7-6. PROPER WOOD FOR SHORING. The best woods available for shores are Douglas fir and yellow pine. Hemlock
and Spruce can be used, but they are not as strong. The wood used for shores should be straight grained and relatively
free from knots and cracks. Shores could be treated with a fire-resisting chemical and should never be painted.
Section V. PREPARING SHORING MATERIAL
7-7. LENGTH OF A SHORE. In use, the length of a shore should never be more than 30 times its minimum thickness;
therefore, a shore that is 4 by 6 inches should not be longer than 10 feet. The shorter the shore is in relation to its
thickness, the greater the weight it will support.
7-8. MEASURING AND CUTTING SHORES USING A BATTEN. The most rapid and accurate way to measure shores
for cutting is by using an adjustable shoring batten. An adjustable shoring batten, such as the one shown in FIGURE 7-1
can be made from materials aboard the vessel. To use the shoring batten, extend it to the required length and lock it
with the thumbscrews on the length locking device. Measure the angles of cut by adjusting the hinged metal pieces at
the ends of the batten, and lock the angle locking device in place. Lay the batten along the shore, and mark and cut the
timber to the proper length and angle. Shores should be cut 1/2 inch shorter than the measured length to allow space for