Drilling Holes In Lvl Floor Joists

No holes in headers or beams in plank orientation.

Drilling holes in lvl floor joists. Vertical holes whenever possible avoid drilling vertical holes through lvl beams unless the beam width is at least 3 1 2 inches. Keep the hole at least 2 in. No holes in cantilevers. Leave at least 1 4 in.

Minimum applies to all holes except knockouts closely grouped round holes are. You can drill the holes anywhere along the length. The diameter of holes shall not be greater than 1 3 the depth of the floor joists. 36 ilevel trus joist beam header and column specifier s guide tj 9000 november 2006 other ilevel trus joist headers and beams round holes only.

Diameter plenty big enough for running cable. Ib lvl beam round hole s per table 1 3 span 1 3 depth 1 3 depth 1 3 depth middle 1 3 span allowable hole zone 1 3 span allowable hole zone beam maximum round. Hole do not notch drill or cut ib lv l except as shown in this publication. General notes general notes allowed hole zone suitable for uniformly loaded headers and beams only.

For example a maximum 11 hole can be cut in a 14 deep tji joist. For a 2 10 where actual depth is 9 25 inches the maximum allowable hole diameter would be just over three inches. From the top and the bottom if it s a dimensional lumber joist. Maximum hole size is one third of the joist depth.

If you have manufactured floor joists you will want to consult the particular manufacturer s literature. In contrast large holes can be cut into the webs of tji joists. Allowable horizontal holes in ib lvl minimum clear distance between holes 2 x diameter of the larger hole. Or the amount specified by the manufacturer of web between the edge of the hole and the flange.

For 1 55e timberstrand lsl a maximum 4 5 8 diameter hole for members 14 16 deep is permitted see tj 9000 tj 9020 tj 9500 tj 9505 for additional information. The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1 4 in is 3 3 4 in. Minimum distance from table b 1 round holes may be cut anywhere in web outside of hatched zone if. Permitted if the group perimeter meets.

Trus joist tji joists. Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists. Drill large holes toward the center of i beam joists not toward the ends. Holes cannot be closer than 2 to.

Prior to drilling any vertical holes an engineer or architect qualified in wood design should be consulted. Holes must be at least 2 in.