Georgia-Pacific Engineered Lumber - Manual (Page 5)

web Holes
Never drill, cut or notch the flange, or over-cut the web.
Holes in webs should be cut with a sharp saw or drill bit, not by
hammering (except at knockouts.)
For rectangular holes, avoid over cutting the corners, as this can
cause unnecessary stress concentrations. Slightly rounding the
corners is recommended. Start the rectangular hole by drilling a
1( diameter hole in each of the four corners and then make the
cuts between the holes to minimize damage to I-joist.
wood I beam ™ Hole table (Simple or multiple Span)
Table dimension is minimum distance from inside face of support to nearest edge of hole.
NOTES
1. Hole locations are based on worst case of simple and multiple span
conditions with uniform floor loads of 40 PSF live load and 10 or 20 PSF
dead load, and spans in this guide.
2. Small holes not greater than 1.59 in diameter can be placed anywhere
in the web, but each hole must be spaced a minimum horizontal clear
distance of 2 times its diameter (but not less than 19) from any adjacent
hole. No more than two small holes can be placed next to each other
and/or adjacent to larger holes following the guidelines in this note.
More than one group of small holes is permitted on a joist, but adjacent
groups must be spaced a minimum horizontal clear distance of 129.
3. For holes greater than 1.59 diameter, minimum clear distance between
a) two round holes is 2 times the diameter of the larger hole
b) a round hole and a rectangular hole is the larger of 2 times the hole
diameter or twice the rectangular hole width
4. For rectangular holes, the longest side may not exceed 75% of a round
hole diameter permitted at that location; i.e., if an 8 inch round hole is
permitted, the longest side of a rectangular hole centered at that
location is 89 x 0.75 = 69.
5. 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.
6. For joists with more than one span, use the longest span to determine
hole location in either span. For large differences in adjacent span
lengths, use FASTBeam
® software.
7. All holes shown on this table may be located vertically anywhere within
the web; a clear distance of at least 1 ⁄
8 9 must be maintained from the hole
edge to the inner surface of the closest flange.
8. For other conditions use FASTBeam software. Analysis using FASTBeam
software could permit larger holes, or holes closer to the supports than
shown in this table.
EXAMPLE:
Determine the allowable location of a 99 round hole in a 149 deep joist
which spans 208.
Enter the table in the left column and find 149 joist depth, move to the right
and find 208 in the joist span column and move across the table to intersect
the 99 round hole column. The nearest allowable location to either bearing
is 68-99.
Round Hole Diameter
29 39 49 59 6 1 ⁄
4 9 79 89 8 5 ⁄
8 9 99 109 10 3 ⁄
4 9 119 129 12 3 ⁄
4 9
Do not drill or cut flanges.
kf
See
note 5
Table
dimension
Table
dimension
See
note 3
08-6( 08-6( 08-9( 18-9( 38-3(
08-6( 18-3( 28-3( 38-3( 48-6(
18-0( 28-0( 38-0( 48-3( 58-9(
08-6( 08-6( 28-0( 38-6( 58-9(
08-6( 08-6( 08-9( 28-6( 58-0(
08-6( 08-6( 08-9( 18-0( 18-9( 28-6( 38-9( 48-6(
08-6( 08-6( 08-9( 18-9( 38-3( 48-0( 58-3( 68-0(
08-6( 18-3( 28-3’’ 38-3( 48-6( 58-6( 68-6( 78-6(
18-6( 28-6( 38-6( 48-6( 68-0( 68-9( 88-0(
08-9( 28-0( 38-3( 48-6( 68-3( 78-3( 88-9(
18-6( 28-9( 48-0( 58-6( 78-3( 88-3( 98-9(
08-6( 18-9( 38-3( 48-9( 78-0( 88-3( 108-0( 118-3(
08-6( 08-6( 08-9( 18-0( 18-0( 18-0( 18-3( 28-0( 28-3( 38-6( 48-3(
08-6( 08-6( 08-9( 18-0( 18-0( 18-6( 28-6( 38-3( 38-9( 48-9( 58-9(
08-6( 08-6( 08-9( 18-0( 28-0( 28-9( 48-0( 48-9( 58-0( 68-3( 78-3(
08-6( 0’-6( 18-0( 28-0( 38-3( 48-3( 58-3( 68-0( 68-6( 78-9(
08-6( 08-6( 08-9( 18-6( 38-0( 48-0( 58-3( 68-3( 68-9( 88-6(
08-6( 08-6( 18-6( 28-9( 48-3( 58-6( 68-9( 78-9( 88-3( 108-0(
08-6( 18-0( 28-3( 38-6( 58-3( 68-3( 78-9( 88-9( 98-3( 108-9(
08-6( 08-6( 18-0( 28-6( 48-6( 58-9( 78-6( 88-6( 98-3( 11’-3(
08-6( 08-9( 28-3( 38-9( 58-9( 78-0( 88-9( 108-0( 108-6( 128-6(
08-6( 08-6( 08-9( 18-0( 18-0( 18-0( 18-0( 18-0( 18-3( 28-6( 38-3( 38-6( 48-9( 58-9(
08-6( 08-6( 08-9( 18-0( 18-0( 18-0( 18-6( 28-3( 28-9( 38-9( 48-6( 58-0( 68-3( 78-0(
08-6( 08-6( 08-9( 18-0( 18-0( 28-0( 38-0( 38-6( 48-0( 58-3( 68-0( 68-3( 78-6(
08-6( 08-6( 08-9( 18-0( 18-0( 18-6( 28-9( 38-6( 48-0( 58-3( 68-3( 68-9( 88-3(
08-6( 08-6( 08-9( 18-0( 18-9( 28-9( 48-0( 48-9( 58-3( 68-9( 78-9( 88-3( 98-9(
08-6( 08-6( 08-9( 18-0( 28-6( 38-6( 48-9( 58-6( 68-3( 78-6( 88-9( 98-0( 108-9(
08-6( 08-6( 08-9( 18-0( 28-0( 38-0( 48-6( 58-6( 68-3( 88-0( 98-3( 98-9( 118-9(
08-6( 08-6( 08-9( 18-0( 28-6( 38-6( 58-3( 68-3( 78-0( 88-9( 108-3( 108-9( 128-9(
08-6( 08-6( 08-9( 18-9( 38-9( 58-0( 68-6( 78-6( 88-3( 108-0( 118-6( 118-9( 138-9(
08-6( 08-6( 08-9( 18-0( 28-3( 38-6( 58-6( 68-9( 78-6( 98-6( 118-0( 118-6( 138-9(
Joist Joist
Depth Clear Span
108
128
9 1 ⁄
2 9 148
168
188
128
148
168
11 7 ⁄
8 9 188
208
228
248
128
148
168
188
149 208
228
248
268
288
148
168
188
208
169 228
248
268
288
308
328
Example below
Installation Guide