ReferenceTopic

Building Width Adjustments

When the building width is not a clean even number of feet, the rafter table needs a small adjustment per inch of width. Two add-on tables: one for common rafters, one for hip / valley.

After reading

Look up the rafter length for any building width from 12 to 40 feet, including the add-ons for the inch fractions in between.

Composed fromCurrent · p481975 – 2010 · p42

When the master table is not enough

The master rafter length table covers any rise per foot of run. Multiply by your run in feet, you have the rafter length. But the run is half the building width, and a real building width is rarely a clean integer in feet. The "Width of Building" table covers every span from 12 to 40 feet directly. The two "Amount to Add" tables cover the inch fractions in between.

The full-width tables

Find your building width (top heading), then your inch-rise (left column). The Common and Hip columns give the rafter length directly. No multiplication needed.

WIDTH OF BUILDING

33 FEET

Reference Table

33 Feet – Common and Hip Rafter Lengths

Rows

Inch Rise
Com.
16'- 6⅝"
Hip
23'- 4½"
Inch Rise
Com.
16'- 8⅜"
Hip
23'- 6 "
Inch Rise
Com.
17'- 0 "
Hip
23'- 8¼"
Inch Rise
Com.
17'- 4¾"
Hip
23'-11¾"
Inch Rise
Com.
17'-10½"
Hip
24'- 4⅛"
Inch Rise
Com.
18'- 5⅝"
Hip
24'- 9 "
Inch Rise
Com.
19'- 1⅜"
Hip
25'- 2⅞"
Inch Rise
Com.
19'-10 "
Hip
25'- 9½"
Inch Rise
Com.
20'- 7½"
Hip
26'- 5 "
Inch Rise
Com.
21'- 5⅞"
Hip
27'- 1⅛"
Inch Rise
Com.
22'- 4⅝"
Hip
27'- 9¾"
Inch Rise
Com.
23'- 4 "
Hip
28'- 6⅞"
Inch Rise
Com.
24'- 4½"
Hip
29'- 4⅝"
Inch Rise
Com.
25'- 4¼"
Hip
30'- 3 "

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		16'- 6⅝"	23'- 4½"
		16'- 8⅜"	23'- 6 "
		17'- 0 "	23'- 8¼"
		17'- 4¾"	23'-11¾"
		17'-10½"	24'- 4⅛"
		18'- 5⅝"	24'- 9 "
		19'- 1⅜"	25'- 2⅞"
		19'-10 "	25'- 9½"
		20'- 7½"	26'- 5 "
		21'- 5⅞"	27'- 1⅛"
		22'- 4⅝"	27'- 9¾"
		23'- 4 "	28'- 6⅞"
		24'- 4½"	29'- 4⅝"
		25'- 4¼"	30'- 3 "

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

34 FEET

Reference Table

34 Feet – Common and Hip Rafter Lengths

Rows

Inch Rise
Com.
17'- ¾"
Hip
24'- 1 "
Inch Rise
Com.
17'- 2¾"
Hip
24'- 2½"
Inch Rise
Com.
17'- 6¼"
Hip
24'- 4⅞"
Inch Rise
Com.
17'-11 "
Hip
24'- 8½"
Inch Rise
Com.
18'- 5 "
Hip
25'- ⅞"
Inch Rise
Com.
19'- ⅛"
Hip
25'- 6 "
Inch Rise
Com.
19'- 8⅜"
Hip
26'- ⅛"
Inch Rise
Com.
20'- 5⅛"
Hip
26'- 6⅞"
Inch Rise
Com.
21'- 3 "
Hip
27'- 2⅝"
Inch Rise
Com.
22'- 1½"
Hip
27'-10⅞"
Inch Rise
Com.
23'- ⅞"
Hip
28'- 7¾"
Inch Rise
Com.
24'- ½"
Hip
29'- 5¼"
Inch Rise
Com.
25'- ⅞"
Hip
30'- 3¼"
Inch Rise
Com.
26'- 1½"
Hip
31'- 2 "

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		17'- ¾"	24'- 1 "
		17'- 2¾"	24'- 2½"
		17'- 6¼"	24'- 4⅞"
		17'-11 "	24'- 8½"
		18'- 5 "	25'- ⅞"
		19'- ⅛"	25'- 6 "
		19'- 8⅜"	26'- ⅛"
		20'- 5⅛"	26'- 6⅞"
		21'- 3 "	27'- 2⅝"
		22'- 1½"	27'-10⅞"
		23'- ⅞"	28'- 7¾"
		24'- ½"	29'- 5¼"
		25'- ⅞"	30'- 3¼"
		26'- 1½"	31'- 2 "

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

35 FEET

Reference Table

35 Feet – Common and Hip Rafter Lengths

Rows

Inch Rise
Com.
17'- 6¾"
Hip
24'- 9½"
Inch Rise
Com.
17'- 8⅞"
Hip
24'-11 "
Inch Rise
Com.
18'- ½"
Hip
25'- 1½"
Inch Rise
Com.
18'- 5⅜"
Hip
25'- 5¼"
Inch Rise
Com.
18'-11½"
Hip
25'- 9¾"
Inch Rise
Com.
19'- 6⅞"
Hip
26'- 3 "
Inch Rise
Com.
20'- 3⅜"
Hip
26'-10¼"
Inch Rise
Com.
21'- ⅜"
Hip
27'- 4¼"
Inch Rise
Com.
21'-10½"
Hip
28'- ¼"
Inch Rise
Com.
22'- 9⅜"
Hip
28'- 8¾"
Inch Rise
Com.
23'- 8⅞"
Hip
29'- 5⅞"
Inch Rise
Com.
24'- 9 "
Hip
30'- 3⅝"
Inch Rise
Com.
25'- 9¾"
Hip
31'- 1⅞"
Inch Rise
Com.
26'-10¾"
Hip
32'- 1 "

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		17'- 6¾"	24'- 9½"
		17'- 8⅞"	24'-11 "
		18'- ½"	25'- 1½"
		18'- 5⅜"	25'- 5¼"
		18'-11½"	25'- 9¾"
		19'- 6⅞"	26'- 3 "
		20'- 3⅜"	26'-10¼"
		21'- ⅜"	27'- 4¼"
		21'-10½"	28'- ¼"
		22'- 9⅜"	28'- 8¾"
		23'- 8⅞"	29'- 5⅞"
		24'- 9 "	30'- 3⅝"
		25'- 9¾"	31'- 1⅞"
		26'-10¾"	32'- 1 "

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

36 FEET

Reference Table

36 Feet – Common and Hip Rafter Lengths

Rows

Inch Rise
Com.
18'- ¾"
Hip
25'- 6 "
Inch Rise
Com.
18'- 2⅞"
Hip
25'- 7⅝"
Inch Rise
Com.
18'- 6⅝"
Hip
25'-10⅛"
Inch Rise
Com.
18'-11⅞"
Hip
26'- 1⅞"
Inch Rise
Com.
19'- 6 "
Hip
26'- 6⅝"
Inch Rise
Com.
20'- 1½"
Hip
27'- 0 "
Inch Rise
Com.
20'-10¼"
Hip
27'- 6½"
Inch Rise
Com.
21'- 7½"
Hip
28'- 1⅝"
Inch Rise
Com.
22'- 6 "
Hip
28'- 9¾"
Inch Rise
Com.
23'- 5⅛"
Hip
29'- 6⅝"
Inch Rise
Com.
24'- 5 "
Hip
30'- 4 "
Inch Rise
Com.
25'- 5½"
Hip
31'- 2 "
Inch Rise
Com.
26'- 6⅝"
Hip
32'- ⅝"
Inch Rise
Com.
27'- 7⅞"
Hip
33'- 0 "

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		18'- ¾"	25'- 6 "
		18'- 2⅞"	25'- 7⅝"
		18'- 6⅝"	25'-10⅛"
		18'-11⅞"	26'- 1⅞"
		19'- 6 "	26'- 6⅝"
		20'- 1½"	27'- 0 "
		20'-10¼"	27'- 6½"
		21'- 7½"	28'- 1⅝"
		22'- 6 "	28'- 9¾"
		23'- 5⅛"	29'- 6⅝"
		24'- 5 "	30'- 4 "
		25'- 5½"	31'- 2 "
		26'- 6⅝"	32'- ⅝"
		27'- 7⅞"	33'- 0 "

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

WIDTH OF BUILDING

Reference Table

37 FEET

Rows

Inch Rise
Com.
18'- 6¾"
Hip
26'- 2½"
Inch Rise
Com.
18'- 9"
Hip
26'- 4⅛"
Inch Rise
Com.
19'- ¾"
Hip
26'- 6¾"
Inch Rise
Com.
19'- 6⅛"
Hip
26'-10⅝"
Inch Rise
Com.
20'- ½"
Hip
27'- 3½"
Inch Rise
Com.
20'- 8¼"
Hip
27'- 9"
Inch Rise
Com.
21'- 5¼"
Hip
28'- 3⅝"
Inch Rise
Com.
22'- 2¾"
Hip
28'-11"
Inch Rise
Com.
23'- 1½"
Hip
29'- 7⅜"
Inch Rise
Com.
24'- 1"
Hip
30'- 4½"
Inch Rise
Com.
25'- 1⅛"
Hip
31'- 2⅛"
Inch Rise
Com.
26'- 2"
Hip
32'- ⅜"
Inch Rise
Com.
27'- 3½"
Hip
32'-11¼"
Inch Rise
Com.
28'- 5⅛"
Hip
33'-11"

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		18'- 6¾"	26'- 2½"
		18'- 9"	26'- 4⅛"
		19'- ¾"	26'- 6¾"
		19'- 6⅛"	26'-10⅝"
		20'- ½"	27'- 3½"
		20'- 8¼"	27'- 9"
		21'- 5¼"	28'- 3⅝"
		22'- 2¾"	28'-11"
		23'- 1½"	29'- 7⅜"
		24'- 1"	30'- 4½"
		25'- 1⅛"	31'- 2⅛"
		26'- 2"	32'- ⅜"
		27'- 3½"	32'-11¼"
		28'- 5⅛"	33'-11"

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

Reference Table

38 FEET

Rows

Inch Rise
Com.
19'- ¾"
Hip
26'-11"
Inch Rise
Com.
19'- 3"
Hip
27'- ¾"
Inch Rise
Com.
19'- 7"
Hip
27'- 3⅜"
Inch Rise
Com.
20'- ⅜"
Hip
27'- 7⅜"
Inch Rise
Com.
20'- 7"
Hip
28'- ⅜"
Inch Rise
Com.
21'- 3"
Hip
28'- 6"
Inch Rise
Com.
22'- ⅛"
Hip
29'- 7⅞"
Inch Rise
Com.
22'-10"
Hip
29'- 8½"
Inch Rise
Com.
23'- 9"
Hip
30'- 5"
Inch Rise
Com.
24'- 8¾"
Hip
31'- 2⅜"
Inch Rise
Com.
25'- 9⅜"
Hip
32'- ⅛"
Inch Rise
Com.
26'-10½"
Hip
32'-10⅞"
Inch Rise
Com.
28'- ⅜"
Hip
33'-10"
Inch Rise
Com.
29'- 2⅜"
Hip
34'-10"

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		19'- ¾"	26'-11"
		19'- 3"	27'- ¾"
		19'- 7"	27'- 3⅜"
		20'- ⅜"	27'- 7⅜"
		20'- 7"	28'- ⅜"
		21'- 3"	28'- 6"
		22'- ⅛"	29'- 7⅞"
		22'-10"	29'- 8½"
		23'- 9"	30'- 5"
		24'- 8¾"	31'- 2⅜"
		25'- 9⅜"	32'- ⅛"
		26'-10½"	32'-10⅞"
		28'- ⅜"	33'-10"
		29'- 2⅜"	34'-10"

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

Reference Table

39 FEET

Rows

Inch Rise
Com.
19'- 6¾"
Hip
27'- 7½"
Inch Rise
Com.
19'- 9⅛"
Hip
27'- 9¼"
Inch Rise
Com.
20'- 1⅛"
Hip
28'- 0"
Inch Rise
Com.
20'- 6¾"
Hip
28'- 4⅛"
Inch Rise
Com.
21'- 1½"
Hip
28'- 9¼"
Inch Rise
Com.
21'- 9¾"
Hip
29'- 3"
Inch Rise
Com.
22'- 7⅛"
Hip
29'-10"
Inch Rise
Com.
23'- 5¼"
Hip
30'- 5⅞"
Inch Rise
Com.
24'- 4½"
Hip
31'- 2⅝"
Inch Rise
Com.
25'- 4⅝"
Hip
32'- ¼"
Inch Rise
Com.
26'- 5½"
Hip
32'-10¼"
Inch Rise
Com.
27'- 7"
Hip
33'- 9¼"
Inch Rise
Com.
28'- 9¼"
Hip
34'- 8⅝"
Inch Rise
Com.
29'-11⅝"
Hip
35'- 9"

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		19'- 6¾"	27'- 7½"
		19'- 9⅛"	27'- 9¼"
		20'- 1⅛"	28'- 0"
		20'- 6¾"	28'- 4⅛"
		21'- 1½"	28'- 9¼"
		21'- 9¾"	29'- 3"
		22'- 7⅛"	29'-10"
		23'- 5¼"	30'- 5⅞"
		24'- 4½"	31'- 2⅝"
		25'- 4⅝"	32'- ¼"
		26'- 5½"	32'-10¼"
		27'- 7"	33'- 9¼"
		28'- 9¼"	34'- 8⅝"
		29'-11⅝"	35'- 9"

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

Reference Table

40 FEET

Rows

Inch Rise
Com.
20'- ¾"
Hip
28'- 4"
Inch Rise
Com.
20'- 3¾"
Hip
28'- 5¾"
Inch Rise
Com.
20'- 7⅜"
Hip
28'- 8⅝"
Inch Rise
Com.
21'- 1"
Hip
29'- ¾"
Inch Rise
Com.
21'- 8"
Hip
29'- 6"
Inch Rise
Com.
22'- 4⅜"
Hip
30'- 0"
Inch Rise
Com.
23'- 2"
Hip
30'- 7¼"
Inch Rise
Com.
24'- ⅜"
Hip
31'- 3¼"
Inch Rise
Com.
25'- 0"
Hip
32'- ¼"
Inch Rise
Com.
26'- ⅜"
Hip
32'-10⅛"
Inch Rise
Com.
27'- 1⅝"
Hip
33'- 8⅜"
Inch Rise
Com.
28'- 3⅜"
Hip
34'- 7⅝"
Inch Rise
Com.
29'- 6"
Hip
35'- 7⅜"
Inch Rise
Com.
30'- 8⅞"
Hip
36'- 8"

	Column 01Inch Rise	Column 02Com.	Column 03Hip
		20'- ¾"	28'- 4"
		20'- 3¾"	28'- 5¾"
		20'- 7⅜"	28'- 8⅝"
		21'- 1"	29'- ¾"
		21'- 8"	29'- 6"
		22'- 4⅜"	30'- 0"
		23'- 2"	30'- 7¼"
		24'- ⅜"	31'- 3¼"
		25'- 0"	32'- ¼"
		26'- ⅜"	32'-10⅛"
		27'- 1⅝"	33'- 8⅜"
		28'- 3⅜"	34'- 7⅝"
		29'- 6"	35'- 7⅜"
		30'- 8⅞"	36'- 8"

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

Adjusting for inch fractions

When the building width is, say, 26 feet 7 inches, look up 26 feet on the main table, then add the value from this table for 7 inches at your pitch. The rule for unlisted rises sits at the bottom of the table.

AMOUNT TO ADD TO COMMON RAFTER FOR 1 TO 11 INCHES IN BUILDING WIDTH

Reference Table

Amount to Add to Common Rafter for 1 to 11 Inches in Building Width

Rows

Rise
1
1/2
2
3
1 1/2
4
5
2 1/2
6
3 1/8
7
3 5/8
8
4 1/8
9
4 5/8
10
5 1/8
11
5 5/8
Rise
1
1/2
2
3
1 1/2
4
5
2 1/2
6
3 1/8
7
3 5/8
8
4 1/8
9
4 5/8
10
5 1/8
11
5 5/8
Rise
1
1/2
2
3
1 1/2
4
5
2 1/2
6
3 1/8
7
3 5/8
8
4 1/8
9
4 5/8
10
5 1/8
11
5 5/8
Rise
1
5/8
2
1 1/8
3
1 5/8
4
2 1/8
5
2 5/8
6
3 1/4
7
3 3/4
8
4 1/4
9
4 3/4
10
5 1/4
11
5 7/8
Rise
1
5/8
2
1 1/8
3
1 5/8
4
2 1/4
5
2 3/4
6
3 1/4
7
3 3/4
8
4 3/8
9
4 7/8
10
5 3/8
11
5 7/8
Rise
1
5/8
2
1 1/8
3
1 5/8
4
2 1/4
5
2 3/4
6
3 1/4
7
3 3/4
8
4 3/8
9
4 7/8
10
5 3/8
11
Rise
1
5/8
2
1 1/8
3
1 5/8
4
2 3/8
5
6
3 1/2
7
8
4 5/8
9
5 1/4
10
5 3/4
11
6 3/8
Rise
1
5/8
2
1 1/4
3
1 3/4
4
2 3/8
5
6
3 5/8
7
4 1/8
8
4 3/4
9
5 1/2
10
11
6 5/8
Rise
1
5/8
2
1 1/4
3
1 7/8
4
2 1/2
5
3 1/8
6
3 3/4
7
4 3/8
8
9
5 5/8
10
6 1/4
11
6 7/8
Rise
1
5/8
2
1 3/8
3
4
2 5/8
5
3 1/4
6
3 7/8
7
4 1/2
8
5 3/8
9
5 7/8
10
6 1/2
11
7 1/8
Rise
1
3/4
2
1 3/8
3
4
2 3/4
5
3 1/2
6
4 1/8
7
4 3/4
8
5 3/8
9
6 1/8
10
6 3/4
11
7 1/2
Rise
1
3/4
2
1 3/8
3
2 1/8
4
2 3/4
5
3 1/2
6
4 1/4
7
8
5 5/8
9
6 3/8
10
11
7 3/4
Rise
1
3/4
2
1 1/2
3
2 1/4
4
5
3 5/8
6
4 3/8
7
5 1/8
8
9
6 5/8
10
7 3/8
11
8 1/8
Rise
1
3/4
2
1 5/8
3
2 3/8
4
3 1/8
5
3 7/8
6
4 5/8
7
5 3/8
8
6 1/4
9
6 7/8
10
7 3/4
11
8 1/2
Rise
1
3/4
2
1 5/8
3
2 3/8
4
3 1/4
5
6
4 3/4
7
5 5/8
8
6 1/2
9
7 1/4
10
11
8 3/4
Rise
1
7/8
2
1 3/4
3
2 1/2
4
3 3/8
5
4 1/8
6
7
5 3/4
8
6 5/8
9
7 1/2
10
8 1/4
11
9 1/8
Rise
1
7/8
2
1 3/4
3
2 1/2
4
3 1/2
5
4 1/4
6
5 1/8
7
8
9
7 3/4
10
8 5/8
11
9 1/2
Rise
1
7/8
2
1 3/4
3
2 3/4
4
3 5/8
5
4 1/2
6
5 1/2
7
6 3/8
8
7 1/4
9
8 1/8
10
11
Rise
1
2
1 7/8
3
2 3/4
4
3 3/4
5
4 5/8
6
5 1/2
7
6 1/2
8
7 1/4
9
8 3/8
10
9 3/8
11
10 1/4
Rise
1
2
3
4
5
6
5 7/8
7
6 3/4
8
7 3/4
9
8 3/4
10
9 3/4
11
10 5/8
Rise
1
2
3
4
5
6
7
8
9
10
10 1/8
11
11 1/8
Rise
1
2
3
3 1/8
4
4 1/8
5
5 1/8
6
6 1/4
7
7 1/4
8
8 3/8
9
9 3/8
10
10 3/8
11
11 1/2
Rise
1
1 1/8
2
2 1/8
3
3 1/4
4
4 1/4
5
5 3/8
6
6 1/2
7
7 1/2
8
8 5/8
9
9 3/4
10
10 3/4
11
11 7/8
Rise
1
1 1/8
2
2 1/4
3
3 3/8
4
4 1/2
5
5 5/8
6
6 3/4
7
7 7/8
8
9
10
11 1/4
11
12 3/8
Rise
1
1 1/4
2
2 3/8
3
3 1/2
4
4 3/4
5
6
7 1/8
7
8 3/8
8
9 1/2
9
10 3/4
10
11 7/8
11
13 1/8
Rise
1
1 1/4
2
2 1/2
3
3 7/8
4
5 1/8
5
6 3/8
6
7 5/8
7
8 7/8
8
10 1/8
9
11 1/2
10
12 3/4
11
Rise
1
1 3/8
2
2 5/8
3
4
5 3/8
5
6 3/4
6
7
9 1/2
8
10 3/4
9
12 1/8
10
13 1/2
11
14 3/4

Column 021	Column 032	Column 043	Column 054	Column 065	Column 076	Column 087	Column 098	Column 109	Column 1110	Column 1211
1/2		1 1/2		2 1/2	3 1/8	3 5/8	4 1/8	4 5/8	5 1/8	5 5/8
1/2		1 1/2		2 1/2	3 1/8	3 5/8	4 1/8	4 5/8	5 1/8	5 5/8
1/2		1 1/2		2 1/2	3 1/8	3 5/8	4 1/8	4 5/8	5 1/8	5 5/8
5/8	1 1/8	1 5/8	2 1/8	2 5/8	3 1/4	3 3/4	4 1/4	4 3/4	5 1/4	5 7/8
5/8	1 1/8	1 5/8	2 1/4	2 3/4	3 1/4	3 3/4	4 3/8	4 7/8	5 3/8	5 7/8
5/8	1 1/8	1 5/8	2 1/4	2 3/4	3 1/4	3 3/4	4 3/8	4 7/8	5 3/8
5/8	1 1/8	1 5/8	2 3/8		3 1/2		4 5/8	5 1/4	5 3/4	6 3/8
5/8	1 1/4	1 3/4	2 3/8		3 5/8	4 1/8	4 3/4	5 1/2		6 5/8
5/8	1 1/4	1 7/8	2 1/2	3 1/8	3 3/4	4 3/8		5 5/8	6 1/4	6 7/8
5/8	1 3/8		2 5/8	3 1/4	3 7/8	4 1/2	5 3/8	5 7/8	6 1/2	7 1/8
3/4	1 3/8		2 3/4	3 1/2	4 1/8	4 3/4	5 3/8	6 1/8	6 3/4	7 1/2
3/4	1 3/8	2 1/8	2 3/4	3 1/2	4 1/4		5 5/8	6 3/8		7 3/4
3/4	1 1/2	2 1/4		3 5/8	4 3/8	5 1/8		6 5/8	7 3/8	8 1/8
3/4	1 5/8	2 3/8	3 1/8	3 7/8	4 5/8	5 3/8	6 1/4	6 7/8	7 3/4	8 1/2
3/4	1 5/8	2 3/8	3 1/4		4 3/4	5 5/8	6 1/2	7 1/4		8 3/4
7/8	1 3/4	2 1/2	3 3/8	4 1/8		5 3/4	6 5/8	7 1/2	8 1/4	9 1/8
7/8	1 3/4	2 1/2	3 1/2	4 1/4	5 1/8			7 3/4	8 5/8	9 1/2
7/8	1 3/4	2 3/4	3 5/8	4 1/2	5 1/2	6 3/8	7 1/4	8 1/8
	1 7/8	2 3/4	3 3/4	4 5/8	5 1/2	6 1/2	7 1/4	8 3/8	9 3/8	10 1/4
					5 7/8	6 3/4	7 3/4	8 3/4	9 3/4	10 5/8
									10 1/8	11 1/8
		3 1/8	4 1/8	5 1/8	6 1/4	7 1/4	8 3/8	9 3/8	10 3/8	11 1/2
1 1/8	2 1/8	3 1/4	4 1/4	5 3/8	6 1/2	7 1/2	8 5/8	9 3/4	10 3/4	11 7/8
1 1/8	2 1/4	3 3/8	4 1/2	5 5/8	6 3/4	7 7/8			11 1/4	12 3/8
1 1/4	2 3/8	3 1/2	4 3/4		7 1/8	8 3/8	9 1/2	10 3/4	11 7/8	13 1/8
1 1/4	2 1/2	3 7/8	5 1/8	6 3/8	7 5/8	8 7/8	10 1/8	11 1/2	12 3/4
1 3/8	2 5/8		5 3/8	6 3/4		9 1/2	10 3/4	12 1/8	13 1/2	14 3/4

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TO FIGURE UNLISTED RISE TAKE 1/2 DIFFERENCE OF NUMBER OVER & NUMBER UNDER. EXAMPLE: 27" RISE 9" WIDTH. 10 3/4" TO 11 1/2" = 3/8". ADDED TO SMALLER NUMBER = 11 1/8".

Same correction, hip / valley column

The hip / valley table works the same way. Same building width input, same inch-rise input, different rafter scale.

AMOUNT TO ADD TO HIP-VAL RAFTER FOR 1 TO 11 INCHES IN BUILDING WIDTH

Reference Table

Amount to Add to Hip-Val Rafter for 1 to 11 Inches in Building Width

Rows

Rise
1
3/4
2
1 3/8
3
2 1/8
4
2 7/8
5
3 1/2
6
4 1/4
7
4 7/8
8
5 5/8
9
6 3/8
10
11
7 3/4
Rise
1
3/4
2
1 3/8
3
2 1/8
4
2 7/8
5
3 1/2
6
4 1/4
7
8
5 3/4
9
6 1/2
10
7 1/8
11
7 7/8
Rise
1
3/4
2
1 3/8
3
2 1/8
4
2 7/8
5
3 5/8
6
4 3/8
7
8
5 3/4
9
6 1/2
10
7 1/4
11
7 7/8
Rise
1
3/4
2
1 3/8
3
2 1/4
4
5
3 5/8
6
4 3/8
7
5 1/8
8
5 7/8
9
6 1/2
10
7 1/4
11
Rise
1
3/4
2
1 1/2
3
2 1/4
4
5
3 5/8
6
4 3/8
7
5 1/8
8
5 7/8
9
6 5/8
10
7 3/8
11
8 1/8
Rise
1
3/4
2
1 1/2
3
2 1/4
4
5
3 3/4
6
4 1/2
7
5 1/4
8
9
6 3/4
10
7 1/2
11
8 1/4
Rise
1
3/4
2
1 1/2
3
2 1/4
4
5
3 3/4
6
4 5/8
7
5 3/8
8
6 1/8
9
6 7/8
10
7 5/8
11
8 3/8
Rise
1
3/4
2
1 1/2
3
2 3/8
4
3 1/8
5
3 7/8
6
4 3/4
7
5 1/2
8
6 1/4
9
10
7 3/4
11
8 5/8
Rise
1
3/4
2
1 1/2
3
2 3/8
4
3 1/4
5
6
4 3/4
7
5 5/8
8
6 3/8
9
7 1/4
10
11
8 7/8
Rise
1
7/8
2
1 5/8
3
2 1/2
4
3 3/8
5
4 1/8
6
4 7/8
7
5 3/4
8
6 5/8
9
7 3/8
10
8 1/4
11
Rise
1
7/8
2
1 3/4
3
2 1/2
4
3 3/8
5
4 1/4
6
7
5 7/8
8
6 7/8
9
7 1/2
10
8 3/8
11
9 1/4
Rise
1
7/8
2
1 3/4
3
2 5/8
4
3 1/2
5
4 3/8
6
5 1/4
7
8
6 7/8
9
7 3/4
10
8 5/8
11
9 1/2
Rise
1
7/8
2
1 3/4
3
2 5/8
4
3 5/8
5
4 1/2
6
5 3/8
7
6 3/8
8
7 1/4
9
7 7/8
10
8 7/8
11
9 3/4
Rise
1
7/8
2
1 7/8
3
2 3/4
4
3 5/8
5
4 5/8
6
5 1/2
7
6 3/8
8
7 3/8
9
8 1/4
10
9 1/4
11
10 1/8
Rise
1
2
3
2 7/8
4
3 7/8
5
4 3/4
6
5 3/4
7
6 5/8
8
7 1/2
9
8 1/2
10
9 1/2
11
10 3/8
Rise
1
2
3
4
5
6
5 7/8
7
6 3/4
8
7 3/4
9
8 3/4
10
9 3/4
11
10 5/8
Rise
1
2
3
4
5
6
7
8
9
10
11
Rise
1
2
3
4
5
5 1/8
6
6 1/8
7
7 1/4
8
8 1/4
9
9 1/4
10
10 3/8
11
11 3/8
Rise
1
2
2 1/8
3
3 1/4
4
4 1/4
5
5 1/4
6
6 3/8
7
7 3/8
8
8 1/2
9
9 1/2
10
10 5/8
11
11 3/4
Rise
1
1 1/8
2
2 1/4
3
3 1/4
4
4 3/8
5
5 1/2
6
6 1/2
7
7 5/8
8
8 3/4
9
9 7/8
10
10 7/8
11
Rise
1
1 1/8
2
2 1/4
3
3 3/8
4
4 1/2
5
5 5/8
6
6 3/4
7
7 7/8
8
9
10 1/8
10
11 1/4
11
12 3/8
Rise
1
1 1/4
2
2 3/8
3
3 1/2
4
4 5/8
5
5 7/8
6
7
8 1/8
8
9 1/4
9
10 3/8
10
11 5/8
11
12 3/4
Rise
1
1 1/4
2
2 3/8
3
3 1/2
4
4 3/4
5
6
7 1/4
7
8 3/8
8
9 5/8
9
10 3/4
10
11 7/8
11
13 1/8
Rise
1
1 1/4
2
2 1/2
3
3 5/8
4
4 7/8
5
6 1/8
6
7 3/8
7
8 1/2
8
9 3/4
9
10
12 1/4
11
13 1/2
Rise
1
1 1/4
2
2 5/8
3
3 7/8
4
5 1/4
5
6 1/2
6
7 3/4
7
8
10 3/8
9
11 5/8
10
12 7/8
11
14 1/4
Rise
1
1 3/8
2
2 3/4
3
4 1/8
4
5 1/2
5
6 7/8
6
8 1/8
7
9 1/2
8
10 7/8
9
12 1/4
10
13 5/8
11
Rise
1
1 1/2
2
2 7/8
3
4 1/4
4
5 3/4
5
7 1/8
6
8 5/8
7
8
11 1/2
9
10
14 3/8
11
15 3/4

Column 021	Column 032	Column 043	Column 054	Column 065	Column 076	Column 087	Column 098	Column 109	Column 1110	Column 1211
3/4	1 3/8	2 1/8	2 7/8	3 1/2	4 1/4	4 7/8	5 5/8	6 3/8		7 3/4
3/4	1 3/8	2 1/8	2 7/8	3 1/2	4 1/4		5 3/4	6 1/2	7 1/8	7 7/8
3/4	1 3/8	2 1/8	2 7/8	3 5/8	4 3/8		5 3/4	6 1/2	7 1/4	7 7/8
3/4	1 3/8	2 1/4		3 5/8	4 3/8	5 1/8	5 7/8	6 1/2	7 1/4
3/4	1 1/2	2 1/4		3 5/8	4 3/8	5 1/8	5 7/8	6 5/8	7 3/8	8 1/8
3/4	1 1/2	2 1/4		3 3/4	4 1/2	5 1/4		6 3/4	7 1/2	8 1/4
3/4	1 1/2	2 1/4		3 3/4	4 5/8	5 3/8	6 1/8	6 7/8	7 5/8	8 3/8
3/4	1 1/2	2 3/8	3 1/8	3 7/8	4 3/4	5 1/2	6 1/4		7 3/4	8 5/8
3/4	1 1/2	2 3/8	3 1/4		4 3/4	5 5/8	6 3/8	7 1/4		8 7/8
7/8	1 5/8	2 1/2	3 3/8	4 1/8	4 7/8	5 3/4	6 5/8	7 3/8	8 1/4
7/8	1 3/4	2 1/2	3 3/8	4 1/4		5 7/8	6 7/8	7 1/2	8 3/8	9 1/4
7/8	1 3/4	2 5/8	3 1/2	4 3/8	5 1/4		6 7/8	7 3/4	8 5/8	9 1/2
7/8	1 3/4	2 5/8	3 5/8	4 1/2	5 3/8	6 3/8	7 1/4	7 7/8	8 7/8	9 3/4
7/8	1 7/8	2 3/4	3 5/8	4 5/8	5 1/2	6 3/8	7 3/8	8 1/4	9 1/4	10 1/8
		2 7/8	3 7/8	4 3/4	5 3/4	6 5/8	7 1/2	8 1/2	9 1/2	10 3/8
					5 7/8	6 3/4	7 3/4	8 3/4	9 3/4	10 5/8

				5 1/8	6 1/8	7 1/4	8 1/4	9 1/4	10 3/8	11 3/8
	2 1/8	3 1/4	4 1/4	5 1/4	6 3/8	7 3/8	8 1/2	9 1/2	10 5/8	11 3/4
1 1/8	2 1/4	3 1/4	4 3/8	5 1/2	6 1/2	7 5/8	8 3/4	9 7/8	10 7/8
1 1/8	2 1/4	3 3/8	4 1/2	5 5/8	6 3/4	7 7/8		10 1/8	11 1/4	12 3/8
1 1/4	2 3/8	3 1/2	4 5/8	5 7/8		8 1/8	9 1/4	10 3/8	11 5/8	12 3/4
1 1/4	2 3/8	3 1/2	4 3/4		7 1/4	8 3/8	9 5/8	10 3/4	11 7/8	13 1/8
1 1/4	2 1/2	3 5/8	4 7/8	6 1/8	7 3/8	8 1/2	9 3/4		12 1/4	13 1/2
1 1/4	2 5/8	3 7/8	5 1/4	6 1/2	7 3/4		10 3/8	11 5/8	12 7/8	14 1/4
1 3/8	2 3/4	4 1/8	5 1/2	6 7/8	8 1/8	9 1/2	10 7/8	12 1/4	13 5/8
1 1/2	2 7/8	4 1/4	5 3/4	7 1/8	8 5/8		11 1/2		14 3/8	15 3/4

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

TO FIGURE UNLISTED RISE TAKE 1/2 DIFFERENCE OF NUMBER OVER & NUMBER UNDER. EXAMPLE: 25" RISE 7" WIDTH. 8 1/2" TO 9" = 1/4". ADDED TO SMALLER NUMBER = 8 3/4".

Other building widths

The 33 to 40 ft chapter above is the bucket the inch-fraction tables were designed around. Smaller buildings have their own buckets in the heritage library: 3 to 14 ft for sheds and additions, 15 to 20 ft for typical room widths, 21 to 32 ft for standard home spans.