Need to know the correct way to install an aluminum clad window for a new residence.

The exterior walls are 2x6 studs with 7/16 OSB, then Tyvek, then 7/16 panel siding. The windows are then trimmed out with 1x3 boards over the siding.

Should the nail fin of the window be attached to the OSB, then apply Tyvek tape around the window, then put the siding over the nail fins and the 1x3 over the siding? In my opinion, this is the most weathertite installation.

I have a few windows where the framer was getting ahead of himself a little bit and is attaching the nailing fin to the panel siding, then putting tyvek tape over the nail fins and finally the 1x3 trim boards. This installation isn't totally wrong, but isn't totally right either. Should I tell the framer to take out the windows that are installed this way and install as in the preceeding paragraph?

The other issue with installing on top of the siding is that the jamb extension for these windows will not be the same as the windows that are in the brick veneer walls(2x6 stud, OSB,Tyvek, Brick).

Which way is standard practice for the industry??

 

Standard practice (at least around here) is to install the windows as soon as the Tyvek is in place. Simply cut the Tyvek corner to corner in the rough opening, fold the 4 flaps in, install the window, then cut off the excess Tyvek.