Dimension not complete

Figure 4.9 A diagram showing "not to scale" dimension (A) and "not complete" dimension (B).

ample, a finished (dressed) 2 x 4 piece is less than 2 inches thick and less than 4 inches wide. The nominal size is usually greater than the actual dimension.

When sawn lumber (nominal size) is seasoned, dressed, or planed, the size becomes smaller; this is the "actual size." For example, a piece of 2 x 4 lumber (100 x 50) may become approx 11/2 x 31/2 inches (90 x 45) when it has been dressed or planed. The actual size therefore refers to the minimum acceptable size after it has been dressed and seasoned. A nominal 2 x 4 can have a minimum actual size of 1.5 x 3.5 inches. When referring to a specific piece of lumber, the nominal size is used. Figure 4.11 shows examples of nominal and actual sizes of lumber and boards.

Figure 4.10 A drawing showing the use of reference dimensions.

NOMINAL SIZE ACTUAL SIZE

NOMINAL SIZE ACTUAL SIZE

2X 10

2X12

4X 10

11/2x1 1/2 1 1/2x2 1/2 1 1/2x3 1/2 1 1/2x5 1/2 11/2x7 1/4 11/2x9 1/4 1 1/2x11 1/4 3 1/2x3 1/2 3 1/2x5 1/2 3 1/2x9 1/4 5 1/2x5 1/2

1X10

1X12

3/4 X 1 1/2 3/4 X 2 1/2 3/4 X 3 1/2 3/4 X 4 1/2 3/4 X 5 1/2 3/4 X 7 1/4 3/4 X 9 1/4 3/4X11 1/4

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