Rotten Roof Joists

Pressure treated stuff won t let the water flow through the wood as well as straight regular wood.

Rotten roof joists.

Why i didn t choose a scarf joint joist repair a few reasons added up. This will make sure that dry rot that isn t visible won t sneak up on you. The best thing to do is mark your joists that are to be removed. There s lots of different methods for repairing or replacing rotten joists but the one we decided to go with was to install wall plate.

You want to cut about 6 inches past where the rot ends just to make sure no more moisture will get through. Rotted wood rafters in a roof are a serious issue. Just to be safe we re going to cut the joists at least 4 inches away from the rotten spots. Then just cut off the marked joists.

The rotten joist end is cut off and an angle cut is made to bottom of the beam to allow a new part to be bolted on a good distance from the fulcrum point. Wood rotting from the inside out compromises the structural integrity of the rafter. Basically the idea is to cut the ends off and affix a new piece of timber to the wall. Commonly what you can see of the rotted wood is only part of the problem it is what you cannot see under the surface of the wood that can be the main issue.

It means removing quite a bit of timber that isn t rotten including the edge moulding. Cut the rotten spot out. This part can be a little hard depending on what wood you are working with.