Maximum Hole Size In Engineered Floor Joist

For simple span 5 minimum uniformly loaded joists meeting the requirements of this guide one maximum size round hole may be located at the center of the joist span provided that no other holes occur in the joist.

Maximum hole size in engineered floor joist. Distances are based on the maximum uniform loads shown in this guide. They are located 3 away horizontally edge to edge from a larger hole. Web stiffeners shall be cut to fit between the flanges of the lp solidstart i joist leaving a minimum 1 8 gap 1 maximum. You can drill the holes anywhere along the length of the joist first photo.

With these factors the lightest joist will have a maximum span of 17 feet 8 inches. At locations of concentrated loads the stiffeners shall be installed tight to the top flange. Minimum applies to all holes except knockouts closely grouped round holes are. Refer to the hole chart on page 9 of the tji specifiers guide for uniformly loaded joists.

Engineered wood products ewp span and size charts for bci joists. At bearing locations the stiffeners shall be installed tight to the bottom flange. The maximum allowable diameter of a hole in any solid lumber joist is one third of the joist s depth. Often hole size can be increased and holes can be placed closer to bearing than shown on the chart based on actual design spans and loads.

Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. Permitted if the group perimeter meets requirements for round or square holes. Notches can t be deeper than one sixth of the joist depth. 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.

This is the most common as the typical span is 15 feet. In the case of your 2 10 joists the maximum diameter is 35 64 in. Diameter plenty big enough for running cable. The heaviest joist along with the above factors will span a maximum of 23 feet 8 inches.