Uniform Load Span Charts

Although Uniform Load Span Charts are available on all engineered joist products, they actually contain very little beyond comparative data. For example, the charts below tell you how our products perform at their maximum spans for a given depth and spacing. However, the charts say nothing for how they perform under more typical loading and support conditions. Only a computer analysis can provide more exact performance data for a given condition. This is true of all engineered joist products on the market.

We also provide a description of floor loading terminology. For unusual loading and/or support conditions, consult our engineering department .




J-12 (11-7/8") Uniform Load Span Chart:

Loading... 50 (40- 5- 5) 55 (40-10- 5) 60 (40-10-10) 65 (40-15-10) 70 (40-20-10)
Spc 12.0" 24' - 0" L/589 24' - 0" L/589 24' - 0" L/589 24' - 0" L/589 24' - 0" L/589
13.7" 24' - 0" L/473 24' - 0" L/473 24' - 0" L/473 23' - 9" L/488 23' - 2" L/525
16.0" 23' - 1" L/455 23' - 1" L/455 23' - 1" L/455 22' - 6" L/490 22' - 0" L/526
19.2" 21' - 9" L/454 21' - 9" L/454 21' - 9" L/454 21' - 2" L/493 20' - 8" L/529
24.0" 20' - 5" L/461 20' - 5" L/461 20' - 0" L/465 18' - 0" L/640 16' - 0" L/876

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J-14 Uniform Load Span Chart:

Loading... 50 (40- 5- 5) 55 (40-10- 5) 60 (40-10-10) 65 (40-15-10) 70 (40-20-10)
Spc 12.0" 26' - 0" L/688 26' - 0" L/688 26' - 0" L/688 26' - 0" L/688 26' - 0" L/688
13.7" 26' - 0" L/601 26' - 0" L/601 26' - 0" L/601 26' - 0" L/601 26' - 0" L/601
16.0" 26' - 0" L/515 26' - 0" L/515 26' - 0" L/515 26' - 0" L/515 25' - 10" L/525
19.2" 25' - 7" L/450 25' - 7" L/450 25' - 7" L/450 24' - 10" L/491 24' - 5" L/539
24.0" 23' - 8" L/451 23' - 8" L/451 23' - 8" L/451 22' - 0" L/560 21' - 6" L/599

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J-16 Uniform Load Span Chart:

Loading... 50 (40- 5- 5) 55 (40-10- 5) 60 (40-10-10) 65 (40-15-10) 70 (40-20-10)
Spc 12.0" 28' - 0" L/731 28' - 0" L/731 28' - 0" L/731 28' - 0" L/731 28' - 0" L/731
13.7" 28' - 0" L/640 28' - 0" L/640 28' - 0" L/640 28' - 0" L/640 28' - 0" L/640
16.0" 28' - 0" L/549 28' - 0" L/549 28' - 0" L/549 28' - 0" L/549 27' - 9" L/564
19.2" 28' - 0" L/458 28' - 0" L/458 27' - 5" L/486 26' - 5" L/564 26' - 0" L/571
24.0" 26' - 0" L/456 26' - 0" L/456 26' - 0" L/456 25' - 5" L/489 23' - 8" L/599

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J-18 Uniform Load Span Chart:

Loading... 50 (40- 5- 5) 55 (40-10- 5) 60 (40-10-10) 65 (40-15-10) 70 (40-20-10)
Spc 12.0" 30' - 0" L/768 30' - 0" L/768 30' - 0" L/768 30' - 0" L/768 30' - 0" L/768
13.7" 30' - 0" L/671 30' - 0" L/671 30' - 0" L/671 30' - 0" L/671 30' - 0" L/671
16.0" 30' - 0" L/575 30' - 0" L/575 30' - 0" L/575 30' - 0" L/575 30' - 0" L/575
19.2" 30' - 0" L/479 30' - 0" L/479 29' - 10" L/488 28' - 11" L/534 27' - 2" L/641
24.0" 28' - 5" L/466 27' - 4" L/504 26' - 5" L/579 26' - 0" L/584 25' - 11" L/589

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Important Notes on Span Tables:


1. Spans are based on uniformly loaded joists and include allowances for repetitive use members.
2. Live loads of 40 psf assumed. Additional dead loads are due to various combinations of construction materials.
3. All TrimJoist™ products are cambered to compensate for dead load deflections. Do not install them upside-down.
4. Deflections shown assume a 3/4" rated subfloor that has been both glued and nailed.
5. Total deflections are limited to less than L/240 as required by code.
6. Indicated spans are full member length, including a minimum bearing width of 1.75-inches on each end.
7. TrimJoist™ products are designed for clear span applications only. Do not apply center supports, cantilevers, or concentrated loads without first consulting a TrimJoist™ representative for a free computer analysis.


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5146 Hwy 182 East, PO Box 2286, Columbus, MS 39704-2286
Phone: 800-844-8281 ~ Fax: 662-245-0040