The top of the roof frame is covered using tongue and groove plywood. The plywood is wrapped in roofing felt before adding 3-tab asphalt shingles. Roofs usually overhang a porch by at least 12” to properly shed water. Soffits and fascia are principal roof parts that are visible in the roof overhang. Fascia board runs vertically around the ends of the rafters in order to cap the ends and to hold the rain gutter. Soffits are built from a variety of materials and cover the underside of the roof overhang. Soffits can be non-ventilated or ventilated to allow cooling of the enclosed ceiling space. Ice and water shield and flashing should be used wherever necessary to prevent water from penetrating the roof system.
Screens can be fitted between support posts to allow air flow but to keep insects out. Electrical outlets and fixtures such as lights and fans can be installed to porch interiors. There are many ways to finish porches including installing tongue and groove cedar across the ceiling and back wall. Knee walls can be substituted for rails and operable windows and even skylights can be installed. Your imagination and pocketbook are your only limitations.