I learned a painful lesson today and I'd like to share in the hopes that others can avoid it. Carpenter ants have an affinity for blue styrofoam insulation. I had the blue board on my utility trailer awaiting installation. Last evening I noticed blue dust under the trailer. The pic below is what we found when we pulled the sheets apart this morning. 6 sheets are total garbage and another 5 have less severe damage. What a waist. Oddly enough, I had 3 sheets of 1" poly-iso next to them and they were untouched. We sorted out the good sheets and I returned them for poly-iso. We spent some time today treating the area for ants and will now continue to do so until winter strikes. Needless to say we were very upset and the budget took a good hit.
For all following this thread, please spread the word.