on a point representing the meeting of lines drawn down the centre of the wall and across the centre of the floor (see [fig. 50]).
Fig. 50
To enable the shore to fulfil this condition, the needle (of 4 in. by 3 in.) should be let through the plate 41⁄2 inches into the wall below the point in question. To strengthen the needle cleats are nailed, and slightly let into the plate immediately above.
The footing, or sole piece, has next to be laid. It consists of a timber 11 in. by 3 in., and long enough to take the bottom ends of the required number of shores. Attention should be paid to the ground in which it is to be bedded, and if this is at all soft, additional timbers should be laid under, and at right angles with it, to give greater bearing.
The sole piece should not be laid at right angles to the shore, but its face should form, with the outside line of the top shore, an angle somewhat wider, say of 93 degrees. The advantage of this will be seen presently.