Although I’ not a fan of vinyl siding, I’ve addressed this problem by cutting a scrap of alum coil stock, slipping the top under the bottom of the J and letting the bottom of the scrap lap over the nailing strip of the siding. Any leakage will find it’s way out the weep holes. You could use a scrap of vinyl or even felt but I just like using alum.
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Any pictures of that? I know I'm asking for too much, but I'm doing the same thing
-Thanx for the help, Lou
I do the same on new construction windows, bend a piece of aluminum like a L. The piece should be at least 6" wider than your window. 2 inches of aluminum sitting on the sill and 10" hanging down. Don't nail the 10" side to the house. When you get your siding ran up to the pan, cut the bottom of the pan off so it doesn't hang over the snap lock.
If the windows are already set then pull the nails out of the bottom flange and slide a piece of flat stock underneath the nail fin.
Doing J-channel right is also a big help in remodeling situations. I do have pictures of that if you want them.
Matt
I do the same as the other guys ,too, 'cept I use felt paper.
Install it under the window before the window gets installed and trim to the siding as you reach it.
Works good.