Replacing Rotted Roof Joists

A neat trick contractors do when dealing with dry rot is add another level to the floor joists.

Replacing rotted roof joists.

Keep in mind that the joist extends through the wall. However replacing the entire joist gives the home much better structural integrity. I used the same size board 2x6 and cut out one piece to replace the rotted piece. The joist plate is bolted to the timber making the joint b as strong as the original joist.

Slide one of the newly cut rafter legs into position directly next to the old rafter. Put it on both ends of the joists. Measure the dimensions of the old rafters beneath your roofing surface. Use your tape measure to record the distance of both rafter legs.

If you feel like the new joists you put in need more integrity you can add vertical boards. Different sizes are available to suit the joist section and the amount the joist will have to be cut back. These plates are a quick and neat solution for joist ends that aren t going to be seen. How to replace the rafters without removing the roof.

To repair a roof joist you will need to either replace the entire joist or use a spliced in piece of wood. I used 3 screws in this case i also put a nice little bit of glue between the new piece and the other joist for more gripping strength. The rotten timber should be removed first and the end of the joist treating to discourage any further rot. To eliminate the possibility of holes in between joists you can use wood glue affiliate link to amazon.