It is Precisly in Order to Protect Both The Roofing Material and the Insulation INSULATION LAYER FROM MOOISTURE, WATERPROOFING FILMS OF DIFFERENT TYPES ARE. SOME For The Waterproofing of Roofing Material from the Outer Surface of the Wooden Roof, Others from the Inside, from the Attic. Most Waterprooping Materials are Microfoiled Moisture -Feeding Polymer Silicate Films that Absorb Condensed Moisture and Dry Quickly.