I am brand new to BYC and to chickens in general. We live in Alaska and I have been researching the subject of chickens this past winter in preparation for the spring remodeling of our unused kids playhouse, which is the first line of industry for us. So, it is 8'x8' by 8' high in center with 4 screened windows currently. It is stick built of mostly 4x4s so with our harsh winters, we surely have to insulate. We can get insulfoam (foam insulation) which is the best for what we have since we did not build "on center" widths between studs and trusses so need to cut the right width. In perusing the site, I did not see that anyone had addressed whether a vapor barrier is necessary. We will be using a heat lamp during the coldest times and will have insulated lexan windows, which are slightly better than single pane glass but not as good as thermal-pane. We plan to finish the walls and ceiling in pre-finished paneling to keep them cleanable. So, for all you contractor types, should we use vapor barrier with the foam? Thanks for all the posts...nice to get so many answers to my many questions, even before I have to ask!!