As I start the beginnings of building my own home, I have tossed ideas back and forth in my own mind, so i figure I would also turn here to get some more respected advice.
On my mind right now is framing/insulation/sheathing for the home i want to build. My questions are in regard to how much is 'too much' insulation or is that even possible / worth the extra cost. I live in Fort Collins, CO which is climate zone 5. I am going to be building a relatively smaller 2 story home, probably around 1,000 sq. ft. and I like the idea of 2x6 framing 24" OC, with advanced framing techniques to get the most out of my insulation. BUT i also like the idea of using rigid foam sheets on top of the sheathing to reduce thermal bridging through the studs. I'm not talking about just rigid foam for sheathing, because I know that creates headaches structurally, so I'm talking about 1-2" of rigid foam on top of OSB, sheathing the 2x6 walls.
I assume 2x6 24"OC framing insulated properly would definitely do the job, but i'm just not sure if the 1-2" of rigid foam would be worth the extra hassle and money. Is there a point in insulating a new home where it just gets ridiculous and the costs start outweighing the savings? I want to do my first home build right, so in my mind overkill with insulation and sealing everything up sounds like a nice cozy home to me! I don't know how much of a concern this would be, but doing the above would also create walls that are about 9" thick all said and done, which creates more custom work on the windows....
Thanks in advance for any input and advice. If you think 2x6 walls with batt insulation and regular sheathing will keep me happy and cozy, let me know.