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It is better to conduct roof insulation after the completion of the main construction work. After the insulation of walls and floor is carried out, you can proceed to the ceiling. If you have an attic floor, then to warm the ceiling of the first floor it will be enough to lay one layer of durable thermal insulation material, as well as a waterproofing film. However, the ceiling on the attic floor also requires additional insulation, especially if the attic is residential. A layer of insulation and waterproofing layer begin to be put immediately on ceiling floors. Remember that you need to leave a small gap between the ceiling overlap and the roof itself. The formed air cushion will make it possible to avoid condensate formation, as well as excessive heat losses.