At new construction, per the latest VA building code, attic insulation needs to be an R-38, what type of insulation is not specified. Exterior walls should be insulated to an R-15, no specification on the type of insulation. In a vented crawl space, R-19 in the floor meets code, in an Encapsulated or Conditioned Crawl Space, an R-10 of continuous insulation on the crawl space walls meets code.