Catalog

Web Hole Guidelines

INTERNATIONAL BEAMS

IB MAX-CORE I-Joist top and bottom flanges must never be cut, notched, or otherwise modified. Holes in web should be cut with a sharp saw. For rectangular holes, avoid over-cutting the corners, as this can cause unnecessary stress concentrations. Slightly rounding the corners is recommended. Starting the rectangular hole by drilling a 1” diameter hole in each of the four corners and then making the cuts between the holes is another good method to minimize damage to the I-joist. DIAGRAM IBUC-TH1 — Typical Holes

* Refer to notes on this page.

Minimum distance from face of support to the center of hole.

3/4x Diameter

2x diameter of larger hole

TABLE IBC-AW1 Allowable Web Hole Sizes and Locations (Limit State Design)

40 psf Unfactored Live Load 15 psf Unfactored Dead Load (1 3/4” end bearings, 3 1/2” interior without bearing stiffeners) Minimum Distance from inside face of any support to center of webhole (Simple or Multi-span)

ROUND HOLE DIAMETER (INCHES) Joist Depth Series SAF 2 3

4 5

6

6 1/4

7

8

8 5/8

9 10

10 3/4

IB400 14’-1” 0’-7” 1’-9” 2’-11” 4’-3” 5’-7” 6’-0” IB600 15’-4” 1’-5” 2’-8” 3’-11” 5’-4” 7’-1” 7’-7”

9 1/2”

IB400 16’-1” 0’-7” 0’-8” 1’-4” 2’-6” 3’-9” 4’-1” 5’-1” 6’-6” 7’-9” IB600 18’-1” 0’-7” 1’-6” 2’-8” 3’-11” 5’-5”5’-10” 7’-1”8’-10” IB600 19’-11” 1’-9” 2’-11” 4’-2” 5’-5” 7’-0” 7’-5” 8’-8” IB900 20’-5”0’-7” 1’-4” 2’-10” 4’-4” 6’-0” 6’-5” 7’-8” 9’-6”

11 7/8”

14” IB400 17’-8”0’-7”0’-8” 1’-2” 2’-3” 3’-4”3’-7”4’-5”5’-7” 6’-4” 6’-10”8’-6” IB600 18’-1” 0’-7” 0’-8” 1’-9” 3’-1” 4’-5” 4’-9” 5’-10” 7’-7” 8’-8” IB600 21’-10” 1’-9” 3’-0” 4’-4” 5’-8” 7’-1” 7’-6” 8’-7” 10’-2” IB900 23’-2” 0’-8” 1’-11” 3’-2” 4’-6” 5’-10” 6’-3” 7’-3” 8’-9” 9’-10” 10’-7” 16” IB400 18’-1” 0’-7”0’-8” 0’-11” 1’-10” 2’-9” 3’-0” 3’-9” 5’-0” 5’-9” 6’-3” 7’-7” 8’-7” IB600 18’-1”0’-7”0’-8” 1’-4” 2’-8” 4’-1” 4’-5”5’-6”7’-0” 7’-11” 8’-6” IB600 22’-5” 2’-4” 3’-6” 4’-8” 5’-11” 7’-2” 7’-5” 8’-5” 9’-10”10’-10” IB900 24’-3” 0’-7” 1’-8” 3’-0” 4’-5” 5’-11” 6’-3” 7’-5” 8’-11” 9’-11” 10’-6”

RESIDENTIAL (40L + 15D)

TABLE IBC-AW2 Allowable Web Hole Sizes and Locations (Limit State Design)

50 psf Unfactored Live Load 35 psf Unfactored Dead Load (1 3/4” end bearings, 3 1/2” bearings with bearing stiffeners) Minimum Distance, D, from inside face of any support to center of web hole (Simple or Multi-span)

ROUND HOLE DIAMETER (INCHES) Joist Depth Series SAF 2 4

6

8

10 12

14

14 3/4

16

16 3/4

IB80

19’-0” 0’-7” 21’-6” 0’-7”

1’-0” 1’-7”

2’-7” 3’-4”

4’-3” 5’-2”

6’-0” 7’-1”

8’-0” 9’-1”

18”

IB900 IB800 IB900 IB900

21’-0” 0’-7” 1’-4”

2’-9” 4’-3” 5’-10” 7’-5” 9’-10”

20”

22’-6” 0’-7” 24’-6” 0’-7”

1’-1”

2’-9” 1’-6”

4’-5” 3’-1”

6’-3” 4’-8”

8’-1” 10’-5”

24” COMMERCIAL (50L + 35D)

0’-8”

6’-5”

8’-2” 8’-10”10’-2” 11’-2”

Jackson LUMBER & MILLWORK A

1.

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July 2026