Corrugated Metal Panels
A corrugated metal panel, as described here, is not a single product. These units are manufactured all around the world and are common as low cost roofing solutions. Though often referred to locally as iron, aluminum, or metal sheets, typical corrugated roofing sheets are made of steel. Not all are galvanized, and they vary from 27 gauge to 10 gauge. A standard sheet is one meter wide with a corrugated wave period of approximately 15cm, and a peak to peak amplitude of 5cm. Sheets typically come in three lengths: 3 meters, 2.5 meters, and 2 meters. There are many companies and distributers, therefore the links provided here are for example only.
Most urban centers have the resources to cut and mold such simple roofing sheets. The rolls of raw steel are often imported.
The weakest gauge can run as low as $8 – $10 USD per panel. Heavier 27 gauge can cost $15 USD or higher depending on geographic location. Price will increase into rural areas.
Standard corrugated roofing panels are available in every urban center in the world. Less expensive options include organic roofing material such as banana leaves or thatch. These options have shorter effective life spans and are vulnerable to fire. Stronger, more resilient options such as concrete roofs and clay tiles are time consuming to manufacture or are cost prohibitive for the slimmest of budgets. Other metal options include standing seam metal roofing of interlocking metal strips, or interlocking metal shingles or modular panels. The other metal options are less available in most developing contexts, but are becoming an opportunity for innovation.
Goal 1 and 11: Aims to provide fast, flexible, and affordable shelter.
Consumers, developers, or international aid organizations seeking inexpensive shelter solutions. Low income housing owners, as well as affordable realty developers are one of the main users of this product. International non-government organizations often use metal panels in construction of school and community scale building projects.
As one of the most common building materials in the world, corrugated metal panels have standard applications as well as informal, recycled uses. Below are a few notable articles written by practitioners in the field. These articles cover manufacturing and construction methods, as well as pros and cons of structures built with the product.
No patent seems to be enforced.
This product can be bought directly from manufacturers, distributors, local vendors. They are also used by international organizations.
An average of the maximum compressive strength a typical structure could withstand with this building material. Units: σ (N/mm2)
An average of the maximum loads/forces perpendicular to the compressive forces that a typical structure could withstand with this building material. Units: σ (N/mm2)
A seismic design category expresses an area’s likelihood of experiencing damaging effects of an earthquake (A(low), B, C, D0, D1, D2, E(high)). This parameter denotes the highest acceptable SDC for the material.
Climatic zones appropriate for construction based on a material’s availability/feasibility in each climatic zone.
R value associated with material/product
Not all are galvanized, and they vary from 27 gauge to 10 gauge. A standard sheet is one meter wide and comes in three lengths: 3 meters, 2.5 meters, and 2 meters. The panels have a corrugated wave profile period of approximately 15cm, and a peak to peak amplitude of 5cm. Aligned on roofing structure, overlapping one peak and valley, the system has an effective coverage of 80cm. The corrugation creates a flexible width and rigid length.
As the panels rust and become less effective, they are often consolidated to contribute to wall, window and door systems, and informal constructions.
Typical panels themselves do not present health risks. When placed upon low structures with poor ventilation however, solar gain can transfer substantial heat to the interior. This can create unfavorable conditions for occupants.
These panels are typically paired with framed roofing structures. Roofing nails, with a 1.5cm dia. cap, are typically located on every other peak. Sealing washers are preferred.
In warm climates, dropped ceilings are important for both thermal and acoustic (during rains) comfort.
This informative blog discusses manufacturing processes and applications for such panels.
Relevant (American) standard: Steel Deck Institute
It is important to pair corrugated metal roofing with proper ventilation or a suspended ceiling in order to minimize solar heat transfer to interior spaces and acoustic transmission when it rains.
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