This guide covers what contractors, roofing sheet fabricators, and sandwich panel manufacturers should know when sourcing PPGI or PPAZ coil for PEB projects.
Why Coil Choice Matters More on a PEB Than on Conventional Builds
A PEB's roof and wall cladding is structural steel sheet, not a decorative finish — it directly carries wind load, thermal cycling, and weather exposure across large, often unsupported spans. Roofing sheets are typically roll-formed from coil supplied to fabricators and profile manufacturers, then fixed onto purlins as the building's outer envelope. If the base coil is under-specified on zinc coating or coating thickness, the failure shows up as rust streaking or panel deformation years before the structure's designed lifespan — a costly warranty issue for the contractor, not the coil supplier.
PPGI vs PPAZ for PEB Roofing and Cladding
Both materials are used across GCC PEB construction, and the right choice depends on the project's exposure conditions.
PPGI (Prepainted Galvanized Steel) uses a hot-dip zinc-coated substrate, typically specified between 120 and 275 GSM depending on load and exposure. It is the standard choice for inland industrial sheds, warehouses, and factory roofing where cost efficiency matters and coastal salt exposure is limited.
PPAZ (Prepainted Aluzinc) uses an aluminium-zinc alloy coating (AZ30 to AZ150), which offers stronger corrosion resistance in coastal, high-humidity, or industrial-pollution environments — common along the UAE coastline and Gulf ports. PPAZ generally commands a price premium over PPGI but reduces long-term maintenance and re-coating costs on structures near the sea.
For inland Saudi or UAE desert-zone PEBs, PPGI with a durable coating system is usually sufficient. For coastal Dubai, Abu Dhabi, Sharjah, or Gulf port-adjacent sites, PPAZ is the more defensible long-term specification.
Coating System Selection for PEB Roofing
The paint system on top of the zinc or Aluzinc layer determines how the roof handles UV exposure and weathering over its service life:
- RMP (Regular Modified Polyester) — the most economical option, suited to internal partitions and lower-exposure cladding within a PEB envelope.
- SMP (Silicon Modified Polyester) — a stronger mid-tier choice for exterior roofing and wall panels in standard industrial exposure.
- PVDF — specified for high-visibility facades, long-design-life warehouses, or projects near the coast where 20+ years of colour and gloss retention is required.
Matching the coating grade to the building's actual exposure — rather than over- or under-specifying — is one of the simplest ways a contractor controls both upfront cost and long-term maintenance liability.
What to Check Before Placing a Bulk Coil Order
For fabricators and contractors buying coil in volume for a PEB project, five checks reduce risk before the order is confirmed:
- Confirm actual GSM/AZ coating class via mill test certificate, not just the datasheet figure.
- Match coil thickness (typically 0.20mm–1.50mm) and width (650mm–1350mm) to the roll-forming line and structural span requirements.
- Verify coating thickness (standard 5+20 microns, up to 200 microns for specialised finishes) matches the specification sheet, not a generic default.
- Request traceable batch documentation covering base metal grade, coating class, and paint type for every coil in the order — critical for warehouse and factory projects where warranty claims may surface years later.
- Check ISO 9001/14001/45001 and SASO certification of the coil manufacturer, since these indicate documented, auditable production processes rather than one-off quality claims.
Sourcing Coil for Roll-Forming and Sandwich Panel Production
Roofing sheet fabricators and sandwich panel manufacturers supplying PEB projects across the UAE, GCC, and export markets need a consistent coil supply that matches specification batch after batch — inconsistent GSM or coating thickness between shipments creates visible colour and performance mismatches across a single roof.
Arabian Iron and Steel LLC (AISL) manufactures PPGI, PPAZ, and PPAL coils at our Continuous Color Coating Line in Umm Al Quwain, UAE, with an annual capacity of 150,000 MT and full batch traceability across every order. We supply fabricators, roll-formers, and sandwich panel manufacturers directly, with documentation to match your project specification from the first coil to the last.
If you are sourcing coil for an upcoming PEB, warehouse, or industrial shed project, contact our team for a specification-matched quote and current availability.
