| Other items not listed are flashing materials, mastics, caulking material, fasteners, and roof insulation, to name a few. Now that you see the wide variety of materials available, you are probably wondering what the differences are. The difference in the base sheets is simple. Venting base sheets are specially-designed for use with moisture-cured substrates such as light weight insulating concrete or poured gypsum. Neither of which you homeowners will have to worry about. Regular base sheets are generally used with nailable decks such as plywood. The differences in the felts are determined by the types of reinforcement materials used. For instance, polyester felts are stronger than fiber glass felts which are stronger than organic felts. The fiber glass felts will vary among themselves in quality with Type III being the lowest quality and Type VI being the highest. |
