These Laws are many, relative to the small number of Biblical Verses spent explaining them: Chagigah 11a
Creation of the Roof
Where the structure was created naturally, not by humans: Succah 20b-21b
Dimensions of the Roof
Minimum area, to communicate impurity: Eruvin 10b
Annuling a gap in a roof, based on its surrounding area, and including the gap's space toward the measurement of the entire roof: Eruvin 10b
Idiosyncratic Rooves
Communication of impurity through a roof, if part of it is underneath a skylight which is more than a Tefach [Hand-Breadth] wide: Shabbat 157a-b; Succah 18a