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One trick I have used in similar situations is to cut my new rough opening with my reciprocating saw completely though the sheathing and siding. I then cut the siding back (from the outside) with a circular saw about an inch and half or so (just enough to plumb/square and nail the flanges). After the window is completely set I then carefully measure 3-3/4″ all the way around the window & cut the siding back again wth the saw. This gives you enough room to insert j-channel behind the siding and to place 1×4 trim around the window that I then can cap with aluminum.
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One trick I have used in similar situations is to cut my new rough opening with my reciprocating saw completely though the sheathing and siding. I then cut the siding back (from the outside) with a circular saw about an inch and half or so (just enough to plumb/square and nail the flanges). After the window is completely set I then carefully measure 3-3/4" all the way around the window & cut the siding back again wth the saw. This gives you enough room to insert j-channel behind the siding and to place 1x4 trim around the window that I then can cap with aluminum.
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I will be installing a new window in a wall that has aluminum siding. Any tips on how to retro finish the old siding around the new window?
*You have to go to the aluminum siding place, (yuck) and get some of that j-bead lokin stuff which you can then slide up against your brickmold or other trim. You can use a drywall router to cut the aluminum back from the rough opening to accomodate the j-bead and your trim.