Installing fascia boards on uneven roofline

Question

I am doing some repair work on an old shed. I cut back rotted rafter tails and installed new eave trim. I plan on adding drip edge and new asphalt shingles next. When I installed the eave trim, I nailed it in following the roof line edge. However, after I installed the eave trim I noticed that there is a noticeable bow to the bottom of the eave trim. I have considered keeping the trim level at the bottom and adding drip edge at the top to hide the uneven junction between the roofline and the top of the trim.
What is the proper way to handle installing eave trim on a roofline that slightly sags in the middle (i.e. 1-2" off in the center of the roofline)?

isherwood · Accepted Answer

You have a couple options, but only one will make it look truly right without creating an oddly-shaped fascia or a ski jump in your roof. You'll need to raise the rafter tails. They're likely low in the middle because either the wall is sagging or the rafters weren't cut or fit well to begin with.
I would examine how the rafters are fastened to the wall plate. If they're not locked down hard, cut some wood wedges and begin driving them in a little at a time. Set a carpenter's line across the roof edge to act as a guide, and work each rafter up until you have a straight line.
Once everything is in place, re-fasten the rafters in some reasonable way. Hurricane ties might do, or timber screws from above.

Installing fascia boards on uneven roofline

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