Reinforcing Floor Joists For Plumbing

The new i joists should have plywood web stiffeners also.

Reinforcing floor joists for plumbing.

Remove a section of the hacked i joist add new i joist perpendicular on both sides of the plumbing pipe using hangers. From the top and the bottom if it s a dimensional lumber joist. Determine the size of your plumber box for a double header measure back three inches from your plumber box 3 is the width of a doubled header and mark a. Step 4 reinforce the floors you will have to use a very sturdy piece of wood or some steel plating to reinforce the floor joists.

These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling. Sometimes joists are notched at the end where they bear on a wall or sill. Steps to head off a floor joist determine the location of your plumbing drain. You can reinforce a notched joist that has not cracked by cutting two pieces of 3 4 inch plywood as wide as the joist depth and as long as the plywood sheet.

You should use steel joist hangers when you do this. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Use a circular saw to start the cut and finish with a. Plywood web stiffeners on both sides of the i joist on either side of the hacked one.

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Tack a beam under the sagging joists. Screwing a piece to the joist on each. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

Keep the hole at least 2 in. A steel plate can be used the same way. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. Jacking them up too fast may cause cracks in the walls and floors overhead.

Away from the top and bottom. Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. In this case you need to do the same first step of adding double joists on the first joists that are outside of the cut zone. While searching around for a solution i came upon a company called metwood which produces a line of floor joist hole reinforcer technologies which attach directly to the side of the floor joist and are pre engineered to distribute the joist load around the larger up to 4 hole.

Now it is time to use some wood and screw it into place on the original joist as well as the cross beam.