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The Archive EditionThe Original Blue Bookreference tableIdentical across 3 editions1925 to today

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

Jack rafter spacing tables: how much to add or subtract per jack at standard 16, 18, 20, and 24 inch spacings. The numbers framers reach for when the layout is ahead of the saw.

Edition

1925

Chapter

reference table

Page

43 of 46

Status

Digitized

1925Reference

Since 1925

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

Reference Table

Difference in Length of Jack Rafters of Various Spacing

Rows

Rise
16"
1'- 4 1/16"
18"
1'- 6 6/8"
20"
1'- 8 1/8"
24"
2'- 1/8"
Rise
16"
1'- 4 1/4"
18"
1'- 6 1/4"
20"
1'- 8 1/4"
24"
2'- 3/8"
Rise
16"
1'- 4 1/2"
18"
1'- 7"
20"
1'- 8 1/4"
24"
2'- 3/4"
Rise
16"
1'- 4 6/8"
18"
1'- 7"
20"
1'- 8 1/4"
24"
2'- 13/8"
Rise
16"
1'- 5 3/8"
18"
1'- 7 1/2"
20"
1'- 9 1/8"
24"
2'- 2"
Rise
16"
1'- 5 7/8"
18"
1'- 7 1/2"
20"
1'- 9 1/8"
24"
2'- 2 7/8"
Rise
16"
1'- 6 1/2"
18"
1'- 8 1/8"
20"
1'- 10 1/8"
24"
2'- 3 7/8"
Rise
16"
1'- 7 1/4"
18"
1'- 8 1/2"
20"
1'- 10 3/8"
24"
2'- 4 7/8"
Rise
16"
1'- 8"
18"
1'- 9 5/8"
20"
2'- 1"
24"
2'- 6"
Rise
16"
1'- 8 7/8"
18"
1'-10 1/2"
20"
2'- 1"
24"
2'- 7 1/4"
Rise
16"
1'- 9 3/4"
18"
1'-11 3/8"
20"
2'- 1 3/8"
24"
2'- 8 5/8"
Rise
16"
1'-10 5/8"
18"
2'- 1 1/2"
20"
2'- 1 1/2"
24"
2'-10"
Rise
16"
1'-11 3/8"
18"
2'- 2 1/2"
20"
2'- 2 1/2"
24"
2'-11 3/8"
Rise
16"
1'-11 5/8"
18"
2'- 3 5/8"
20"
2'- 3 3/4"
24"
3'- 7/8"
Rise
16"
2'- 1 5/8"
18"
2'- 4 3/4"
20"
2'- 4 1/2"
24"
3'- 2 3/8"
Rise
16"
2'- 2 5/8"
18"
2'- 6"
20"
2'- 6 1/2"
24"
3'- 4"
Rise
16"
2'- 3 3/4"
18"
2'- 7 1/4"
20"
2'- 7 1/4"
24"
3'- 5 5/8"
Rise
16"
2'- 4 7/8"
18"
2'- 8 1/2"
20"
3'- 0"
24"
3'- 7 1/4"
Rise
16"
2'- 6"
18"
2'- 9 3/4"
20"
3'- 1 1/2"
24"
3'- 9"
Rise
16"
2'- 7 1/8"
18"
2'-11"
20"
3'- 2 7/8"
24"
3'-10 5/8"
Rise
16"
2'- 8 1/4"
18"
3'- 1/4"
20"
3'- 4 1/4"
24"
4'- 3/8"
Rise
16"
2'- 9 3/4"
18"
3'- 1 5/8"
20"
3'- 5 3/4"
24"
4'- 2 1/8"
Rise
16"
2'-10 5/8"
18"
3'- 3"
20"
3'- 7 1/4"
24"
4'- 3 7/8"
Rise
16"
2'-11 3/4"
18"
3'- 4 1/4"
20"
3'- 8 3/4"
24"
4'- 5 5/8"
Rise
16"
3'- 2 1/4"
18"
3'- 7"
20"
3'-11 7/8"
24"
4'- 9 3/4"
Rise
16"
3'- 4 1/2"
18"
3'- 9 3/4"
20"
4'- 2 3/4"
24"
5'- 7/8"
Rise
16"
3'- 7"
18"
4'- 1/2"
20"
4'- 5 7/8"
24"
5'- 4 5/8"

Column 0216"	Column 0318"	Column 0420"	Column 0524"
1'- 4 1/16"	1'- 6 6/8"	1'- 8 1/8"	2'- 1/8"
1'- 4 1/4"	1'- 6 1/4"	1'- 8 1/4"	2'- 3/8"
1'- 4 1/2"	1'- 7"	1'- 8 1/4"	2'- 3/4"
1'- 4 6/8"	1'- 7"	1'- 8 1/4"	2'- 13/8"
1'- 5 3/8"	1'- 7 1/2"	1'- 9 1/8"	2'- 2"
1'- 5 7/8"	1'- 7 1/2"	1'- 9 1/8"	2'- 2 7/8"
1'- 6 1/2"	1'- 8 1/8"	1'- 10 1/8"	2'- 3 7/8"
1'- 7 1/4"	1'- 8 1/2"	1'- 10 3/8"	2'- 4 7/8"
1'- 8"	1'- 9 5/8"	2'- 1"	2'- 6"
1'- 8 7/8"	1'-10 1/2"	2'- 1"	2'- 7 1/4"
1'- 9 3/4"	1'-11 3/8"	2'- 1 3/8"	2'- 8 5/8"
1'-10 5/8"	2'- 1 1/2"	2'- 1 1/2"	2'-10"
1'-11 3/8"	2'- 2 1/2"	2'- 2 1/2"	2'-11 3/8"
1'-11 5/8"	2'- 3 5/8"	2'- 3 3/4"	3'- 7/8"
2'- 1 5/8"	2'- 4 3/4"	2'- 4 1/2"	3'- 2 3/8"
2'- 2 5/8"	2'- 6"	2'- 6 1/2"	3'- 4"
2'- 3 3/4"	2'- 7 1/4"	2'- 7 1/4"	3'- 5 5/8"
2'- 4 7/8"	2'- 8 1/2"	3'- 0"	3'- 7 1/4"
2'- 6"	2'- 9 3/4"	3'- 1 1/2"	3'- 9"
2'- 7 1/8"	2'-11"	3'- 2 7/8"	3'-10 5/8"
2'- 8 1/4"	3'- 1/4"	3'- 4 1/4"	4'- 3/8"
2'- 9 3/4"	3'- 1 5/8"	3'- 5 3/4"	4'- 2 1/8"
2'-10 5/8"	3'- 3"	3'- 7 1/4"	4'- 3 7/8"
2'-11 3/4"	3'- 4 1/4"	3'- 8 3/4"	4'- 5 5/8"
3'- 2 1/4"	3'- 7"	3'-11 7/8"	4'- 9 3/4"
3'- 4 1/2"	3'- 9 3/4"	4'- 2 3/4"	5'- 7/8"
3'- 7"	4'- 1/2"	4'- 5 7/8"	5'- 4 5/8"

Click any value to copy it. Use arrow keys to navigate.

Column 01Rise

Column 0216"

Column 0318"

Column 0420"

Column 0524"

1'- 4 1/16"

1'- 6 6/8"

1'- 8 1/8"

2'- 1/8"

1'- 4 1/4"

1'- 6 1/4"

1'- 8 1/4"

2'- 3/8"

1'- 4 1/2"

1'- 7"

1'- 8 1/4"

2'- 3/4"

1'- 4 6/8"

1'- 7"

1'- 8 1/4"

2'- 13/8"

1'- 5 3/8"

1'- 7 1/2"

1'- 9 1/8"

2'- 2"

1'- 5 7/8"

1'- 7 1/2"

1'- 9 1/8"

2'- 2 7/8"

1'- 6 1/2"

1'- 8 1/8"

1'- 10 1/8"

2'- 3 7/8"

1'- 7 1/4"

1'- 8 1/2"

1'- 10 3/8"

2'- 4 7/8"

1'- 8"

1'- 9 5/8"

2'- 1"

2'- 6"

1'- 8 7/8"

1'-10 1/2"

2'- 1"

2'- 7 1/4"

1'- 9 3/4"

1'-11 3/8"

2'- 1 3/8"

2'- 8 5/8"

1'-10 5/8"

2'- 1 1/2"

2'-10"

1'-11 3/8"

2'- 2 1/2"

2'-11 3/8"

1'-11 5/8"

2'- 3 5/8"

2'- 3 3/4"

3'- 7/8"

2'- 1 5/8"

2'- 4 3/4"

2'- 4 1/2"

3'- 2 3/8"

2'- 2 5/8"

2'- 6"

2'- 6 1/2"

3'- 4"

2'- 3 3/4"

2'- 7 1/4"

3'- 5 5/8"

2'- 4 7/8"

2'- 8 1/2"

3'- 0"

3'- 7 1/4"

2'- 6"

2'- 9 3/4"

3'- 1 1/2"

3'- 9"

2'- 7 1/8"

2'-11"

3'- 2 7/8"

3'-10 5/8"

2'- 8 1/4"

3'- 1/4"

3'- 4 1/4"

4'- 3/8"

2'- 9 3/4"

3'- 1 5/8"

3'- 5 3/4"

4'- 2 1/8"

2'-10 5/8"

3'- 3"

3'- 7 1/4"

4'- 3 7/8"

2'-11 3/4"

3'- 4 1/4"

3'- 8 3/4"

4'- 5 5/8"

3'- 2 1/4"

3'- 7"

3'-11 7/8"

4'- 9 3/4"

3'- 4 1/2"

3'- 9 3/4"

4'- 2 3/4"

5'- 7/8"

3'- 7"

4'- 1/2"

4'- 5 7/8"

5'- 4 5/8"

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

Difference in Length of Jack Rafters of Various Spacing

The Blue Book is for Swanson members.

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

DIFFERENCE IN LENGTH OF JACK RAFTERS OF VARIOUS SPACING

Difference in Length of Jack Rafters of Various Spacing

The Blue Book is for Swanson members.