What type of roofing involves using a granulated surface along with a smooth area?

The type of roofing that involves using a granulated surface along with a smooth area is double-coverage roll roofing. This roofing material consists of a series of rolled sheets that are typically asphalt-based. The granulated surface provides protection against UV rays and enhances the aesthetic appeal of the installation, while the smooth area is present on the underside, allowing for adhesion or fastening to the substrate beneath.

In double-coverage roll roofing, the layering technique used ensures there is an overlap with two layers of roofing material, enhancing the waterproofing capabilities. This design is particularly effective for low-slope roofs, ensuring that water runs off effectively without pooling. The combination of granulated and smooth surfaces helps in both functionality and durability, making it suitable for various roofing applications.

Metal roofing, single-ply roofing, and thatch roofing do not typically feature both granulated and smooth surfaces in the same way as double-coverage roll roofing does. Metal roofing usually consists of solid metal sheets or tiles, single-ply roofing is made from flexible sheets of membrane, and thatch roofing employs natural materials like reed or straw, without such granulation or layering.