Roofing in São Tomé and Príncipe

São Tomé and Príncipe is a small island nation of about 200,000 people in the Gulf of Guinea, independent from Portugal since 1975. Its architectural landscape is shaped above all by the roças, the plantation estates that made the islands a major producer of coffee and cocoa in the colonial era. About two hundred roça sites, main and secondary, are counted, and in 2026 six of them were inscribed on the UNESCO World Heritage List as The Roças of Sao Tome and Principe: Colonial Agricultural System and Forced Migration, under criterion (iv).

Climate and hazards

The islands are volcanic, mountainous and equatorial, with heavy rainfall, high humidity and constant warmth. Roofs must shed intense rain and resist decay and corrosion; the coastal setting adds salt air.

Roofing history

The islands were reached by Portuguese navigators in 1470. A sugar economy developed in the 15th and 16th centuries but its mills had failed by the end of the 16th century. In the late 19th and early 20th centuries, coffee and cocoa drove a new wave of plantation building. After slavery was abolished in 1875, new health and sanitation rules shaped how roças were built, and estates with more than a thousand workers were required to have a hospital. The estates relied on forced labour and migration, with thousands of workers brought to the islands under harsh conditions.

Traditional and vernacular roofs

The roça is a complete settlement rather than a single building. Typical components are:

• Administration house, the residence of the estate managers.
• Hospital, compulsory on large estates.
• Sanzalas, the workers' quarters (called senzalas in Brazil).
• Terreiro, the open central yard used for drying cocoa beans, daily roll call, paying workers and festivities.
• Driers (secadores), warehouses, workshops, sawmills, soap and palm-oil works, bakeries and stables.
• Social buildings such as schools, nurseries, chapels and bandstands.

Roças are laid out in three main patterns: around a yard (roça terreiro, the most common), along an axis (roça avenida), or as a street network resembling a small town (roça cidade).

Roofing today

Many roça buildings are in fragile condition, and their preservation is a national heritage priority.

Notable roofs

• The Roças of Sao Tome and Principe: Colonial Agricultural System and Forced Migration (UNESCO World Heritage, 2026), a serial property of six plantations: Monte Café, Água Izé, Diogo Vaz, São João, Sundy and Belo Monte.

Local roofing terms

• roça (Portuguese): plantation estate.
• terreiro: central yard of a roça.
• sanzala: workers' housing on a roça.

Sources and gaps

No national roof-material figures were found in published sources.

The roofing materials and structures of roça buildings (for example clay tiles, timber or metal sheet) and of ordinary island houses were not described in published sources, nor were census data, codes or industry.