Notched Floor Joist Bottom

The home is balloon framed and it appears the notched joist here is used half under the bottom plate and half for the sub flooring.

Notched floor joist bottom. No end notches where the joist is supported greater than 1 4 the joist depth. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. When installing a new joist on a foundation wall you may need to notch the bottom edge so it. From the top and bottom edges of a joist.

Maximum hole size is one third of the joist depth. No holes closer than 2 inches to the top or bottom edge. 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. Technical bulletin tb 818 provides technical information for analyzing and repairing tji joists with side top flange notches when necessary if an existing notch does not meet the criteria of this technical bulletin please contact weyerhaeuser tech support.

Someone made the 2nd floor living space so they added new 10 deep joists the badly notched ones in the. The reason there is only access from one side is due to the fact that there is another joist 8 deep from when this was originally an attic rafter. The space between the beam and the floor boards above was 7 inches so i decided to use regular framing lumber and rip a 1 2 inch off the width of a 2 8 framing member. Both joists rest on concrete.

We never recommend notching joist flanges but small notches may be permissible in some situations based on joist span and loading. No holes closer than 2 inches to any other hole or notch. The wall is an exterior wall and there is a full 2 8 rim joist. Sometimes joists are notched at the end where they bear on a wall or sill.

A nominal 2 8 board measures 1 1 2 by 7 1 2 inches cutting the new joist. The maximum depth of a notch at the end of a joist where it rests on a wall or beam can t exceed one quarter of the joist depth. No notches in the middle 1 3 of the joist but holes are permitted here. Outermost underneath the un notched portion of the bottom plate.

The foundation i assume. Attaching a metal strap to the bottom edge of the joist can stabilize a notched joist increasing the tensile strength of the joist.