ModRoof is a modular roofing system for low income home owners.
Panels are currently being manufactured and field tested in Ahmedabad, India.
2-3 dollars per piece. Interview with manufacturer A ModRoof for a 23.2 sq m slum home costs about 50,000-60,000 rupees ($738-$885), and can be paid with a loan from a micro-finance institution.
Current roofing options in the region are mostly limited to expensive reinforced concrete slabs or inexpensive corrugated metal roofing. ModRoof seeks to fill the void in the market for high quality and low cost roofing. They are also developing a micro-financing model to make the option accessible to lower-earning households.
Goal 1 and 11: Aims to create dry, and thermally and acoustically comfortable living conditions for urban slum dwellers.
The urban poor, residents of informal settlements.
Manufactured from recycled cardboard waste, the square panels are installed side by side with a silicon sealant in between. Interview with manufacturer
Rematerials manufactures, distributes and installs the product. Users are offered enrollment into a micro-finance program to pay for the product.
An estimated 100 panels have been installed to date (since January, 2014). ^(Interview with manufacturer)
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
The system consists of recycled packaging waste enclosed within rectangular 2′ x 2′ (0.6m x 0.6m) metal panels. With structural support, and sylicon sealant, the system creates a water tight seal and a unified insulated roof surface. The interior insulation is cardboard waste, surrounded by a custom waterproofing enclosure. Circular clamps attach the panels to a typical 50mm x 50mm metal tube frame roof structure. Interview with manufacturer
Rematerials provides installation services. As the product is still a prototype, the company still provides tech support on the few roofs that have been installed.
The system is composed of modules that can be individually replaced.
15-20 year estimated life span. Interview with manufacturer
ModRoof specifies the following performance targets:
1. An affordable, improved alternative to available roofing systems.
2. An insulated, fire resistant rain barrier to sustain a health living environment.
3. The system is removable, so if the family must move, the roof can be packed up and relocated.
The roofing panels have been tested for cross breaking strength, thermal conductivity, flammability, thermal stability, thermal shock, water absorption, and creep.
Nirma University Interview with manufacturer
Installers of the roofing panels are subject to the general dangers of any construction site including working from heights and with sharp tools.
The roof panels are generally installed on a metal frame of 50mm x 50mm tubes. ReMaterials has prototyped solar cells integrated into ModRoof panels.
Unknown, though there are likely no regulations for roofing in India.
Beyond the more formal tests performed by Nirma University (see Vetted Performance section), qualitative field tests and user reviews have also been done and several are available on ModRoof’s Facebook page. Of the few installations, field tests and the user reviews have been positive. The system is strong such that the roof can support human occupancy – many families sleep on top of their roof during clear nights. Interior temperatures have been reported as noticeably less than under roofs of lesser quality. In practical tests on a hot summer day, this has shown the interior of a house outfitted with a metal roof to have a temperature of 42 °C (107.6 °F), while a comparable ModRoof-equipped home was 36 °C (96 °F). Interview with manufacturer
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