Galnasa

Galnasa is a Guatemalan roofing-materials company based in Guatemala City. Its range centres on corrugated, flat, pressed and pre-painted sheets, plus cut-to-size purlins, the basic inputs of metal roofs.

In a metal roof, the sheet type, gauge and coating determine resistance to corrosion and wind. Fixing, slope and lap sealing are as important as the sheet itself in preventing leaks.

Before buying, confirm lengths, available colours and compatibility with the existing structure. In extensions, mixing sheets of different gauge or finish can cause expansion and appearance problems.