ModRoof is a custom manufactured and modular roofing system for houses.
ModRoof is an interlocking modular roofing system designed for low-income home owners. The commercialization of the product belongs to Pal Re Materials Pvt Ltd. The company is located in Changodar with operations in Ahmedabad, Mehsana, Vadodara, and Surat (India).
The company’s manufacturing and R&D facility is based in Changodar with operations in Ahmedabad, Mehsana, Vadodara and Surat. The company plans to expand to other regions in India such as Rajasthan, Maharashtra, Madhya Pradesh, and Delhi.
Pal Re Materials Pvt Ltd
2 – 3 USD per piece. Interview with manufacturer A ModRoof for a 23.2 m² slum home costs about 1,000 USD and can be paid with a loan from a micro-finance institution.
Current roofing options in the region for low-income households include tin sheets, cement sheets, plastic tarpaulin, reinforced concrete slabs or corrugated metal boards. Existing competitive solutions for cool roofs include solar-reflective white paint, Airlite louvered ventilators, and Thermocol false ceilings.
Goal 11: Sustainable cities and communities
Low-income households living in urban areas
Manufactured from recycled cardboard waste and natural fibers, the 0.5 x 0.5 m panels are installed side by side with a silicon sealant in between. Interview with manufacturer The base structure of the roof system consists of wood or metal rafters separated ≅0.5 m from each other.
Pal Re Materials Pvt Ltd manufactures, distributes, and installs the product. Users are offered enrollment into a micro-finance program to pay for the product.
An estimated 500 roof systems have been installed as of November 2019 (since January, 2014)
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List of suitable climates for use of this components
The system consists of recycled packaging waste and waterproofing additives enclosed within rectangular 0.5 x 0.5 m with thickness ≅ 0.05 m panels. With structural support, and silicon sealant, the system creates a watertight seal and a unified insulated roof surface. The interior insulation is cardboard waste, surrounded by a custom waterproofing coating. Circular clamps attach the panels to a typical metal tube frame roof structure. Interview with manufacturer
Pal Re Materials Pvt Ltd provides installation and support services.
The system is composed of interlocking modules that can be individually replaced. The system uses conventional fasteners to attach the modules to the rafters (metal or wood screws depending of the type of material and metal angle braces).
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 healthy 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. Beyond these more formal tests performed by Nirma University, 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.
A recent study performed by researchers at the Gujarat Institute of Desert Ecology, Indian Institute of Public Health, and the Mahila Housing Sewa Trust in India have compared the performance for thermal conductivity of a set of cool roof systems (including the ModRoof system) to conventional roofs made of tin, asbestos, cement sheets, and concrete slabs. The results of the study determined a reduction of 4.5 ºC in indoor temperature on roofs that used the ModRoof system compared to roofs that used tin, asbestos, cement sheets, and concrete slabs
Nirma University Interview with manufacturer
Gurajat Institute of Desert Ecology, Indian Institute of Public Health, and the Manila Housing Sewa Trust
Installers of the roofing panels are subject to the general dangers of any construction site including working from heights and with sharp tools.
The installation of the ModRoof system requires the complete removal of the existing roof. The roof panels are generally installed on a structure made of wood or metal rafters. Pal Re Materials Pvt Ltd has prototyped solar cells integrated into ModRoof panels.
Vellingiri, S., et al., 2020, Combating climate change-induced heat stress: Assessing cool roofs and its impact on the indoor ambient temperature of the households in the Urban slums of Ahmedabad. Indian Journal of Occupational and Environmental Medicine, 24, pp. 25-9.
The Gurajat Institute of Desert Ecology, the Indian Institute of Public Health, and the Mahila Housing Sewa Trust have conducted a cross-sectional study in a set of households in the city of Ahmedabad in 2017 to understand the impact of cool roof solutions on the indoor ambient temperature. Researchers collected data through questionnaires to householders and measured temperature change using a relative humidity/temperature data logger. The ModRoof was one of the roof systems analyzed during this study.
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