Replacing Rotted Roof Joists

Put the new piece of wood in using screws that are twice as long as the thickness of the new wood.

Replacing rotted roof joists.

Measure the dimensions of the old rafters beneath your roofing surface. A neat trick contractors do when dealing with dry rot is add another level to the floor joists. I used the same size board 2x6 and cut out one piece to replace the rotted piece. Slide one of the newly cut rafter legs into position directly next to the old rafter.

These plates are a quick and neat solution for joist ends that aren t going to be seen. Put it on both ends of the joists. However replacing the entire joist gives the home much better structural integrity. Different sizes are available to suit the joist section and the amount the joist will have to be cut back.

The rotten timber should be removed first and the end of the joist treating to discourage any further rot. 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. To repair a roof joist you will need to either replace the entire joist or use a spliced in piece of wood. To replace the joist you need to measure the entire length.

To eliminate the possibility of holes in between joists you can use wood glue affiliate link to amazon. The joist plate is bolted to the timber making the joint b as strong as the original joist. How to replace the rafters without removing the roof. Use your tape measure to record the distance of both rafter legs.