Madhubani district in Bihar continues to host a significant number of traditional clay tile houses, locally known as khaprail structures. While these mud-baked tile dwellings offer excellent natural insulation against regional weather extremes, maintaining their structural integrity poses a unique technical challenge. Because baked clay is naturally fragile, these traditional roofs require specialized techniques to prevent water leakage and seepage during the monsoon.
Roof Structure and Common Causes of Water Leakage
The architecture of a traditional tiled roof relies on an underlying support network of bamboo, wood, and dried grass thatch, over which the baked clay tiles are meticulously arranged. The complex four-corner roof design makes maintenance work difficult for untrained hands. In rural areas, external factors such as roaming monkeys stepping on the tiles or heavy objects landing on the roof frequently cause tiles to crack. Once a tile fractures, rainwater quickly penetrates the inner thatch layer and drips into the living space below.
Traditional Seepage Prevention with Wet Clay Slurry
Protecting tiled roofs from water damage relies heavily on traditional craftsmanship passed down through generations. According to Shatrughan, a local veteran mason in Madhubani, repairing these roofs requires a wet clay slurry known locally as gilewa. Just as modern brick construction uses cement mortar, artisans use this carefully prepared clay mixture to seal and align the tiles seamlessly. This precise fitting ensures that rainwater flows off the sloped roof rapidly without finding channels to seep inside.
Thermal Benefits and Modern Adaptations Over Asbestos
Despite the maintenance effort, clay tile homes remain popular for their exceptional thermal performance. They stay noticeably cool during peak summer heat and remain comfortably insulated during winters. Modern building trends have caused traditional tile kilns to close down, making new clay tiles scarce. Consequently, residents who still possess surplus tiles often layer them over modern asbestos roofing sheets, creating an effective barrier that reduces solar heat absorption in their homes.
