Andersen makes only new construction windows. They have the mounting
flange that is supposed to be under the exterior siding. However, I
have installed a few with the flange on the outside of the house with a
few 1x3 or 1x4 sticks to cover the flange. On the inside, I make my
own jamb extenders out of 1/2" plywood. This is mostly covered by the
interior case molding. With adequate caulking and "Great Stuff" it all
looks fine and is weather proof.
That being said, I do have problems with Andersen quality. It seems to
vary over time. I have two supposedly identical large bay windows
which were bought 7 years apart in time. The more recent one had gouges
in the seat board, half the screws that held the crank mechanism in were
missing. The window closers were plastic instead of metal on the
earlier units. But when I finish replacing the windows, I would like
them to be all from the same supplier. (Only 4 left to do)
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