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As respectfully as possible: 1. The amount of formaldehyde contained in a house full of solid wood naturally is orders of magnitude below what is found in even one sheet of regular plywood. 2. Pentane is also a naturally occuring gas. Which doesn't really matter, because gravity is all-natural...

ICFs do outgas. They outgas pentane, which is much less toxic than formaldehyde and has no long-term health effects. I did my reading :) (it helps that I'm a biologist too) I figured out the ledger board problem: I would just screw dimensional lumber to the webs in the ICF between the joists...

Another question: I'm using ICFs for the walls with Watkins hangers (http://watkinshanger.com/) to hang the floor joists. The Watkins hanger does not use a ledger board, you can see this in a couple of the picture on the website. How would I fasten the planking at the edges? Seems like a ledger...

You're right, the whale bones might contain unsafe levels of mercury... :) Is there anything I should know/keep in mind when doing this kind of subfloor?

Greetings, I'm new to the forum. We're building a new house and trying to make it as healthy as possible by avoiding materials that outgas harmful substances. One of the big ones is formaldehyde, which is outgassed by most types of engineered wood products. Right now I'm thinking about materials...