You cannot prescriptively splice a rafter

[jar546]

Although some have tried.

View attachment 1848

View attachment 1848

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[Mark K]

Agree with jar546. It is not easy even for engineers if there is any significant load on the rafters.

 

[Daddy-0-]

You cannot prescriptively splice a rafter

Unless over a wall of course.

 

[kilitact]

Use a structural member

 

[Rio]

Sister it to the existing rafter.

 

[Uncle Bob]

Requires engineering. Now days they just use fingerjointed lumber for rafters and joists. Construction is going down hill.