PROFESSIONAL
Charts & Tips
Span Charts
Allowable spans for spruce, pine and fir. by The U.S. Span Book for Major Lumber Species MAXIMUM ALLOWABLE SPAN (ft.-in.)
|
Spacing (in.)
|
2 x 6
|
2 x 8
|
2 x 10
|
2 x 12
|
|
Grades
|
Sel Str. |
No.1
No.2 |
No.3 |
Sel Str. |
No.1
No.2 |
No.3 |
Sel Str. |
No.1
No.2 |
No.3 |
Sel Str. |
No.1
No.2 |
No.3 |
| 12 |
10-6 |
10-3 |
8-8 |
13-10 |
13-6 |
11-0 |
17-8 |
17-3 |
13-5 |
21-6 |
20-7 |
15-7 |
| 16 |
9-6 |
9-4 |
7-6 |
12-7 |
12-3 |
9-6 |
16-0 |
15-5 |
11-8 |
19-6 |
17-10 |
13-6 |
| 19.2 |
9-0 |
8-9 |
6-10 |
11-10 |
11-6 |
8-8 |
15-1 |
14-1 |
10-7 |
18-4 |
16-3 |
12-4 |
| 24 |
8-4 |
8-1 |
6-2 |
11-0 |
10-3 |
7-9 |
14-0 |
12-7 |
9-6 |
17-0 |
14-7 |
11-0 |
Allowable spans for APA performance rated I-Joists by APA the Engineered Wood Association SIMPLE SPANS ON CENTER SPACING (ft.-in.)
| Depth |
Joist Designation |
12" |
16" |
19.2" |
24" |
| 9 1/2" |
PRI-20 |
16-7 |
15-2 |
14-4 |
12-9 |
| PRI-30 |
17-1 |
15-8 |
14-10 |
13-11 |
| PRI-40 |
18-0 |
16-6 |
15-7 |
14-1 |
| PRI-50 |
17-10 |
16-4 |
15-5 |
14-5 |
| PRI-60 |
19-0 |
17-4 |
16-4 |
15-4 |
| |
| 11 7/8" |
PRI-20 |
19-11 |
18-2 |
16-6 |
14-9 |
| PRI-30 |
20-6 |
18-9 |
17-9 |
16-7 |
| PRI-40 |
21-6 |
19-7 |
18-2 |
16-3 |
| PRI-50 |
21-4 |
19-6 |
18-5 |
17-3 |
| PRI-60 |
22-8 |
20-8 |
19-6 |
18-3 |
| PRI-80 |
24-11 |
22-8 |
21-4 |
19-11 |
| |
| 14" |
PRI-40 |
24-4 |
22-1 |
20-2 |
18-0 |
| PRI-50 |
24-4 |
22-3 |
21-0 |
19-8 |
| PRI-60 |
25-9 |
23-6 |
22-2 |
20-9 |
| PRI-70 |
26-1 |
23-10 |
22-6 |
21-0 |
| PRI-80 |
28-3 |
25-9 |
24-3 |
22-8 |
| |
| 16" |
PRI-40 |
27-0 |
24-0 |
21-11 |
19-7 |
| PRI-50 |
27-0 |
24-8 |
23-4 |
20-2 |
| PRI-60 |
28-7 |
26-1 |
24-7 |
23-0 |
| PRI-70 |
29-0 |
26-5 |
24-11 |
23-1 |
| PRI-80 |
31-4 |
28-6 |
26-11 |
25-1 |
For more information on Performance Rated I-Joists visit: APA website
Door Hinging & Rough Opening Information
Lumber Nominal & Actual Size Charts
Nails – Types, Uses & Sizes
Construction Calculators
http://www.findthelinks.com/construction/calculators_construction.htm
Trade Publications
Builder Online http://www.builderonline.com/
Jobsite Online http://www.jobsitemagazine.com/
Journal of Light Construction http://www.jlconline.com/cgi-bin/jlconline.storefront
NAHB Online Newsletter http://www.nbnnews.com/
Remodeling Online http://www.remodeling.hw.net/
Tools of the Trade Online http://www.toolsofthetrade.net/
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