JOIST DIMENSIONS

DUCT SHAPES & ALLOWABLE SIZES

DEPTH

PANEL DISTANCE

ROUND (DIAMETER)

SQUARE

RECTANGULAR

10"

19"

6"

5"

6"x3"

12"

19"

7"

6"

7"x4"

14"

19"

8"

6"

9"x5"

16"

24"

9"

7"

13"x5"

18"

24"

10"

8"

13"x6"

20"

24"

11"

9"

13"x6"

 RESIDENTIAL

 COMMERCIAL

 Total load = 117 psf

 Total load = 157 psf

 Live Load = 40 psf

 Live Load = 80 psf

 NC Dead Load = 42 psf

 NC Dead Load = 42 psf

 Comp Dead Load = 35 psf

 Comp Dead Load = 35 psf

Depth

Length

Length

10"

25'-0"

25'-0"

12"

30'-0"

30'-0"

14"

35'-0"

32'-8"

16"

40'-0"

37'-4"

18"

45'-0"

39'-0"

20"

46'-8"

43'-4"

Notes:

 1.  Ecospan™ joists are typically spaced  at 4'-0" on center.

 2.  Shaded areas may require special chord or web members.

 3.  Tables assume 3" nominal 3000 psi concrete slab.