Product Installation Details

Holes only in the middle third of span and middle third of beam depth. No holes in cantilevers.

• 3-1/2" beam depth — max hole diameter 3/4"
• 5-1/2" beam depth — max hole diameter 1-1/8"
• 7-1/4" beam depth — max hole diameter 1-1/2"
• Deeper beams — max hole diameter 2"
• Minimum horizontal spacing between holes = 2x the diameter of the largest hole
• Maximum 3 holes per span; holes should not be cut in cantilevers

Holes may be cut in PKI joist webs for wiring, plumbing, and mechanical systems without reducing floor depth — location, size, and spacing must comply with Table 5 and the rules below.

• Distance from support to hole center must comply with Table 5 (varies by joist depth, series, and hole diameter — confirm exact values per project)
• I-joist top and bottom flanges must NEVER be cut, notched, or otherwise modified
• Center field-cut holes on the web; max hole size = clear flange-to-flange distance minus 1/4", keeping a minimum 1/8" gap to either flange
• Square/rectangular hole sides must not exceed 3/4 of the max round hole diameter allowed at that location; multiple holes require spacing of at least 2x the largest hole's diameter
• Holes 1-1/2" or smaller are permitted anywhere in the web, including cantilevers; limit 3 maximum-size holes per span
• Cut with a sharp saw — never over-cut the web. For rectangular holes, drill a 1"-diameter hole at each corner first, then cut between them to avoid stress cracks

Taiga TechNote IJ09-108. Applies to PKI20 and PKI40 uniformly loaded joist members only.

• Subfloor sheathing fastened per local code — ensure both flanges are fastened
• No packing required between joists
• Not applicable to girder members — see PKI installation guide instead
• Subfloor joint must fall on the centerline of a single joist
• Use 2" nails to attach subfloor to joist @ 6" o.c.

Use screws and glue at the locations shown for a squeak-free installation.

• #8 x 2" screws at both flanges, adhesive at the web-to-block location
• Block extension matches distance between face of web and face of flange of the I-joist being attached to

Same detail as the I-joist version, sized for SCL blocking.

• #8 x 2-1/2" screws at both flanges (longer than the I-joist version), adhesive at the web-to-block location
• Block extension matches distance between face of web and face of flange
• O/C spacing as per plan

Use screws and glue at the locations shown to ensure a squeak-free installation.

• #8 x 2" screws at both flanges, adhesive at the web-to-block location
• Block extension matches distance between face of web and face of flange of the I-joist being attached to
• Attaches to I-joist, rimboard, or SCL blocking

For angles greater than 60° from perpendicular. Factored loads not to exceed 2,400 lbs.

• Simpson SDW22500 x5 structural screw
• Simpson LS70 field-skewable reinforcing angle
• 12" filler block each side, sized to joist type and depth

Loads not to exceed 2,400 lbs (factored).

• Simpson SDW22500 x3 structural screw
• Simpson L90 reinforcing angle at the corner

1/4" SCL shear blocking at the eave.

• Beveled bearing plate required when slope exceeds 1/4" per foot
• For RIS joists: attach joist to plate with a twist strap and backer block

1-1/2" x D" LSL fascia. Use nails and glue at the locations shown for a solid structural connection.

• 2x4 web stiffener on one side of joist
• 3" (10d) and 2" (6d) common nails
• 1-1/4" rim for blocking, V-notch for ventilation if required

1-3/4" x 11-7/8" LVL fascia. Use screws and glue at the locations shown for a solid structural connection.

• 2x4 web stiffener on each side of joist (both sides, vs. one side for the LSL/nailed version)
• "U2" #10 x 3-1/2" universal screws
• 1-1/4" rim for blocking with V-notch for ventilation

Strap length determined by overhang.

• MSTIxx (or equivalent) framing strap, fastened to back of ledger prior to installation
• Solid SCL ledger, joist blocking, rimboard
• Section view: 2x4 nailer, 1-3/4" LVL ledger, SST "LSSR" type hanger, continuous coil strap, web stiffeners each side, 1-1/4" structural rimboard