Andersen Windows Problem: Breeze Still Coming Thru

Hello:
Have just had a few Andersen Series 400 double hung tilt-wash Woodwright replacement windows installed.
As far as I could tell by watching, the Contractor "seemed" to do a quite good job installing them. Lots of care caulking, etc.
However, there is still a breeze coming thru on all of them, somewhere, around them.
Just about impossible to tell exactly from where, though.
Was wondering:
- have any of you folks had similar problems like this ?
- e.g., might it be due to the fact that there is a distinct gap where the bottom window fits into its frame (I'm not sure of the exact terminology), undoubtedly to allow the window to easily tilt without scraping. All the windows like this that I've seen at HD also have this gap.
However, there seems to be a good "baffle" and some kind of labyrinth vinyl weatherstripping behind the gap.
Am asking, as I'd sure like to learn what might be the problem, any similar history of this kind of thing happening, etc., prior to calling the contractor back and making a big fuss.
Any thoughts on would be most appreciated.
Thanks, Bob
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Call Anderson and complain , did you pay they guy, stop payment now. If the problem is the windows the Anderson rep will be free, if not it will be a small charge to see how much was done wrong. I had a bad install and the rep came out. For example sliding doors cannot be installed more than 1/8" out of Plumb, Level or Square or your warranty is void from day 1. It could be the hack installed yours so you have no warranty now and forever. Anderson will help they want their products to last. Did you buy the windows or did the installer, was he a Anderson rep. On my install al the windows on the whole house leaked then I called the company to find the cause, my mistake was waiting to long to stop pay on the check. The instaler sounds like a hack, call Anderson second, after you call your bank.
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wrote:

The exterior, right - with flashing?

It sounds like a draft to me. How thick is this wall/RO ? My exterior walls have 2X6 walls, plus...

I've had drafty windows due to an install. Remove the interior trim to find no jamb or RO insulation at all. Fixed and buttoned up.

Can the installer/boss daddy tell you if they insulated between the window frame and the RO? Before he trimmed the inside.
-- Oren
"If things get any worse, I'll have to ask you to stop helping me."
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