Roofing in Thailand

Thailand has one of the richest roof traditions in Asia. Its temples and palaces carry stacked, steep roofs with serpent bargeboards and bird-beak finials, and its traditional houses combine tall gables, deep eaves and raised floors with regional variations from the hills of the north to the Muslim south.

Climate and hazards

Thailand's tropical monsoon climate brings a long rainy season, intense heat and, in the river plains, seasonal flooding. The south faces frequent storms from both coasts. Traditional design responds with steep pitches to shed rain, long eaves for shade, light materials that release heat quickly, and floors raised above flood level.

Roofing history

Sources on Thai housing describe clear evidence of elevated houses from around the 13th century, the period in which the Sukhothai kingdom was founded (traditionally B.E. 1780, about 1237 CE). During the Ayutthaya period (1350-1767), European visitors recorded houses of common people raised about 3-4 ft (0.9-1.2 m) above ground, and the German traveller Engelbert Kaempfer described bamboo huts in 1690. Chinese-style buildings (keng) existed in Ayutthaya, but most were destroyed in the wars with Burma that ended the kingdom in 1767. The late Ayutthaya period also produced the concave "sagging hull" temple roofline, yon thong samphao.

In the Rattanakosin (Bangkok) period, King Rama III's reign brought strong Chinese influence, including temple halls with Chinese-style roofs without finials. Kings Rama IV to Rama VI built in Western and hybrid styles; the Chakri Maha Prasat at the Grand Palace, from Rama V's reign, pairs a European body with Thai tiered roofs. Victorian-influenced "gingerbread" houses with fretwork eaves appeared in the 1860s-1870s.

Traditional and vernacular roofs

Temple and palace roofs. Ornamented tiered roofs are reserved for temples, palaces and important public buildings. Most have two or three tiers, and some royal temples have four. Their ornaments include the chofa finial, lamyong and bai raka bargeboards, and hang hong lower finials, all developed from the serpent (naga) and Garuda. See the separate entry on the Thai temple roof.

Houses (ruean thai). Traditional houses stand on posts, typically about 2 m (6.5 ft) high, leaving a shaded underfloor space (tai thun). Regional roofs differ:

• Central: high, steep gables, curved at the ridge, with long overhanging eaves; gable boards called ngao, hang pla and panlom finish the verges.
• North (Lanna): lower, heavier roofs with long eaves, crossed-board kalae finials on the gable peak, and coverings of terracotta tiles or wooden tiles (pan kled).
• Northeast (Isan): gentler slopes, often without eaves, sometimes with sunburst carving.
• Korat (Mon-influenced): very acute gables, steeper than 50 degrees.
• South: roofs built to withstand storms, including the five-ridged hipped lima or panya roof common in Pattani and the hip-and-gable Manila or blanor roof used by Muslim communities.

Temporary houses were thatched with grass, bamboo or palm leaves. Permanent houses in the central and northern regions used terracotta tiles in several forms: half-cylindrical kap kluay ("banana trunk"), square, sharp-cornered kled tao ("turtle shell") and hang yiao ("falcon tail") with upturned corners. Some northern houses used clay tiles in a fish-scale pattern.

Joinery traditions are named by construction method: khrueang sab for nail-free timber joinery and khrueang phook for tied bamboo.

Roofing today

Rooftop solar is growing: in May 2025 the Cabinet approved in principle a ministerial regulation under which rooftop solar panels weighing no more than 20 kg per square metre (about 4.1 lb/sq ft) need no prior building approval, because that load is not treated as a structural modification. Under the earlier rule, residential installations up to 160 m2 (about 1,720 sq ft) at that weight needed an inspection by a licensed civil engineer.

Codes, standards and regulation

Construction is governed by the Building Control Act B.E. 2522 (1979), with detailed requirements issued as ministerial regulations; the Ministry of Interior and the Building Control Committee oversee changes such as the 2025 solar rule.

Notable roofs

• Wat Phra Kaew and the Grand Palace, Bangkok: multi-tiered roofs with full chofa and naga ornament; the ordination hall has a multiple-front roof.
• Chakri Maha Prasat: Thai tiered roofs on a European-style hall.
• Wat Ratchaorasaram, Bangkok: a Thai-Chinese ordination hall rebuilt under Rama III with a single-front roof and no chofa.

Local roofing terms

• chofa - bird-beak ridge finial; hang hong - lower serpent-head finial
• lamyong, bai raka - serpent-form bargeboard and its blade-like projections
• kalae - crossed gable finial (north)
• ngao, panlom - gable boards (central)
• pan kled - wooden roof tiles
• kap kluay, kled tao, hang yiao - clay tile types
• lima / panya - hipped roof (south)

Sources and gaps

Census data on roof materials, roofing industry information and detailed code provisions for roofs: published information is limited.