and 4. Place the wire X from batter board 1 over

midway between the two marks thus found. Vertical

stakes A and B to batter board 3.

distance can then be measured up or down from the

batter board lines.

batter boards 5 and 6. Place the wire Y from batter

board 2 over stakes A and C to batter board 6.

There are two generally accepted methods for

squaring building lines commonly used by the

batter boards 7 and 8. Place the wire Z from batter

carpenter: the diagonal method and the 3 - 4 - 5

board 5 over stakes C and D to batter board 7.

triangle method.

batter boards 8 and 4.

corners are square, the diagonals will be of equal

length. These diagonals are seldom equal on the first

trial; therefore, we must adjust the sides so that the

with the top of the subfloor a specified minimum

building will be square. Referring to figure 1-39, let

distance off the ground, it will usually be found

us assume that when the diagonals were measured

convenient to mark the height of subfloor above the

BC was shorter than AD. It has already been

ground on the batter board post at the "high" corner

established that al sides are the correct length and

(the corner where the existing grade is highest). The

also that side AB is always the base. Therefore, all of

top of the batter board will be placed at the mark and

the adjustments are made by moving the wires on

will represent the top of the subfloor. The first batter

batter boards 6 and 8 either to the left or the right. In

board crosspiece is located by placing the top edge

this case, the wire BD should be moved to the right a

crosspiece in line with the mark on the post and

sufficient distance on batter board 8, and AC a

leveling the crosspiece with a carpenters level, then

corresponding distance on batter board 6. The

fastening the crosspiece to the posts with nails. The

diagonals are then measured. If they are not yet the

same procedure is used for the second batter board

same length, the process is repeated until the

crosspiece. Now the problem is to carry this

diagonals are equal. When the outline is correct, saw

reference level to the other corners, thereby

cuts are made in the outside edges of the batter board

maintaining a truly horizontal plane. This is best

to mark and hold the correct location of the wires.

done with a transit but it can be accomplished with a

line level. With the wire attached to the established

batter board, attach a line level at the center of the

39, the distance AF is measured. AF is3 feet or a

wire. Move the free end of the wire up and down on

multiple thereof such as 6, 9, or 12. Measure off AG

the next post until the line is level. Once it is level

to a distance of 4 feet (8 feet if 6 feet was used for

mark the post and reverse the line level and repeat the

AF, 12 feet if 9 feet was used for AF, or 16 feet if 12

process. In many cases, due to variation in position

feet was used for AF). Adjust the wires until FG

and inaccuracies of the level, the reversal will give a

equals 5 feet if the other two measurements used

different point on the post, but the variation should

were 3 feet and 4 feet (10 feet if 6 feet and 8 feet

not exceed 1 inch. If the variation is greater, repeat

were used, 15 feet if 9 feet and 12 feet were used, and

the procedure. The point of elevation will be a point

20 feet if 12 feet and 16 feet were used).