|Incredible sunset outside the shop last night|
Today is one of the nicest days of the year. It is sunny, clear and warm out but somehow I find myself stuck inside on the computer researching insulation. I should have done this on one of those cold sloppy winter days. Oh well. They say you are not supposed to go grocery shopping when you're hungry, right?
Basically, I am ready to put my roof together. The 2x4 framing is finished, the paneling is back-primed and the sheathing is neatly stacked. All I need now is to pack the framing with some sort of insulation before I nail everything together. Last night I calculated the amount of insulation I will need. I have not done a good though comparison of different types of insulation yet, but my original thoughts were to use blown in cellulose. I want to avoid fiberglass for health/sustainability reasons. Cellulose is recycled, will fit all of my odd sized cavities and has a good R value. For the roof however, I need something lighter so that the panels will be a manageable weight. My first thought is to use EPS insulation (rigid boards of polystyrene, like foam cups). It is light, air tight an has an excellent R-value. It may not be the most sustainable option, but it might be a reasonable compromise. The last one I am considering, which might work for the walls and roof, is spray on expanding polyurethane foam. It can be made with soy oil rather than petroleum and supposedly has no VOCs when it is cured. This is important for me, especially in a space as small as mine. There is no Formaldehyde in my house yet! Spray foam does have the best performance characteristics but with that comes the price.
That is what I am considering, but I would love to hear of other options that you might know of. It is far too nice out for me to be inside any longer, so the research will have to wait for another day! I'm off to caulk the siding joints finally.