If any of you are wondering how accurate the overhang calculator is just have a look. Here is what the calculator predicted.

Here is my window.

Sure

How do I join?

I won’t be using spray foam. The aerogel insulation rolls look promising. I did opt for the insulation package and its wool fiber in a roll. I bought two of these domes for the price of one used. They were never installed so they are like new. I live in Denver so I’m not worried about moisture. I plan on installing an HRV for fresh air and a heat pump to keep things warm/cool. However I do plan to install a significant amount of thermal mass to assist with heating in the winter. I’m getting some shading designed for the summer months. Honestly I’m not worried about the temp. I’m more concerned with building to the passive house standard, and thoughtful construction that incorporates passive heating and cooling. I think as long as I address the seal around the base, I should be air tight. Thoughts? Suggestions?

@Ben Mengden I’d love to get something drawn up similar to what you suggested. Do you offer that service?

Thanks. I look forward to getting your feedback and input.

Indeed.