Joist notching and drilling

Structure · Joists · printed page 54 (PDF page 55)

Book index entries

Drilling and Notching – of Joists Holes and Notches – in Joists Notching and Drilling Notching and Drilling in Joists Furnace – Joists Joists

Text in the illustration

maximum notch depth = 1/6 joist depth maximum notch length = 1/3 joist depth no notches in middle 1/3 of joist length notches allowed in top or bottom
maximum notch depth = 1/6 joist depth
maximum notch length = 1/3 joist depth
no notches in middle 1/3 of joist length
notches allowed in top or bottom
note:
joist notching only allowed at the top of the ends of the joists in Canada
floor framing
joist depth
effective joist depth
2" min
maximum hole diameter:
1/3 joist depth (USA)
1/4 joist depth (CAN)
maximum notch
depth at end of joist:
1/4 joist depth (USA)
1/3 joist depth (CAN)
maximum:
1/2 joist width (CAN)
foundation wall

Generated explanation

The illustration shows wood floor joists supported at a concrete foundation wall, with examples of drilled holes and top notches. Dimension arrows distinguish full joist depth from the effective depth remaining below a notch. Two drilled holes illustrate minimum 2-inch clearance from joist edges, with maximum hole diameters specified separately for the USA and Canada. An end notch is shown near the joist bearing, with limits on notch depth and length. Notes give general notch restrictions, prohibit notches in the middle third of the span, and identify a Canadian restriction limiting notching to the tops of joist ends.

Components

floor joists floor framing rim joist sill plate foundation wall joist notches drilled joist holes

Materials

wood concrete

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