Sparrendach

Sparrendach, literally a "rafter roof," is a traditional timber roof framing in which the primary load-bearing elements are rafters (Sparren) that run from the ridge to the eaves, forming a triangular skeleton. In English-language references it is often described as a rafer roof or rafter roof, emphasizing the central role of the rafters.

Construction and main components: The rafters typically meet at the apex on a ridge beam or ridge board and transfer loads to the wall plates at the eaves. To resist outward thrust, the structure may include tie beams at the base and collar ties near the apex for added stability. Purlins (Pfetten) may run horizontally along the slope to provide intermediate support for the roofing material and reduce the required span of the rafters. A ceiling joist or floor beam can connect opposing rafters to form a ceiling or upper floor and to stiffen the frame. The roof covering is affixed to the rafters and purlins rather than to a central framework.

Variants and usage: Sparrendach is one of the most common roof forms in traditional timber-framed architecture, barns, and houses across Central Europe, particularly in older buildings. It is often contrasted with Pfettendach (beam-and-purlin roof), which relies more on horizontal members for support. In modern construction, sparrendächer are still used in renovations and new builds when a traditional appearance is desired, often combined with modern insulation and fastenings.