With walls up the next step is to pull wires and insulate this place.
This house has rough cut 2×4 walls so the R21 Fiberglass option is out. R13 Fiberglass could potentially be the way to go, but I want a way to eliminate air movement in my walls. If only there were some kind of magic material which had double the R value of fiberglass, was a moisture barrier, and I have access too.
Closed Cell spray foam insulation! R7 per inch(4xR7=R28). Very expensive to install($1.05 per board foot our cost) but it will pay for itself in 3 years due to no air movement knocking the heat out of my house. The only problem with this stuff is that you have to make sure you have a VOC Mask or even better, supplied air. It is a 2 part foam that loves moisture, and guess where there is a lot of that : your lungs. If you start spraying this stuff naked your lungs will be candy coated.
The spray foam that you see in Holmes on Homes and other DIY shows(spray 1/8 inch and it expands outside the walls) is an open cell foam which has the same R value as fiberglass and allows moisture to pass through, but is roughly half the cost. I want the highest R possible in my thin walls and I feel that closed cell is always the best option. We’ve done a lot of jobs tearing out improperly installed open cell with huge air voids so I simply don’t trust that product. An interesting fact about icynene brand spray foam : It can not stick to itself. If you spray it, cut it with a hot knife and there is an air void(which there can be a lot of) and you spray some more in, the product will not bond with the previously applied foam.
Next step : Hang drywall, climb up into the attic, spray the top of the drywall to create a 100% airseal.