Georgia-Pacific Engineered Lumber Canada - Manual (Page 11)

11 JAN 2014
pA
ge
cANAdiAN iNstAllAtioN iNstructioNs georgiA-pAcific Wood products
web hole guidelines
typical holes
2x diameter
3/4x
diameter
See Note 15
Minimum Distance from Inside Face of Any Support to Center of Web Hole (Simple or Multi-span)
Holes in web should be cut with a sharp saw. For rectangular holes, avoid over-cutting the corners,
I-Joist top and bottom flanges must never be cut, notched, or otherwise modified.
as this can cause unnecessary stress concentrations. Slightly rounding the corners is recommended.
Starting the rectangular hole by drilling a one inch diameter hole in each of the four corners and then
making the cuts between the holes is another good method to minimize damage to I-joist.
NOTES:
1. Table may be used for I-joist spacing 24 inches on center or less.
2. Hole location distance is measured from inside face of supports to center of hole.
3. Distances in this table are based on uniformly loaded joists.
4. Joists with web hole location and / or sizes that fall outside the scope of this table
must be analyzed based on the actual hole size, joist spacing, span and loading condition.
The I-joist shear capacity at the location of the circular web hole is calculated using the
following equation: V(round hole) = Published Shear Value x [(Joist Depth -
Hole Diameter)/Joist Depth]. SAF = Span adjustment factor, used as defined below:
This table is based on I-joists being used at a span = SAF. If the I-joists are placed at less than
the SAF, the maximum distance from the centerline of the hole to the face of any support (D),
as given above may be reduced as follows:
D
reduced
= L
actual
/SAF x D
Where:
D
reduced
= Distance from the inside face of any support to center of hole, reduced for less
than maximum span applications (feet). The reduced distance must not be less than 6 inches
from the face of support to edge of hole
L
actual
= The actual measured span distance between the inside faces of supports (feet)
SAF = Span Adjustment Factor given in the table above
D = The minimum distance from the inside face of any support to center of hole given above.
The table is only applicable to cases where L
actual
≤ SAF.
5. I-joist top and bottom flanges must NEVER be cut, notched, or otherwise modified.
6. Whenever possible field-cut holes should be centered on the middle of the web.
7. The maximum size hole that can be cut into an I-joist web shall equal the clear distance
between the flanges of the I-joist minus 1/4 inch. A minimum of 1/8 inch should be maintained
between the top or bottom of the hole and the adjacent I-joist flange.
8. The sides of square holes or longest sides of rectangular holes should not exceed three
fourths of the diameter of the maximum round hole permitted at the location.
9. Where more than one hole is necessary, the distance between adjacent hole edges shall exceed
twice the diameter of the largest round hole, or twice the length of the longest side of the
longest rectangular hole, and each hole must be sized and located per the table above.
10. A knockout is not considered a hole and may be utilized anywhere it occurs and may be
ignored for purposes of calculating minimum distances between holes.
11. 1½ inch holes shall be permitted anywhere in a cantilevered section of an I-Joist. Holes of
greater size may be permitted subject to verification.
12. A 1½ inch hole can be placed anywhere in the web provided that it meets the
requirements of 9 above.
13. For joists with more than one span, use the longest span to determine hole location in
either span.
14. All holes shall be cut in a workman-like manner in accordance with the restrictions listed
above and as illustrated in figure above.
15. A group of round holes at approximately the same location shall be permitted if they meet
the requirements for a single round hole circumscribed around them.
16. Refer to design software for other hole sizes and locations.
Unfactored: 40 psf Live Load, 15 psf Dead Load (1¾" end bearings, 3½" interior without bearing stiffeners, see WI Joist maximum spans)
Round Hole Diameter (in.)
3 2 SAF 4 5 6 6¼ 7 8 8 5 /
8
9 10 10¾
I-Joist
Depth
I-Joist
Series
9½"
11 7 /
8
"
14"
16"
WI 40
WI 60
WI 80
WI 40
WI 60
WI 80
WI 40
WI 60
WI 80
WI 40
WI 60
WI 80 0'-7"
1'-5"
2'-5"
0'-7"
0'-7"
1'-9"
0'-7"
0'-7"
1'-9"
0'-7"
0'-7"
2'-4" 1'-9"
2'-8"
3'-8"
0'-8"
1'-6"
2'-11"
0'-8"
0'-8"
3'-0"
0'-8"
0'-8"
3'-6"
2'-11"
3'-11"
5'-0"
1'-4"
2'-8"
4'-2"
1'-2"
1'-9"
4'-4"
0'-11"
1'-4"
4'-8"
4'-3"
5'-4"
6'-7"
2'-6"
3'-11"
5'-5"
2'-3"
3'-1"
5'-8"
1'-10"
2'-8"
5'-11"
5'-7"
7'-1"
8'-5"
3'-9"
5'-5"
7'-0"
3'-4"
4'-5"
7'-1"
2'-9"
4'-1"
7'-2" 6'-0"
7'-7"
4'-1"
5'-10"
7'-5"
3'-7"
4'-9"
7'-6"
3'-0"
4'-5"
7'-5"
5'-1"
7'-1"
8'-8"
4'-5"
5'-10"
8'-7"
3'-9"
5'-6"
8'-5"
6'-6"
8'-10"
5'-7"
7'-7"
10'-2"
5'-0"
7'-0"
9'-10"
7'-9"
6'-4"
8'-8"
5'-9"
7'-11"
10'-10"
6'-10"
6'-3"
8'-6"
8'-6"
7'-7" 8'-7"
14'-1"
15'-4"
16'-9"
16'-1"
18'-1"
19'-11"
17'-8"
18'-1"
21'-10"
18'-1"
18'-1"
22'-5"
Minimum distance from face of support to the center of hole. See table below.
of larger hole
allowable web hole sizes and locations
Do not drill
or cut flanges.