There will be two grades of insulation. The perimeter walls will have 4″ (10.16cm) of spray phone insulation which will provide for the bulk of the insulation properties. In addition, another 4″ of padded foam insulation will be used fro where the other components of infrastructure will be located at. Most of the infrastructure will not go into the spray foam in case something needs replacing or upgrading. Taking out padded foam insulation to make the repairs will be much easier than trying to deal with the spray foam, and then needing to get someone back in to spray the damaged parts. With that in mind, only piping will run in the spray foam insulations. Also since closed cell insulation is also a thermal break, there should be no chance of pipes ever freezing.