Minecraft wiki entry for Roof_types, associated text: Thatching is another ancient roofing style using materials such as straw, reeds, sedge, rushes or heather. While a thatched roof can incorporate most of the design styles used on this page, including dormers, the main roof is usually made of a single uninterrupted layer to avoid water leaking through. Roof variants such as cross-gabling or monitors are rarely seen on thatched buildings.