sandalboy

I like seeing someone debating the greeness of things. Insulations long term savings of resources certainly outweighs any lack of greeness at the manufacturing end. I don't think the water issue is a good enough reason to justify using fiberglass though. Plenty of rot has occurred in the presence of fiberglass insulation. And, it doesn't seem to do a very good job at it's intended purpose. Even in a fully sealed chamber air currents within itself keep it from competing very well with foam or cellulose. Since perfect air sealing in a building is not likely especially after it is decades old why use something that does nothing to prevent air infiltration. Fiberglass is not a green material in my opinion.

I've got dense packed cellulose and rigid foam board in about half of my house. There is no question in my mind that they, alone or in combination, are the best value in insulation. They are reasonably green since the energy saved is so great. I have fiberglass batts in about 1/4 of my house and regret putting it in.

I think that SIPs are probably the greenest way to go when all things are considered.