"Roof sandwich panel" suggests a type of roofing material constructed by sandwiching a core material, possibly foam insulation or another lightweight material, between two facing layers, which could be aluminum and galvanized iron in this case.
"33/250" typically indicates the thickness of the sandwich panel, where "33" might refer to the thickness of the core material in millimeters, and "250" might represent the total thickness of the panel including the facing materials.
Aluminum and GI are commonly used in construction due to their durability and resistance to corrosion, making them suitable for outdoor applications like roofing. Sandwich panels offer benefits such as thermal insulation, ease of installation, and structural strength, making them a popular choice for roofing systems in various buildings, including industrial, commercial, and residential structures.