The accompanying table shows at a glance the respective scantlings for collar, king-post, and queen-post roofs. As to the various adaptabilities of these roofs, it may be stated that collar roofs ai'e not adaptable for roofs above 18-ft. span, because the timbers would be abnormally large, the expenditure would be exorbitant, and the roof would be unsightly. King-post roofs are applicable for roofs of 18-ft. to 30-ft. span. Queen-post roofs are applicable for roofs 30-ft. to 45-ft. span.

Description of Roof.

Span.

Tie Beam.

Principal Rafter.

King Post.

Queen Post.

Strut.

Straining

Beam.

Purlin.

Straining Sill.

Common Rafter.

Collar.

Ridge.

Feet.

Inches.

Inches.

Indies.

Inches.

Inches.

Inches.

Inces.

Inches.

Inches.

Inches.

Inches.

Collar Roof.

8

3x2

2x2

7 x 1 1/4

10

31 x 2

2 1/2 x 2

7 x 1 1/2

12

31/2x 2 1/4

3 1/2 x 2

7 x 1 1/2

14

4x2

4 1/2 x 2

9 x 1 1/2

16

4x2

5x2

9 x 1 1/2

18

4 x 2 1/4

5 1/2 x 2

9x1 1/2

King-post

Roof.

18

7x3

41/2x3

4 1/2 x 3

3 1/2 x 2

7x3

3 1/2 x 2

20

9x4

4 x 4

5x4

4x2

7x4

4x2

22

9x4

6x3

6 x 3.4

4 x 2 1/2

8x4

4 1/2 x 2

24

91/2 x 4

6 x 3 1/2

6x3 1/2

44 x 2 3/4

8x5

4 1/2 x 2

26

9x5

6x4

6x4

4x3

8 1/2 x 5

4 1/2x 2 1/4

28

10 x 5

6x4

6x6

4 1/2 x 3

8 3/4 x 5 1/4

41/2 x 2 1/3

30

11 x 6

6x5

7x6

6x3

8x6

4 1/2 x 24

Queen-post Roof.

30

9x4

5 1/2 x 4

4 1/2 x 4

4x3

7x4

8x4

4x4

4x2

32

10 x 4

6 x 4

5x4

4 x 3 1/2

7 1/2 x 4

8x4

4 1/2 x 4

4x2

31

10 x 5

6 1/2 x 4

6x4

4 1/2x 3 1/2

8x4

8 1/2 x 5

5 x 4

44 x 2

33

10 x 6

6 1/2 x 5

7x4

5 x31/2

8 x 4 1/2

8 1/2 x 5

5x4

4 1/2x2

38

10 x 6

6x6

7x5

5x4

8x5

8 3/4 x 5 1/4

5 x 4 1/2

4 1/2 x 2

40

11 x 0

7x6

7x6

6x4

8 1/2 x 5

8x6

5 x 4 1/2

4 1/2 x 2

42

11 1/2 x 6

7x6

8x4

6x5

8x6

9x5

6x4

4 3/4 x 2

45

12 1/2 x 6

7 1/4 x 6

8x6

6x6

8x6

9x6

6x4

5x2