When people in Bangladesh say dheu tin, they mean the wavy metal sheet you see on village homes, roadside shops, poultry sheds, markets, and school extensions. In English, it is referred to as a corrugated iron sheet or corrugated galvanized iron (CGI) sheet. The word dheu or dhew comes from the Bangla word for ‘wave’ because the sheet is pressed into a wave pattern that makes it strong. This simple shape, together with a protective zinc layer on the GP sheet, has made dheu tin a trusted roofing material in our country for generations. It is affordable, easy to carry, quick to install, and tough enough for heavy rain and strong winds. For families in rural and sub-urban areas, a good roof is not a luxury. It is safety, comfort, and peace of mind.