In my old house, there is a beam that has rotted due to water leakage from the roof. The beam, approximately 13x13 cm, serves as a tie beam with roof rafters resting on it. It spans about 20 cm, but it has been supported with upright studs. I want to remove the rotten part and splice in new fresh timber that I bought and then screw it with French wood screws. I'm thinking of a lap joint ("half-and-half") on the height if you understand what I mean.

What do you think about splicing in like this?

Considering that it lies at the seam between the wall and the roof, it's quite cramped. What kind of tool should one use to do this a bit quickly? I would prefer not to chisel with a chisel.

Can the Fein Multimaster with a blade that can saw right into the material help, does it have the capacity for such a heavy job?
 
Don't forget to glue as well
 
magnu said:
Don't forget to glue as well
I didn't think at all that you have to glue. How important is it?
Because I think it will be difficult to get flat parallel surfaces, which are probably needed for the glue to be of any significant use.
 
Hello

I probably don't have the complete picture in my mind, but if it looks as I believe, I would do the following...
1. Properly bracing the rafters (if it's not already done).
2. Expose the wall plate over a stretch so you overlap at least three vertical studs.
3. Cut the existing wall plate.
4. Splice according to half-lap or according to the attached sketch.

Regards, Wasa
 
  • Diagram showing overlap joints for a new wall plate ("nytt hammarband") connecting with vertical beams for construction support.
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Hello

It looks almost exactly like you sketched. What does it say by the arrows?
 
joint patch
 
Do you mean attaching board scraps or plywood pieces above and below for a straight joint?
 
Yep, 45x120
 
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