|
|
FLOOR JOISTS
Residential
Occupancies |
40# Live Load, 10#
Dead Load, 1/360 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
11-4 |
10-4 |
9-0 |
15-0 |
13-7 |
11-11 |
19-1 |
17-4 |
15-2 |
23-3 |
21-1 |
18-5 |
|
Larch |
No.
1 & Btr |
11-2 |
10-2 |
8-10 |
14-8 |
13-4 |
11-8 |
18-9 |
17-0 |
14-9 |
22-10 |
20-9 |
17-1 |
|
No.
1 |
10-11 |
9-11 |
8-8 |
14-5 |
13-1 |
11-0 |
18-5 |
16-5 |
13-5 |
22-0 |
19-1 |
15-7 |
|
No.
2 |
10-9 |
9-9 |
8-3 |
14-2 |
12-9 |
10-5 |
18-0 |
15-7 |
12-9 |
20-11 |
18-1 |
14-9 |
|
FLOOR JOISTS
Light Storage
|
125# Live Load, 10#
Dead Load, 1/360 |
|
Span (feet and inches) |
|
Species |
Grade |
2x8 |
2x10 |
2x12 |
2x14 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
10-3 |
9-4 |
8-1 |
13-1 |
11-10 |
10-0 |
15-11 |
14-3 |
11-7 |
18-4 |
15-11 |
13-0 |
|
Larch |
No.
1 & Btr |
10-1 |
9-0 |
7-4 |
12-8 |
11-0 |
8-11 |
14-8 |
12-9 |
10-5 |
16-5 |
14-3 |
11-7 |
|
No.
1 |
9-6 |
8-2 |
6-8 |
11-7 |
10-0 |
8-2 |
13-5 |
11-7 |
9-6 |
15-0 |
13-0 |
10-7 |
|
No.
2 |
9-0 |
7-9 |
6-4 |
11-0 |
9-6 |
7-9 |
12-9 |
11-0 |
9-0 |
14-3 |
12-4 |
10-1 |
| CEILING JOISTS
Ceilings where the roof slope is steeper than 3 in 12. |
20# Live Load, 10#
Dead Load, 1/240 |
|
Span (feet and inches) |
|
Species |
Grade |
2x4 |
2x6 |
2x8 |
2x10 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
10-5 |
9-6 |
8-3 |
16-4 |
14-11 |
13-0 |
21-7 |
19-7 |
17-2 |
27-6 |
25-0 |
21-3 |
|
Larch |
No.
1 & Btr |
10-3 |
9-4 |
8-1 |
16-1 |
14-7 |
12-3 |
21-2 |
19-1 |
15-7 |
26-10 |
23-3 |
19-0 |
|
No.
1 |
10-0 |
9-1 |
7-8 |
15-9 |
13-9 |
11-2 |
20-1 |
17-5 |
14-2 |
24-6 |
21-3 |
17-4 |
|
No.
2 |
9-10 |
8-11 |
7-3 |
15-0 |
13-0 |
10-8 |
19-1 |
16-6 |
13-6 |
23-3 |
20-2 |
16-5 |
Rafters
All
tables assume no snow loads and a 1.25 Duration of Load adjustment
has been applied.
| ROOF RAFTERS
Roof slope 3 in 12 or less. Light roof covering, no ceiling. |
20# Live Load, 10#
Dead Load, 1/240 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
16-4 |
14-11 |
13-0 |
21-7 |
19-7 |
17-2 |
27-6 |
25-0 |
21-10 |
33-6 |
30-5 |
26-7 |
|
Larch |
No.
1 & Btr |
16-1 |
14-7 |
12-9 |
21-2 |
19-3 |
16-10 |
27-1 |
24-7 |
21-3 |
32-11 |
29-11 |
24-8 |
|
No.
1 |
15-9 |
14-4 |
12-6 |
20-10 |
18-11 |
15-10 |
26-6 |
23-9 |
19-5 |
31-10 |
27-6 |
22-6 |
|
No.
2 |
15-6 |
14-1 |
11-11 |
20-5 |
18-5 |
15-1 |
26-0 |
22-6 |
18-5 |
30-2 |
26-1 |
21-4 |
| ROOF RAFTERS
Roof slope greater than 3 in 12; light roof covering; no ceiling.
|
20# Live Load, 7# Dead
Load, 1/180 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
18-0 |
16-4 |
14-4 |
23-9 |
21-7 |
18-10 |
30-4 |
27-6 |
24-1 |
36-10 |
33-6 |
29-0 |
|
Larch |
No.
1 & Btr |
17-8 |
16-1 |
14-1 |
23-4 |
21-2 |
18-4 |
29-9 |
27-1 |
22-5 |
36-2 |
31-10 |
25-11 |
|
No.
1 |
17-4 |
15-9 |
13-3 |
22-11 |
20-6 |
16-9 |
28-11 |
25-0 |
20-5 |
33-6 |
29-0 |
23-8 |
|
No.
2 |
17-0 |
15-4 |
12-6 |
22-5 |
19-5 |
15-10 |
27-5 |
23-9 |
19-5 |
31-10 |
27-6 |
22-6 |
| ROOF RAFTERS
Roof slope 3 in 12 or less. Heavy roof covering, no ceiling.
|
20# Live Load, 15#
Dead Load, 1/180 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
18-0 |
16-4 |
14-3 |
23-9 |
21-7 |
18-0 |
30-4 |
26-11 |
22-0 |
36-1 |
31-3 |
25-6 |
|
Larch |
No.
1 & Btr |
17-8 |
15-7 |
12-9 |
22-9 |
19-9 |
16-1 |
27-10 |
24-1 |
19-8 |
32-3 |
27-11 |
22-10 |
|
No.
1 |
16-5 |
14-3 |
11-7 |
20-9 |
18-0 |
14-8 |
25-5 |
22-0 |
17-11 |
29-5 |
25-6 |
20-10 |
|
No.
2 |
15-7 |
13-6 |
11-0 |
19-9 |
17-1 |
13-11 |
24-1 |
20-10 |
17-0 |
27-11 |
24-2 |
19-9 |
| ROOF RAFTERS
Roof slope 3 in 12 or less. Light roof covering.
Heavy roof
covering, no ceiling. OR Flat roof
or cathedral
ceiling with drywall finish.
|
20# Live Load, 15#
Dead Load, 1/240 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
16-4 |
14-11 |
13-0 |
21-7 |
19-7 |
17-2 |
27-6 |
25-0 |
21-10 |
33-6 |
30-5 |
25-6 |
|
Larch |
No.
1 & Btr |
16-1 |
14-7 |
12-9 |
21-2 |
19-3 |
16-1 |
27-1 |
24-1 |
19-8 |
32-3 |
27-11 |
22-10 |
|
No.
1 |
15-9 |
14-3 |
11-7 |
20-9 |
18-0 |
14-8 |
25-5 |
22-0 |
17-11 |
29-5 |
25-6 |
20-10 |
|
No.
2 |
15-6 |
13-6 |
11-0 |
19-9 |
17-1 |
13-11 |
24-1 |
20-10 |
17-0 |
27-6 |
23-10 |
19-6 |
| ROOF RAFTERS
Heavy roof covering; flat roof or cathedral ceiling with drywall
finish. |
20# Live Load, 25#
Dead Load, 1/240 |
|
Span (feet and inches) |
|
Species |
Grade |
2x6 |
2x8 |
2x10 |
2x12 |
|
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
12” oc |
16” oc |
24” oc |
|
Douglas
Fir |
Sel.
Struc. |
16-4 |
14-11 |
12-6 |
21-7 |
19-5 |
15-10 |
27-5 |
23-9 |
19-5 |
31-10 |
27-6 |
22-6 |
|
Larch |
No.
1 & Btr |
15-10 |
13-9 |
11-2 |
20-1 |
17-5 |
14-2 |
24-6 |
21-3 |
17-4 |
28-5 |
24-8 |
20-1 |
|
No.
1 |
14-6 |
12-6 |
10-3 |
18-4 |
15-10 |
12-11 |
22-5 |
19-5 |
15-10 |
25-11 |
22-6 |
18-4 |
|
No.
2 |
13-9 |
11-11 |
9-8 |
17-5 |
15-1 |
12-4 |
21-3 |
18-5 |
15-0 |
24-8 |
21-4 |
17-5 |
|
