I currently have aluminum fascia installed on the front facing portion of the beams on my porch. The bottom and back facing portion of the beams are not covered and are just wood with peeling paint. I would like to cover everything using aluminum trim coil but I am not sure what the most common practice is to cover the beam in this situation. I would like to leave the existing fascia alone and just cover the bottom and back. I was thinking of bending a piece of trim coil into an L shape and letting the existing fascia overlap it. I am wondering if this is the most common practice or if there is a better way. See pictures below:
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