Cutting Floor Joists For Plumbing

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.

Cutting floor joists for plumbing.

I jacked up straightened out the floor before gluing nailing and carriage bolting the new joist to the cut joist. Even worse is that over time any rot or decay from moisture that these cut up joists see. Holes anywhere in the web area of engineered i joists except within 6 in. Roger goes over the best practices and rules for notching and drilling holes in joists while filming our bathroom series.

One fix i did was to sister on new joists. Structural floor joist repairs. 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. Codes don t directly address how many holes and notches you can cut in a joist.

Sometimes joists are notched at the end where they bear on a wall or sill. It s important to calculate the siz. I ve also sistered on steel flat plate when i wasn t able to nail on a long enough replacement joist for example existing plumbing or electrical wires prevent you from getting a full. The maximum allowable diameter of a hole in any solid lumber joist is one third of.

How to cut the subfloor to access the floor joists for plumbing. The notching and boring rules of thumb for solid lumber are shown in fig. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. The worst thing is when new homes or poor remodeling jobs end up with joists that are cut to fit the pipes and no repairs are ever made.

Things might work out for a while but you will have a high likelihood that the floor will flex and your tile will crack. If your home is more than 20 years old your floor joists are most likely solid wood 2x8s 2x10s or 2x12s. Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. When it s time to remodel it s often also time to reroute plumbing or replace subflooring that may have become rotted or cracked.