How To Support Cut Floor Joists

One rule of thumb is to provide twice the distance between holes as the diameter.

How to support cut floor joists.

The notching and boring rules of thumb for solid lumber are shown in fig. Structural floor joist repairs. 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. Making a jack post.

This helps the joist turn into the proper resting position. Codes don t directly address how many holes and notches you can cut in a joist. How do you support loads when a joist must be cut for plumbing. If your home is more than 20 years old your floor joists are most likely solid wood 2x8s 2x10s or 2x12s.

Even worse is that over time any rot or decay from moisture that these cut up joists see will result in a dangerous situation where if the job was done right the joists would be able to handle the load. This article provides step by step instructions and pictures on how to make structural repairs by sistering floor joists alongside weak joists. The idea behind this is pretty simple. This will create a weak spot.

Only a small section in the master bath is affected but it looks like i will have to pull the vanity cut out old sub flooring and figure out how to support that section of the floor where the toilet will rest once all the repairs are done tackitybits continues. As a remodeling contractor and carpenter one common structural framing issue i see alot of in bathroom remodeling jobs are floor joists that were cut drilled notched or need to be cut out to accommodate plumbing pipes and drains. I made a fast and simple jack post with two 2 4 screwed together. Sometimes joists are notched at the end where they bear on a wall or sill.

Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. If the new joist is hitting a beam and the floor above and jacking is not an option an alternative approach is to cut small bevels on the two opposing edges that the touch the beam and floor board. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor. If you have sagging cracked or twisted joists which can happen in older houses this project will provide the extra support the floor needs.