Wood "I" joist notching and drilling

Structure · Subflooring · printed page 56 (PDF page 57)

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Wood “I” Joist Notching and Drilling

Text in the illustration

D1 D2 2 x D2 minimum 1/8" minimum each manufacturer has its own rules for the minimum distance between support and holes typically, two inch diameter holes may be drilled mid-height at two feet or more from a support larger holes should be as close as possible to the center of the span holes may be round or square mid-span I-joist flanges should not be notched, either fully or partially support reinforcement should not have holes or notches use prepunched knockouts, if provided distance from support holes should be centered Wood "I" joist notching and drilling
use prepunched knockouts, if provided
D1
D2
2 x D2 minimum
1/8" minimum
distance from support
holes should be centered
mid-span
I-joist flanges should not be notched, either fully or partially
support
reinforcement should not have holes or notches
each manufacturer has its own rules for the minimum distance between support and holes
typically, two inch diameter holes may be drilled mid-height at two feet or more from a support
larger holes should be as close as possible to the center of the span
holes may be round or square

Generated explanation

The illustration shows a wood I-joist extending from a support toward mid-span, with upper and lower flanges and holes through the web. Holes are located along the web centerline, with dimensions identifying minimum hole spacing and clearance from a flange. Notes direct users to manufacturer-specific support clearances, prepunched knockouts where provided, and placement of larger holes near mid-span. Circled partial and full notches in the lower flange illustrate prohibited alterations. A separate inset shows end reinforcement with a warning against holes or notches in that reinforcement.

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