For our weather conditions I got the E-glass and argon gas in between the panels. I also decided against any of the multipane dividers or other grids and chose just full light panels. The Pella's have a lifetime warranty and we had a mix of sliders and also some single hung casement windows. Our home had 2 window boxes that were very poorly built and in need of redoing so part of my project involved tearing out the boxes and construction new ones to hold the windows. When my son helped me with the upstairs ones we also found hidden damage from water intrusion so ended up removing the siding panels in one section and fixing everything before sealing it up and finishing with Hardiplank sheets (the old siding was like textured Masonite or something). Also where ever possible I used the proper butyl mylar flashing tape prior to the window going in and used expandable urethane foam to fill all spaces where needed before attaching new cedar trim (could have used Hardiplank but painted ceder is just as durable in my opinion) and painted and caulked all of that. And finally, our home interior has the newer contemporary look where they just drywall the window sill area where it meets the glass, no wood molding or anything. I like the classic style so I replaced the lower sill (it's like a 1 x 6 with a rounded edge) with a wider one and I did casement molding on the top and both sides and under the sill. It gives it a much nicer finished look in my opinion.
I know that any installer would not have gone to that much trouble or expense as their goal is to get the job done in a day or 2. They typically under measure the size for the replacement and use trim and caulk to fill in the gaps and believe me they use a lot of tubes of caulk.
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