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Insulated walls and ceilingA well-insulated home prevents the transfer of heat through the roof and the walls. “Passive cooling requires the building design to incorporate techniques in the building itself, such as cavity walls, roof insulation and other reflective building materials that may help the building for additional cooling without depending on technology,” suggests Sharma. A reflective roof coating or a light-coloured roof reflects a lot of the heat from solar radiation.A roof garden cuts off heat, as the lawn and the mud in the potted plants absorb the heat that hits the roof.Cavity walls are excellent insulators. Using hollow bricks for the construction of exterior walls gives better thermal insulation than solid walls. The air in the hollow bricks prevents transmission of heat from the outdoors into the indoors.Finish the windows with low-emissivity coating and films to reduce heat loss through the window.Note: Consider a false ceiling for insulating the rooms that are immediately below the roof. The air gap between the true ceiling and false ceiling works as an insulating layer that prevents indoor heat gain.How to Beat the Summer Heat by Keeping the Roof Cool
2. Paint the terrace whiteHeat gain can be considerably reduced by turning the roof into a reflective roof surface. How?Paint the concrete floor with cool roof paints. These paints provide good thermal insulation by reflecting the sun’s rays and keeping the indoors cool. Brands such as Dr Fixit have such products on offer.A cost-effective way to keep the roof cool throughout summer is by coating the floor with white lime wash, locally known as chuna. One drawback with using lime wash is that it gets washed away during the monsoon season, hence reapplication is required every summer.For a more permanent solution one can install white ceramic or porcelain tiles on the roof.Find roof tiling experts near you
4. Environmentally friendly Cement tiles are environmentally friendly because they are not baked to harden like other conventional tiling materials and hence take less energy to manufacture. The primary ingredients of cement tiles include sustainable materials such as Portland cement, marble dust and natural pigments. In this example, just see how the patterned cement tiles give such a finished look to the exteriors.
3. Cement tilesThere is nothing to compare with introducing bold patterns into spaces like the balcony or the patio. In this example, the cement-tiled floor becomes a canvas that brings colour, pattern and a beautiful heritage look into the terrace. These outdoor floor tiles are also known as encaustic cement tiles; they are hand-crafted tiles and come with intricate patterns that add an element of art to any space. It is essential to seal outdoor cement floor tiles so that they resist stains and fading, and to prevent moisture from penetrating the tiles.
1. Paint the roof and terraces whiteA considerable amount of heat gain in buildings occurs through the roofs, simply because they are large surfaces directly under the sun. However, it is proven that this heat gain can be reduced by more than 60 per cent by turning any roof into a reflective roof. Simply painting the roof and terraces white (with a sun-reflective white paint) can aid in reflecting the heat from the summer sun all through the day. Hydrated lime (our good old-fashioned chuna) is a great (and easily available) alternative used for this purpose. Reflective roofs are also favourable for cooling down penthouse apartments and flats located on the topmost floor of a highrise building.