Boring And Notching Floor Joists

Notching and boring of joists and rafters section 91 2308 8 2 joists 91 2308 10 4 2 rafters b notches at the ends of joists or rafters shall not exceed one fourth the depth.

Boring and notching floor joists.

For cutting notching and boring trusses and manufactured lumber such as laminated veneer lumber the manufacturer s installation constructions. R502 8 drilling and notching. Away from the ends of a joist the notch must be no more than 1 6 of the joist s depth. The rules for boring and notching of engineered joists can vary slightly and are determined by the manufacturer.

Holes bored in joists shall not be within 2 inches 51 mm of the top or bottom of the joist and the diameter of any such hole shall not exceed one third the depth of the joist. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. Notching and boring of joists and rafters section 91 2308 4 2 4 joists 91 2308 7 4 rafters section r502 8 joists section r802 7 1 rafters notches at the ends of joists or rafters shall not exceed one fourth the depth. The below graphic courtesy of the journal of light construction shows what sizing and where holes and notches may exist in structural joists.

Engineered joists consist of solid top and bottom wood plates with a vertical plywood like component in the center. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for. Holes bored in the joists or rafters shall not be within 2 inches of the.

Notches in the top or bottom of joists shall not exceed one sixth the depth and shall not be located in the middle third of the span. Roger goes over the best practices and rules for notching and drilling holes in joists while filming our bathroom series it s important to calculate the size. Trus joist tji joist specifier s guide tj 4000 july 2019. Guide to notching and boring joists.

The rules for boring and notching of engineered joists can vary slightly and are determined by the manufacturer. Joists shall not exceed one fourth the joist depth. Holes bored in the joists or rafters shall not be within 2 inches of the top or bottom and the diameter of any such hole. The purpose of this handout is to provide the details for notching and boring wood studs joists and plates.

Joist depth notches allowed within 1 3 span at each end bored holes allowed within middle third of span but notches not permitted bored holes allowed within 1 3 span at each end but no closer than 2 to any other notch or hole stud wall see page 2 a notch not exceeding 1 3 the depth of the member is permitted in the top of a rafter or ceiling joist not further from the face of the support than the depth of the member.