The document is a presentation on flat roofs that introduces learners to the topic. It defines a flat roof as having a slope of less than 10 degrees and discusses two key components - roof joists and covering materials. It also describes the three main methods for obtaining fall, or slope, on a flat roof: sloping roof joists, tapered firring pieces, and deepened joists. Common flat roof covering materials include chipboard sheets, underfelt, and green mineral felt.