The color PINK is a registered trademark of Owens-Corning Fiberglas Corporation. Don't seal your attic space completely. The correct insulation must be combined with adequate ventilation to be most effective. Insulation should not block the flow of air from eaves' vents. For best results, install ventilation baffles at the inside of the eaves.
Attic condensation is pretty common in cold regions during the winter.
When warm moisture from the living spaces below the attic rises to the roof and meets the cold outside air, condensation forms. If it is severe, this moisture can cause rotting of the sheathing and framing. Wood roofs are not as susceptible because the moisture escapes easier. Asphalt roofs don't have the same natural air flow so moisture can become trapped and become a huge problem. Attics must be ventilated if they are going to be insulated.