Calculate the amount of insulation by dividing your attic's square footage by the coverage area of the insulation package you plan to purchase.
Drying time for wet insulation depends on type, ventilation, temperature, and humidity. If it doesn't dry within 2-3 days, it should be removed to prevent mold and wood decay.
Insulation should face the living space, with the vapor barrier (the paper or foil backing) towards the interior to help control moisture.