One inch thick, supported at both ends.

For other thicknesses, multiply the load in table by the thickness of the beam in inches. For concentrated load at centre divide by two. For permanent loads such as masonry, reduce 10 per cent.

Span in feet.

Depth of Beam in Inches.

4

6

7

8

9

10

12

14

15

16

lbs.

lbs.

lbs.

lbs.

lbs.

lbs.

lbs.

lbs.

lbs.

lbs.

6

873

840

1,143

1,493

1,890

2,333

3,360

4,573

5,250

5,973

8

280

630

857

1,120 .

1,417

1,750

2,520

8,430

3,937

4,480

10

284

504

686

896

1,134

1,400

2,016

2,744

3,150

3,584

12

• • •

420

572

746

945

1,166

1,680

2,286

2,625

2,986

14

• • • •

300

490

640

810

1,000

1,440

1,960

1.875

2,540

15

• • • •

• • •

457

597

756

933

1,344

1,828

2,100

2,388

16

• • •

• • •

• • • •

560

708

875

1,260

1,715

1,968

2,240

17

• ....•

• • • •

• • • •

• • •

667

824

1,186

1,614

1,853

2,108

18

• • • •

• • •

• • • •

• • • •

• • •

777

1,120

1,524

1,750

1,991

20

• • •

• • •

• • •

• • •

• • •

700

1,018

1,372

1,575

1,792

22

• • • •

• • • •

• • •

• • • •

• • •

• • • •

• • • •

1,247

1,431

1,629

23

• • •

• • • •

• • • •

• • •

• • •

• • • •

• •

1,184

1,369

1,558

24

• • • •

• • • •

•

• • •

• • • •

• • •

• • • •

1,143

1,312

1,493

25

• • • •

• •

• •

.• • •

• • •

• •

• • •

1,097

1.260

1,433

Loads below and to the left of heavy line may crack plastered ceilings.

For Oregon or Texas pine beams take 9/10 -ths of load in Table VI; for common white pine, 6/10; and for hemlock, 65/100. Norway pine has about the same strength as spruce.