Reinforcing Floor Joists For Plumbing

Jacking them up too fast may cause cracks in the walls and floors overhead.

Reinforcing floor joists for plumbing.

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. Then you will cross block with a double header on each side of the opening and then attach short joists that will run the distance to the headers at the opening. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. A steel plate can be used the same way. A day until they re level.

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. Remove a section of the hacked i joist add new i joist perpendicular on both sides of the plumbing pipe using hangers. The new i joists should have plywood web stiffeners also.

Away from the top and bottom. 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. From the top and the bottom if it s a dimensional lumber joist. Steps to head off a floor joist determine the location of your plumbing drain.

Use a circular saw to start the cut and finish with a. 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. You should use steel joist hangers when you do this. Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have.

Tack a beam under the sagging joists. 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. Screwing a piece to the joist on each. Keep the hole at least 2 in.

These joists may need reinforcin g to reduce bounciness sagging or excessive deflection in the floor or ceiling.