NGỌC LINH
TECHNOLOGY TO RESIST BLOWN-OFF ROOF
An enclosed house can be simply understood as a house with all openings (i.e. doors and windows) closed yet still has unintended (random) gaps between roof tiles or gaps in the openings assemblies.
Actual observation shows that most houses' roofs are blown off immediately after a gust blow through the house (i.e when the wind speed increases sharply over only approximately 0.3-0.5s). According to Bernoulli's Principle, the primary cause for this phenomenon is the sudden air pressure difference between the inside and outside of the house during a wind gust. More specifically, this air pressure difference is caused by the sharp acceleration of wind speed, causing the air pressure outside the house to plummet. The roof is blown off at the spots where there are the largest air pressure difference. These blown-off spots themselves are new ventilation openings through which air can leak out and thus, they prevent the roof from being further ripped off while the storm continues. In conclusion, when wind gusts (i.e air pressure difference occurs), roof ventilation openings are crutial because they help the inside air leak out of the house (air moves from areas of high pressure to those of low pressure), which leads to the decrease of pressure difference. NGOC LINH Stormwind-resistant tile is the ideal solution for this problem.
Our technology was selected as one of the four finalists in the ShelterTech Category of Asia-Pacific Housing Forum Innovation Awards 2021, which was held by Habitat for Humanity International on December 9, 2021.
