Quick Answer: What Is a Xuanshan Overhanging Gable Roof?
An overhanging gable roof (悬山顶, xuánshān dǐng) has two slopes, toward the front and rear. At either short end, the roof projects past the gable wall. Horizontal timbers called purlins extend beyond the wall to carry the projecting roof.[1][2]
- Look at the short end: A strip of roof covers space beyond the gable wall.[1][2]
- Follow the timbers: The purlins run parallel to the main ridge.[2]
- Look beneath the edge: Boards can cover the ends of the projecting purlins.[2][3]
The overhang at the gable identifies the form. Front and rear eaves occur on other roof types as well.[1][2]
In an oblique view of a hall, the projecting edge casts a narrow shadow across the upper part of the short wall. A corner view shows the offset between the gable and the edge of the tiles.[1][2]
How Purlins Carry the Gable Overhang
Purlins run lengthwise through the roof frame and support the rafters. In a xuanshan roof, they continue out beyond the end wall. Those projecting ends support the short strip of roof beside the gable. Viewed from under the overhang, the direction of the timbers is the clue. Purlins run along the length of the building. Rafters cross them and follow the slopes down toward the eaves.[2]
A bargeboard (博风板, bófēngbǎn) follows the sloping outer edge and can cover the ends of the purlins. Guangzhou’s heritage guidance also describes these boards on hip-and-gable roofs. Read the board as part of the edge treatment, and then look at the larger roof form.[3]
Xuanshan Compared with the Flush Gable
A flush gable roof (硬山顶, yìngshān dǐng) also has a front and a rear slope. The roof edges at the short ends meet the plane of the gable walls. In xuanshan, the short end roof edge sits farther out. Look along the wall so both the wall face and the end of the tiles stay in view.[1][2]
The same way of looking works across traditional Chinese roof types. A hip-and-gable roof has a separate lower tiled slope on its short end, beneath the upright gable. A xuanshan overhang follows the front and rear slopes past the gable wall.[1][2]
Examples in Shandong and Henan
At Yanzi Temple in Ningyang, Shandong, the main hall has a grey-tiled overhanging gable roof. The provincial heritage inventory describes grey-tiled flush gable roofs on the ritual gate and the temple entrance. The grey tiles give the buildings a shared finish. Their short-end roof edges reveal which form each building uses.[4]
In Zhicheng, Jiyuan, the Ming-period Guandi Temple hall has a single-eave xuanshan roof and a front veranda. The front veranda adds covered space along one long face. The projecting edge at the short end identifies its roof type.[2][5]
The shape also appeared in residential building practice. Prince Kung’s Palace Museum notes that Qing rules permitted both projecting and flush gable forms on the main halls of ordinary residences. The temple examples show the form in two other settings.[4][5][6]
FAQs About Xuanshan Roofs
Does a projecting front eave make a roof xuanshan?
Look at the gable ends. The defining projection extends past the short end walls.[1][2]
Do you have to see the purlin ends?
A board can hide them. Look for the roof edge projecting beyond the wall.[2][3]
Does tile color identify an overhanging gable roof?
The defining clue is the relationship between the roof edge and gable wall. The form can use grey tiles, as at Yanzi Temple.[1][2][4]
Sources
[1] The Palace Museum. Overhanging Gable Roof
[2] Shenyang Palace Museum. Traditional Chinese Roof Types
[3] Guangzhou Municipal Bureau of Culture, Radio, Television and Tourism. Historic Timber Details and Bargeboards
[4] Shandong Provincial Department of Culture and Tourism. Nationally Protected Sites and Yanzi Temple
[5] Zhengzhou Shangdu Institute for Cultural Heritage Conservation. Timber Halls and Their Roofs in Jiyuan
[6] Prince Kung’s Palace Museum. Gable Roof Forms and Qing Building Conventions