I am building my new coop and figured I'd insulate once I got everything done on the outside. I was thinking of using that pink foam board but I thing it only has an R rating of 5. It's cheap, but will that be enough? I doubt it. I have a non-cold-hardy hen (a Sultan) and I worry about her being out there in our ridiculous NE winters. I am in RI, so I am looking for coop owners who are in RI, SE MA or CT to offer what they've done. Thanks!