All of the gaps are about an half an 1/2", so I shouldn't be concerned. I called Pella, and they recommended using a product called "great stuff". I'm assuming it's legal in Central California, but I'll look further into it. Hopefully the contractor has experience with foam.
I do appreciate...
I have a home that was built in 1959 w/ the original windows. For the obvious reasons, I decided to replace the windows. Long story short, I decided to have Lowe's replace all of the 15 Windows in the house. They installed seven windows before being stopped; the windows were too small. Looking...