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Many times when I install the rake trim I will let the lower piece overlap the top piece so the laps disappear when you look up the rake. I know its against the water runs downhill rule of law but what I do is bead the back of the overlapping piece with clear Geocell, OSI or silicone to stop any little water that could possible get behind the trim.
I have seen that done before and there was a bunch of rotten fascia towards the bottom of the rake years later. Unless a client wanted to have it done and sign off on it I wouldn't worry about the overlap being seen when you look up the rake.

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I have seen that done before and there was a bunch of rotten fascia towards the bottom of the rake years later. Unless a client wanted to have it done and sign off on it I wouldn't worry about the overlap being seen when you look up the rake.

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They probably never took the time to seal the joint well with a quality sealant like Goecell.
 
No doubt geo is excellent stuff but im still sticking with the traditional way so water cant run in. Like overanalyze, id only do it the other way if client signed off.

I did however do some of the windows on that farm house starting with the heads and running the legs up to it. Only on the first floor under the wrap around porch and the second floor under the eaves where it was less than a foot below the soffit. Made for a much tighter miter(actually a cope) when looking up. Small dab of osi quad behind the joint. All the gable ends exposed to weather were done heads last and took more time fitting.
 
I see most of the water entering in at the top edge of the aluminum rake where it meets the roof. Most bends are just left flat at the top and just shy of the shingles. Capillary action off the roof edge will let water right in and it runs down the inside of the aluminum trim to the bottom. Lots of guys will do a small 1/2" 45 kick out bend at the top of the rake bend to touch up tight under the shingle overhang but water can still get past... Drip edge is not always used around here up rakes.
 
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