TJI* FLOOR JOISTS

9.5" TJI/ 15DF, 25DF 9.5" TJI/Pro 150/ 250 (10 psf DL)
11 7/8" TJI/15DF, 25DF, 35DF, 55DF 9.5" TJI/Pro 150/ 250 (20 psf DL)
14" TJI/25DF, 35DF, 55DF 11 7/8" TJI/Pro 150/ 250/350/550 (10 psf DL)
16" TJI/25DF, 35DF, 55DF 11 7/8" TJI/Pro 150/ 250/350/550 (20 psf DL)
16" TJI/Pro 250/350/550 (10 psf DL) 14" TJI/Pro 250/350/550 (10 psf DL)
16" TJI/Pro 250/350/550 (20 psf DL) 14" TJI/Pro 250/350/550 (20 psf DL)

Notes:
1. * TJI is a registered trademark of Trus Joist MacMillan, a limited partnership, Boise, ID.
2. The TJI/DF series products will be phased out by the end of 1997 & will be replaced by the TJI/PRO series.
3. Spans shown in tables are clear distance between supports. Most restrictive of simple or multiple spans.
4. Floor sheathing assumed glue-nailed to joists. If nailed only, reduce joist span by   5".
5. For loading conditions not shown in the tables above, refer to PLF tables in Trus Joist MacMillan TJI/PRO manual.
6. For limitations, web stiffeners & other special requirements, consult with Trus Joist MacMillan literature.
7.
Dimensional sizes for TJI joists.

 


 











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9.5" TJI Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
9.5" TJI/15 DF @ 12" 18'-9" 17'-0"
    @ 16" 17'-2" 15'-6"
    @ 19.2" 16'-3" 14'-8"
    @ 24" 15'-1"

13'-7"

  TJI/25 DF @ 12" 19'-7" 17'-9"
    @ 16" 17'-11" 16'-2"
    @ 19.2" 16'-11" 15'-3"
    @ 24" 15'-9" 14'-2"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide & ICBO Research Report #NER 119.
2. Refer to the manufacturer's data for specifics, limitations and installations.


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11 7/8" TJI Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
11 7/8" TJI/15 DF @ 12" 22'-4" 20'-3"
    @ 16" 20'-5" 18'-5"
    @ 19.2" 18'-10" 17'-5"
    @ 24" 15'-1" 15'-1"
  TJI/25 DF @ 12" 23'-4" 21'-1"
    @ 16" 21'-4" 19'-3"
    @ 19.2" 20'-2" 18'-2"
    @ 24" 18'-4" 16'-11"
  TJI/35 DF @ 12" 25'-3" 22'-10"
    @ 16" 23'-0" 20'-9"
    @ 19.2" 21'-8" 19'-7"
    @ 24" 20'-2" 18'-2"
  TJI/55 DF @ 12" 28'-8" 25'-11"
    @ 16" 26'-1" 23'-7"
    @ 19.2" 24'-1" 22'-2"
    @ 24" 22'-10" 20'-7"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide & ICBO Research Report #NER 119.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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14" TJI Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling. 12 PSF DL @ TJI/55DF)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
14" TJI/25 DF @ 12" 26'-6" 24'-0"
    @ 16" 24'-2" 21'-10"
    @ 19.2" 22'-10" 20'-7"
    @ 24" 18'-4" 18'-4"
  TJI/35 DF @ 12" 28'-8" 25'-11"
    @ 16" 26'-1" 23'-7"
    @ 19.2" 24'-7" 22'-2"
    @ 24" 20'-10" 20'-8"
  TJI/55 DF @ 12" 32'-6" 29'-5"
    @ 16" 29'-7" 26'-9"
    @ 19.2" 27'-11" 25'-2"
    @ 24" 25'-11" 23'-4"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide & ICBO Research Report #NER 119.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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16" TJI Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling. 12 PSF DL @ TJI/55DF)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
16" TJI/25 DF @ 12" 29'-5" 26'-7"
    @ 16" 26'-10" 24'-3"
    @ 19.2" 22'-11" 22'-10"
    @ 24" 18'-4" 18'-4"
  TJI/35 DF @ 12" 31'-9" 28'-8"
    @ 16" 28'-11" 26'-1"
    @ 19.2" 26'-1" 24'-7"
    @ 24" 20'-10" 20'-10"
  TJI/55 DF @ 12" 36'-0" 32'-6"
    @ 16" 32'-9" 29'-7"
    @ 19.2" 30'-10" 27'-10"
    @ 24" 26'-9" 25'-10"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide & ICBO Research Report #NER 119.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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9.5" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
9.5" 150 @ 12" 18'-8" 16'-11"
    @ 16" 17'-1" 15'-5"
    @ 19.2" 16'-2" 14'-7"
    @ 24" 14'-11"

13'-7"

  250 @ 12" 19'-6" 17'-8"
    @ 16" 17'-10" 16'-1"
    @ 19.2" 16'-10" 15'-2"
    @ 24" 15'-8" 14'-2"

Notes:
1. Ref: Trus Joist MacMillan.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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9.5" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 20 psf DL. Example: 1-layer of glue-nailed sheathing, 1" lightweight concrete & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
9.5" 150 @ 12" 18'-8" 16'-11"
    @ 16" 16'-8" 15'-5"
    @ 19.2" 15'-3" 14'-7"
    @ 24" 12'-6"

12'-6"

  250 @ 12" 19'-6" 17'-8"
    @ 16" 17'-10" 16'-1"
    @ 19.2" 16'-6" 15'-2"
    @ 24" 13'-5" 13'-5"

Notes:
1. Ref: Trus Joist MacMillan.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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11 7/8" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
11 7/8" 150 @ 12" 22'-3" 20'-1"
    @ 16" 20'-4" 18'-4"
    @ 19.2" 18'-10" 17'-4"
    @ 24" 15'-0" 15'-0"
  250 @ 12" 23'-3" 21'-0"
    @ 16" 21'-3" 19'-2"
    @ 19.2" 20'-0" 18'-1"
    @ 24" 18'-8" 16'-10"
  350 @ 12" 24'-10" 22'-5"
    @ 16" 22'-8" 20'-5"
    @ 19.2" 21'-4" 19'-3"
    @ 24" 19'-11" 17'-11"
  550 @ 12" 28'-2" 25'-6"
    @ 16" 25'-8" 23'-2"
    @ 19.2" 24'-2" 21'-10"
    @ 24" 22'-6" 20'-3"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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11 7/8" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 20 psf DL. Example: 1-layer of glue-nailed sheathing. 1" of lightweight concrete & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
11 7/8" 150 @ 12" 22'-3" 20'-1"
    @ 16" 18'-10" 18'-4"
    @ 19.2" 15'-8" 15'-8"
    @ 24" 12'-6" 12'-6"
  250 @ 12" 23'-3" 21'-0"
    @ 16" 20'-11" 19'-2"
    @ 19.2" 19'-1" 18'-1"
    @ 24" 15'-9" 15'-9"
  350 @ 12" 24'-10" 22'-5"
    @ 16" 22'-8" 20'-5"
    @ 19.2" 20'-8" 19'-3"
    @ 24" 17'-9" 17'-9"
  550 @ 12" 27'-10" 25'-6"
    @ 16" 25'-4" 23'-2"
    @ 19.2" 23'-11" 21'-10"
    @ 24" 22'-3" 20'-3"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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14" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
14" 250 @ 12" 26'-5" 23'-10"
    @ 16" 24'-1" 21'-9"
    @ 19.2" 22'-9" 20'-6"
    @ 24" 18'-11" 18'-11"
  350 @ 12" 28'-2" 25'-6"
    @ 16" 25'-8" 23'-2"
    @ 19.2" 24'-3" 21'-10"
    @ 24" 21'-4" 20'-4"
  550 @ 12" 32'-0" 28'-11"
    @ 16" 29'-1" 26'-3"
    @ 19.2" 27'-5" 24'-9"
    @ 24" 25'-6" 23'-0"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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14" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 20 psf DL. Example: 1-layer of glue-nailed sheathing, 1" of lightweight concrete & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
14" 250 @ 12" 26'-5" 23'-10"
    @ 16" 23'-2" 21'-9"
    @ 19.2" 19'-9" 19'-9"
    @ 24" 15'-9" 15'-9"
  350 @ 12" 28'-2" 25'-6"
    @ 16" 25'-1" 23'-2"
    @ 19.2" 22'-2" 21'-10"
    @ 24" 17'-9" 17'-9"
  550 @ 12" 31'-7" 28'-11"
    @ 16" 28'-9" 26'-3"
    @ 19.2" 27'-1" 24'-9"
    @ 24" 22'-5" 22'-5"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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16" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 10 psf DL. Example: 1-layer of glue-nailed sheathing & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
16" 250 @ 12" 29'-3" 26'-5"
    @ 16" 26'-8" 24'-1"
    @ 19.2" 23'-8" 22'-9"
    @ 24" 18'-11" 18'-11"
  350 @ 12" 31'-2" 28'-2"
    @ 16" 28'-5" 25'-8"
    @ 19.2" 26'-8" 24'-2"
    @ 24" 21'-4" 21'-4"
  550 @ 12" 35'-5" 32'-0"
    @ 16" 32'-3" 29'-1"
    @ 19.2" 30'-4" 27'-5"
    @ 24" 26'-9" 25'-5"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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16" TJI/PRO Residential Floor Joists Allowable Spans
(40 psf LL, 20 psf DL. Example: 1-layer of glue-nailed sheathing, 1" of lightweight concrete & direct-applied Gyp. Board ceiling)

Joist Depth Joist Series Spacing, o.c. L/360 LL Deflection (Code min.) L/480 LL Deflection (Recommended)
16" 250 @ 12" 28'-11" 26'-5"
    @ 16" 23'-8" 23'-8"
    @ 19.2" 19'-9" 19'-9"
    @ 24" 15'-9" 15'-9"
  350 @ 12" 31'-2" 28'-2"
    @ 16" 26'-8" 25'-8"
    @ 19.2" 22'-2" 22'-2"
    @ 24" 17'-9" 17'-9"
  550 @ 12" 35'-0" 32'-0"
    @ 16" 31'-10" 29'-1"
    @ 19.2" 28'-1" 27'-5"
    @ 24" 22'-5" 22'-5"

Notes:
1. Ref: Trus Joist MacMillan, Specifier's Guide.
2. Refer to the manufacturer's data for specifics, limitations and installations.

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