F.M.
Hi, K.--
So wonderful of you to think green! You might try calling around to places like the ReBuilding Center or even Ecohouse or the Sustainability Office in Portland's Ecotrust Building. I bet one of them will have a good answer for you. The woman who did the Rex house and has been blogging about it in the Oregonian would also be a great resource. Sorry I don't recall her name off the top of my head but she writes for the Oregonian in the Thursday Home and Garden section. She re-did a house over in Sellwood and recycled all the materials. Please let us know what you find out. Best of luck to you!