GI vs PPGI Roofing Sheets: Which Should You Choose?

Compare galvanized iron and pre-painted galvanized iron roofing sheets by cost, appearance and corrosion resistance.

GI (Galvanized Iron) sheets

Zinc-coated for corrosion resistance, the most economical roofing option, typically left unpainted or site-painted.

PPGI (Pre-Painted GI) sheets

Factory-applied color coating adds both aesthetic value and an additional protective layer over the zinc coating.

Cost comparison

PPGI typically costs 15-25% more than plain GI but offers a longer color-consistent lifespan without repainting.

Choosing for your project

PPGI suits visible residential roofing; plain GI remains common for industrial sheds and budget-focused projects.

Use this in Build Mart Nepal

Turn the guidance into action by creating a project, loading a BOQ, matching local providers, issuing quotations and storing approvals in the Build Mart Nepal construction operating system.

Quick implementation checklist

• Define the required outcome and acceptance evidence.
• Assign an owner and target date.
• Record quotations, approvals and changes.
• Inspect completed work and retain handover records.