Nice attention to detail. Couple things, for those interested in this topic for structures great and small:
1. Air sealing is typically more important than insulation, so definitely good that you foamed those windows. Sometimes it's even good to put a more elastic seal in those areas that's more robust over time.
2. By means of the rigid foam, you addressed thermal bridging, which is an important way to increase the overall thermal resistance of the assembly.
3. Depending on where it's produced, XPS foam, though readily available, is not the most environmentally friendly. In the US, it's typically produced with blowing agents that have relatively high global warming potential (GWP).
4. If you're curious about high performance building, Green Building Advisor (https://www.greenbuildingadvisor.com) is a great place to visit!
1. Air sealing is typically more important than insulation, so definitely good that you foamed those windows. Sometimes it's even good to put a more elastic seal in those areas that's more robust over time. 2. By means of the rigid foam, you addressed thermal bridging, which is an important way to increase the overall thermal resistance of the assembly. 3. Depending on where it's produced, XPS foam, though readily available, is not the most environmentally friendly. In the US, it's typically produced with blowing agents that have relatively high global warming potential (GWP). 4. If you're curious about high performance building, Green Building Advisor (https://www.greenbuildingadvisor.com) is a great place to visit!