Your best option might be to contact a few of your local glass shops and tell them that you have IG seal failure and ask them about replacement IG units.

You probably don't want to do this as DIY I assume, so i would suggest that you get several quotes for the replacement glass just to see how they compare.

No DIY :-)

May I ask what IG stands for?

Thanks.

IG is an abbreviation for Insulated Glass, or what you are calling double paned glass.

What most wood window companies (Weather Shield included) want you to do is replace the sash including the IG glass. This is far easier for all concerned but does entail having to finish the interior of the sash to match your home's decor (paint or stain). 99% of glass shops in the Bay area won't touch trying to reglaze a wood window.

Select Windows in Los Altos is probably your closest dealer that can order the right sash for you and install it. That way you won't have to deal with Weather Shield. This is much better than replacing the entire window unless there are wood rot issues in which case window replacement is your only recourse. But, you did say it was "broken seals".

Water vapor has entered the space between the two glass sheets and is fogging the window. A local glass shop was willing to quote the replacement but I will call Select Windows too.

Thanks

No response to a message left at Select Windows but Bull's Glass sent a tech to look at the window and will be providing a quote for the replacement. I did not quite get the terminology (sash?) but he said the wood immediately surrounding the glass had been somewhat damaged by the water between the glass panes but it wasn't something they could replace since they did not deal with WeatherShield.

P.S.: He also pointed out that an adjacent window that had been replaced under warranty used aluminum instead of wood for this part.