.an architectural diagram and instructional infographic detailing the traditional roofing techniques of the Doka traditional house (Rumah Adat Doka) from Indonesia. It breaks down the natural materials and assembly methods used to create a durable, thatched roof.
The infographic is titled "DETAIL ARSITEKTUR" (Architectural Detail) and is divided into specific components:
1. MATERIAL COMPONENTS
The top section of the image highlights the primary organic materials used in the construction:
🔹 Ikat Jerami (Straw Bundles): Shows how dry straw is bundled together. The text notes the length of each straw strand is approximately 25–30 cm.
🔹 Bambu Pilah (Split Bamboo): A hollow bamboo pole split lengthwise, used to "sandwich" or clamp the straw bundles.
🔹 Tali Rotan (Rattan Rope): Coiled natural fiber used for the "Sistem Ikat" (binding system) to secure all elements without the need for metal nails.
2. ASSEMBLY DETAILS
The top right shows a close-up of the "sandwich" technique:
🔹 The Binding: Split bamboo clamps the straw bundles together. This assembly also functions as the gording (purlins/horizontal beams) with a spacing of 20 cm.
🔹 The Overlap: To ensure water resistance, each layer of straw overlaps the one below it by 5–10 cm.
3. ROOF STRUCTURE (STRUKTUR ATAP)
The central 3D model illustrates a steep, triangular "shield" shaped frame (perisai). Key points mentioned in the text include:
🔹 Proportions: The roof height is designed to be proportional to the height of the house body to create a sturdy, balanced impression.
🔹 The Binding System: The entire structure relies on a binding system rather than modern fasteners.
🔹 Material Hierarchy: * Wood: Used for the primary structural frame.
🔹 Bamboo: Used for the horizontal purlins (gording).
🔹 Straw (Jerami): Used as the final roof covering.
SUMMARY OF ENGINEERING
This diagram showcases vernacular architecture, which focuses on using locally available, renewable materials to create a breathable and waterproof shelter. The steep pitch shown in the model is essential for tropical climates, as it allows heavy rainwater to run off quickly before it can soak through the straw layers.
