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).
Market Suggested Retail Price
Distributors / Implementing Organizations
Pal Re Materials Pvt Ltd
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.
Intellectural Property Type
User Provision Model
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.
Distributions to Date Status
An estimated 500 roof systems have been installed as of November 2019 (since January, 2014)
Unit dimensions (cm)
50 x 50 cm
Waste cardboard and coconut husk fibers
Adhesive, waterproofing additives, coating
Fire Resistance (hr)
Thermal Insulation Capacity
Compressive Strength (MPa)
4.9 MPa (one panel can withstand approx 200 kg of point load)
Suitable in all climates
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
Manufacturer Specified Performance Parameters
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.
Vetted Performance Status
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
Installers of the roofing panels are subject to the general dangers of any construction site including working from heights and with sharp tools.
Complementary Technical Systems
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.
Academic Research and References
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.
Compliance with regulations