Rotten Rafter Repair

[veedee]

Some of the rafters are rotten and not sitting completely straight, where the batten sit of the 1st and 2nd row of roof tiles

Is this a good way to deal with the rot?

1. Use multitool to cut out rot
2. Place a piece long piece of treated 2x4 besides the rafter and sister this in

If i do the above what screw or bolts are best?

Also, does the new 2x4 have to extend/go past the rot by a minimum distance?

 

[^woody^]

Soak the rot with a preservative. Nail a 500mm or so tile batten either side of the rafter.

 

[veedee]

Soak the rot with a preservative. Nail a 500mm or so tile batten either side of the rafter.

so no need to cut the wet rot? Leave it, soak it in preservative? Then screw some 2x1 batten on both sides of the rafter and call it a day?

can I ignore the fact that the rafter is not sitting completely straight? Normal housing movement?

 

[^woody^]

Wet rot stops once you remove the source of damp. The timber will then dry out and depending on the extent may harden back up or be a bit crumbly. You don't need to cut out and replace soft rotten timber, but brush off any loose stuff to help the preservative penetrate.

If any softness or crumbly timber is more than half the depth, then do a more involved repair with timber bolted or glued and screwed to the sides. Otherwise, battens will do, as all you need is something to take the laths. Of course if you find it easier to cut and fix some 4x2 or suchlike to the side, then do that - whatever is easiest.