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Fascia(rafter)plumb-cut Angle: Run=14' 5-1/2, Can You Help?

I am trying to determine angle to set miter saw at to make cut in new fascia board. Thanks for your help. I don't have contractor's calculator.

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    What pitch are you trying to achieve? Fascia boards don't get mitered cuts.  the rake ( on the gabble ends) will be set to the same pitch as the roof. Get a speed square, mark your lines and cut it with the miter saw. Use your speed square on the sheathing of the roof and bring your fascia board up against the speed square and nail it. Drip edge will go over the fascia and sheathing to cover factory edge. Unless you have some fancy woodwork, I've never heard of anyone mitering the fascia to match the pitch of the roof.
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    I'm not trying to achieve any particular pitch; I'm hoping to find the angle of the the plumb-line cut I would need to make on each of the two fascia boards where they will meet flush just under the peak of the roof. I understand the fascia will slip in under the drip edge. I don't need to make any compound miter cut or any other tricky cut where the ends meet; it will be a 90 deg. Vertical cut at the end of the horizontal 1 x 10. I don't have access to a contractor's calculator or a speed square, but I can sure see the need for them. Thank you.
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    Newbie here: My screen showing the original question I asked omits the rise I thought I included in it. The rise is 3' 9-3/4". I already knew the length of the old fascia board thus the new one as well. Sorry.
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    Ok, your plumb cuts will be the same as the pitch of the roof. And those boards are the rake not facia. Whats the pitch of your roof? Ex: 3, 5, 6 12.
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      Tack a scrap board in place and either scribe against your eave side fascia or rafter tail or use a short "torpedo" level to get your true plumb cut. This should be the same angle as at the ridge cut. You could also use a simple sliding T-bevel against the fascia. Look up "roof framing 101".
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