Mr Quyen - Santiago. Posted 03/11/2026
ASA/PVC roofing sheets do not rust, keep the space below about 6 – 8 °C cooler than bare metal sheets, cut rain noise by about 80% and hold their colour for 30 years. They also have limits that buyers must plan for: purlins less than 700 mm apart, a roof slope of at least 20%, a sheet at least 2.5 mm thick and careful handling of long sheets.
Blue ASA/PVC sheets on the roof of a chemical warehouse in Vietnam
What are the advantages of PVC roofing sheets?
| Advantage | What it means on site |
|---|---|
| No rust | The sheet contains no iron. Ammonia in animal houses, fertiliser dust, chemical fumes and salt air cannot rust it |
| Cooler | About 6 – 8 °C cooler under the roof than under bare metal sheets, because PVC conducts heat poorly |
| Quieter | About 80% less rain noise; a 2.5 – 3.0 mm sheet does not drum like thin metal |
| Colour | The ASA top layer is rated to keep its colour for 30 years |
| Service life | Typically 25 – 30 years in real use, with a 10-year warranty from 2.5 mm |
| Electrical | PVC is an electrical insulator |
The heat figure comes from Santiago's own testing. In a 10-minute test the frame roofed with metal reached 55.2 °C and the frame roofed with ASA/PVC 45.8 °C; for real buildings Santiago quotes the more cautious 6 – 8 °C. The heat, noise and corrosion tests are described in a separate article.
Blue ASA/PVC roofs over buildings beside a bay of fish farms, Song Cau, Phu Yen
What are the disadvantages of PVC roofing sheets?
Every roofing material has limits. These are the ones to plan for with ASA/PVC:
| Limit | How to deal with it |
|---|---|
| Softer than steel | Keep purlins less than 700 mm apart. A spacing that works for metal sheet is often too wide |
| Needs a slope | Lay the sheets on a slope of 20 – 45%; they are not made for flat or nearly flat roofs |
| Thin sheets sag | Buy 2.5 mm or more; Santiago gives no warranty below 2.5 mm |
| Long sheets bend if handled badly | Carry long sheets with several people or lift them with a spreader bar; never drag or fold them |
| Made to length | Sheets are cut to your length list, so check every measurement before you confirm |
| Walking on the roof | Step only along the lines of screws, where the purlins are, never in the middle of a span |
None of these is unusual for a plastic roof, but each one costs money if it is found out after the sheets arrive. The installer should know the purlin spacing before the frame is built.
Blue ASA/PVC roof and wall sheets on a new factory building in Vietnam
When is a metal sheet still the better choice?
A galvanised metal sheet can cost less overall in a dry inland building where rust is slow, nobody works under the roof all day and the existing frame has purlins too far apart for plastic. ASA/PVC pays back where metal rusts early: animal houses, fertiliser and chemical stores, buildings near the sea, and places where heat and rain noise under the roof matter.
Blue ASA/PVC roofs on hillside buildings at Nui Cam, An Giang
How do PVC roofing tiles cope with sun, rain and wind?
The short opens with red ASA/PVC tile sheets being carried up to a house, then a flame is put to a stack of tile sheets made from virgin PVC with an ASA top layer. It ends on a blue warehouse roof under installation and grey tile sheets on a roller line at the factory, with the WhatsApp number +84 935 391 495 on screen.
Santiago PVC roofing tiles in real conditions (Santiago video on YouTube).
More short videos: pros and limits on camera
The clips below come from Santiago's own YouTube channel and were filmed at the factory in Vietnam or on Santiago roofs.
What happens when a flame is put to PVC tile sheets?
A flame is put to a stack of grey and red tile sheets, Mr Quyen crouches on grey sheets in the factory, and the short ends on a blue warehouse roof where installers lay new sheets. A flame test is a demonstration, not a fire rating.
Heat test and a warehouse re-roof with uPVC sheets (Santiago video on YouTube).
How tough is the sheet surface? The truck test
A Santiago delivery truck drives over a blue ASA/PVC tile sheet and a blue corrugated sheet laid on the factory yard in Vietnam. It is a demonstration only; on a roof the sheet still needs purlins less than 700 mm apart.
Truck test on Santiago ASA/PVC sheets (Santiago video on YouTube).
Why do metal roofs feel hot and loud compared with tile sheets?
Mr Quyen holds a white tile sheet in the Santiago factory and explains in English, with captions, why bare metal roofs are hot, noisy in rain and costly to repair. The short then shows a red tile roof on a house and a finished grey tile roof beside the gutter.
Heat and rain noise: Santiago ASA/uPVC roofing explained (Santiago video on YouTube).
Santiago – a leading exporter of ASA/PVC roofing from Vietnam
Santiago roofing is produced and loaded into containers at our factory in Vietnam. It has been exported to India since 2023, Thailand since 2024 and the USA since 2025. Every export shipment comes with a commercial invoice, packing list, bill of lading and a certificate of origin (C/O) issued by Vietnam's Ministry of Industry and Trade, which importers use to claim the duty preference of their trade agreement.
| Item | Details |
|---|---|
| HS code | 3925.90.00 (ASA/PVC roofing sheets) |
| Certificate of origin | Form D (ASEAN), Form AI (India), Form AK / VK (Korea), Form AJ / VJ (Japan), Form VC (Chile), CPTPP proof of origin |
| Shipped from | Vietnam, by container |
Certificate of origin Form AI (ASEAN–India) for Santiago ASA/PVC roofing sheets, HS 39259000, certified on 24 September 2026. Buyer details are hidden.
The Santiago team beside a loaded export container at the factory, November 2024
Loading Santiago roof tiles into an export container
Frequently asked questions
Is PVC roofing any good?
Yes, where metal rusts or gets hot and noisy: farms, chemical and fertiliser stores, coastal buildings, workshops and homes. It needs purlins less than 700 mm apart and sheets at least 2.5 mm thick.
What are the disadvantages of PVC roofing sheets?
PVC is softer than steel, so it needs closer purlins (less than 700 mm), a slope of at least 20%, a thickness of 2.5 mm or more and careful handling of long sheets.
How long does a PVC roofing sheet last?
Santiago ASA/PVC sheets typically last 25 – 30 years in real use. The colour is rated for 30 years and the warranty is 10 years for sheets 2.5 mm and thicker.
Does a PVC roof rust?
No. The sheet has no metal in it. Use stainless screws with ASA caps so the fixings do not rust either.
Read more
- What Santiago's heat, noise and corrosion tests show
- A rust-free roof from top to frame: ASA/PVC on FRP purlins
- PVC roofing sheet thickness and weight: 2.5 or 3.0 mm
- ASA/PVC roofing sheet, 6 square waves
Sources for the figures in this article
- Profiles, 2.5–3.0 mm thickness and 10-year warranty: Santiago ASA/PVC product specification.
- About 6–8 °C cooler than bare metal sheet and about 80% less rain noise: Santiago's own comparisons on finished roofs in Vietnam.
- HS code 3925.90.00: Harmonized System Chapter 39 (builders' ware of plastics), as applied in Vietnam's export tariff.
- Certificates of origin (Form D, AI, AK/VK, AJ/VJ, VC, CPTPP): issued by Vietnam's Ministry of Industry and Trade under the country's free trade agreements.
- Minimum order of one 40 ft container (about 5,000 m) and about 5 days for production and loading: Santiago export desk, October 2026.
Updated 03/11/2026. Santiago Import Export Co., Ltd, Vietnam. WhatsApp +84 935 391 495 (Mr. Quyen), hotline +84 965 437 316 (Mrs. Ly), email salessantiagoroofing@gmail.com.
