Yet another window question (YAWQ): Pella Impervia feedback?
I’m building a house in central Oregon (zone 5). It’s a mostly passive solar design, with CMU shell construction that is insulated on the outside (my builder has a patented method to attach insulation to exterior of CMU walls) and this plus a mix of tile and concrete floors means I have a huge amount of thermal mass.
So we’re considering using Pella Impervia with their high SHGC “Natural Sun” glazing for five of the main south-facing 42″ x 112″ windows (Alpen and their better U-value is planned for the other 30+ windows).
Besides the higher SHGC offered by the Pella (Cardinal) glazing, the other benefit would be that Pella says a height of up to 112″ is doable, which is 16″ higher than most others. This taller size would make it tolerable for us to use these in place of expensive composite 2-tall (96″ over 30″) units for these five window locations. (Alpen’s price is surprisingly good for all other windows, it’s just the composite 2-high units that add a painful premium).
Before we pursue this mixed window approach, I thought I’d see if anyone had any new or updated feedback on Pella Impervia to share? I saw some comments from 2010 (I believe Riversong was specifying these in several houses then), but any updated endorsements, warnings, or regrets would be most appreciated! General web searches will convince one that Pella is just about the worst company ever and that I should count on some or all of the five windows leaking instantly, but I’m hoping that’s not really an accurate assessment…
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