"ransley" wrote in message

What is the pink and blue board. I still hear about carpet, glues,
many things from oil can be of concern when new.

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The pink, blue, and yellow is extruded polystyrene board.

Poly as in polyurethane, so it outgasses.

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No, poly as in polystyrene so it does not outgas. I've been in this
industry for 39 years. To my knowledge, while Dow does make polyurethanes,
they are not for insulation. Styrene board does not outgas like the
urethanes do.