Mr Quyen - Santiago. Posted 13/11/2026
A Santiago ASA/PVC tile sheet gives a pergola or patio a curved-tile look close to a tiled house roof, keeps the space under it 6 – 8 °C cooler than bare metal sheet and cuts rain noise by about 80% (Santiago tests). It needs a slope of at least 20% (about 11°), so it suits pitched and gable patio roofs, not near-flat ones. A 4 × 6 m skillion patio takes 7 sheets of 4.380 m, and the sheet can enter Australia under CPTPP with proof of origin from Santiago.
Outdoor dining area with purple-red tile roofs behind, Vietnam
Why does a metal patio roof often feel wrong next to a tiled house?
Plenty of Australian homes carry a terracotta or concrete tile roof, and the alfresco area added later gets a flat metal roof because that is what the patio builder had on the truck. From the garden you then see two roofs that do not belong together: rows of tiles on the house, a flat band of sheet next to it.
The other complaints come after the first summer. By mid-afternoon a bare metal patio roof radiates heat down onto the outdoor table, and in a storm the rain drums on it loud enough to stop a conversation. A tile sheet goes after both problems at once, as long as the patio frame can take the slope it needs.
Can a pergola roof look like the tiles on the house?
Close to it. The Santiago sheet has a Spanish-style profile, so the roof shows a row of curved tiles every 219 mm. The colour sits in an ASA top layer over virgin PVC, a PVC core and a milky-white PVC base that faces the people sitting underneath. All four layers are co-extruded with no glue, and the material is virgin, not recycled.
It will not copy the exact profile of a flat concrete tile or an old terracotta tile. If the goal is to match the house, ask for free samples (the buyer pays the courier), hold them up against the house roof in daylight and choose from there. Ridge caps, wall flashing and eave sealing tiles come in the same colours as the sheet, so the edges do not give the roof away.
| Patio question | Tile sheet answer |
|---|---|
| What does it look like? | Rows of curved tiles, one every 219 mm |
| Standard colours | Dark grey, red, blue, orange, chocolate |
| Made-to-order colours | Green, white, purple |
| Underside | Milky-white PVC; dark underside made to order |
| Thickness | 2.5 or 3.0 mm; 2.5 mm is the minimum for a roof |
| Weight on the frame | About 5.4 kg per m² of roof at 2.5 mm |
| Sheet width | 1.05 m full, 0.96 m cover after the side lap |
| Length | Cut to order in 219 mm steps |
| Warranty | 10 years for 2.5 mm and thicker, installed as Santiago recommends |
Is it cooler and quieter than a metal pergola roof?
In Santiago's tests the space under the tile sheet stays 6 – 8 °C cooler than under bare metal sheet, and rain noise is about 80% lower. Under a patio those two numbers are the ones you notice: the table is usable later into a hot afternoon, and a storm sounds like rain rather than a drum.
For the Australian sun the question owners ask next is fading. The ASA top layer showed no colour change after 2,000 hours of artificial UV, the colour is rated for 30 years and real service life is 25 – 30 years. There is no metal in the sheet, so nothing to rust, and bending strength is above 1,000 N.
Steel pergola beside buildings with tile roofs, Vietnam
What pergola roof pitch does a tile sheet need?
Between 20% and 45%. Many flat patio roofs are laid much lower than that, so this is the first thing to check, before colour or anything else. On an attached skillion patio the slope decides how much higher the back beam at the house wall sits than the front beam.
| Slope | Angle | Rise over a 4 m deep patio |
|---|---|---|
| 20% (minimum) | about 11.3° | 0.8 m |
| 25% | about 14.0° | 1.0 m |
| 30% | about 16.7° | 1.2 m |
| 45% (maximum) | about 24.2° | 1.8 m |
If the house eave or gutter leaves no room for that rise, a freestanding pergola or a gable patio roof with its ridge in the middle is the usual way round, because each face of a gable only climbs over half the depth.
Can I put skylight sheets over the outdoor table?
Yes. Santiago skylight sheets let through 80 – 90% of the light and are normally used on 5 – 10% of the roof area. On the 29 m² patio in the example below that is about 1.5 – 3 m², enough for a strip over the dining table or the kitchen bench while the rest of the roof stays shaded. Tell Santiago you are using the tile profile so the skylight sheet is matched to it before the order is confirmed; our article on skylight roofing sheet profiles and how many to use has more detail.
How many sheets does a 4 × 6 m patio need? A worked example
Take a skillion patio attached to the back of a house: 6 m along the house wall, 4 m deep, falling away from the house at 25%. The roof runs 0.3 m past each side post and about 0.24 m past the front beam.
| Step | Working | Result |
|---|---|---|
| Rise at the house wall | 4.0 m × 25% | 1.0 m above the front beam |
| Length along the slope | (4.0 m + 0.24 m) × 1.031 = 4.37 m; 4.37 ÷ 0.219 = 19.96, round up to 20 steps | 20 × 219 mm = 4.380 m |
| Sheets across the patio | (6.0 m + 2 × 0.3 m) ÷ 0.96 = 6.9, round up | 7 sheets, covering 6.72 m |
| Running metres | 7 × 4.380 m | about 30.7 m |
| Roof area | 6.72 m × 4.380 m | about 29.4 m² |
| Purlin rows | One every 3 tile steps (660 mm) or every 2 steps (440 mm) | about 8 rows, or 11 at 440 mm |
| Screw sets with ASA caps | 29.4 m² × 4 – 5 per m² | about 120 – 150 |
| Edge pieces | Wall flashing at the house, eave sealing tile at the front | 6.72 m of each |
| Skylight | 5 – 10% of 29.4 m² | about 1.5 – 3 m² |
| Sheet weight | 29.4 m² × 5.4 kg | about 160 kg |
Thirty-odd metres is a tiny share of a 40 ft container, which holds about 5,000 m of sheet, enough for roughly 160 patios of this size. A homeowner therefore buys through an Australian dealer or patio builder who imports by the container and mixes colours and accessories in one load.
Can I use it on bushfire-prone land or in a cyclone region?
Not without a certifier's approval, and in most of those cases the answer will be no. Bushfire-prone land is assessed for a Bushfire Attack Level (BAL), and cyclone wind regions need roofing with tested wind performance. Santiago publishes no BAL, fire, cyclone, wind or hail rating for this sheet and holds no AS/NZS certification for it.
So the tile sheet is for sites where your builder or certifier accepts it: a patio, pergola or alfresco roof outside those zones. Whether a patio needs council or certifier approval depends on your council, so ask before the frame goes up.
White cottage with blue tile roof and timber deck, Vietnam
How does the patio builder fix the sheets?
Purlins go less than 700 mm apart: 440 or 660 mm for the tile sheet, with one purlin under the foot of a tile step. On a gable patio the top purlin sits 15 – 18 cm below the ridge so the ridge cap has something to screw into. Pre-drill 6 mm holes, then drive 70 mm screws through the top of the wave over a purlin, 4 – 5 sets per m², each with an ASA cap. Never screw in the valley, where the water runs, and lap each sheet over the next by one wave.
Where a skillion meets the house, vertical wall flashing closes the gap; along the low edge an eave sealing tile closes the open ends of the tiles. Santiago supplies the sheets and accessories and sends installation videos to your builder; it does not install. Every lot ships with a quality certificate (CQ), and the factory works under ISO 9001:2015 certificate ICI-23087.D.
Importing into Australia under CPTPP
Australia and Vietnam are both CPTPP members, so the sheet (HS 3925.90.00) can come in at a lower or zero duty under Australia's own CPTPP schedule, with proof of origin from Santiago for each container. Your customs broker confirms the rate, and an importer can ask customs for an advance ruling on classification and origin before the first shipment.
White cottage with dark tile roof in a garden, Vietnam
What does a tile-sheet roof look like over an outdoor dining area?
Mr Quyen presents, in English, a restaurant in Da Nang, Vietnam, roofed with red Santiago ASA/PVC tile sheets and filmed from a drone. The video also shows red, blue and navy tile samples on a wooden shelf and a house with a blue tile roof.
A restaurant roof in Da Nang with Santiago ASA/PVC tile sheets (Santiago video on YouTube).
Short videos for outdoor living areas in Australia
Two short clips in English, filmed by Santiago. Tap a video to play it here on the page.
How do tile sheets look on roofs in strong sun?
The short follows Santiago sheets from real roofs back to the factory: red tile sheets on a house, a quick flame test on the stack, a blue warehouse roof being fitted and grey sheets on the roller line.
Santiago PVC roofing tiles in real conditions (Santiago video on YouTube).
What does a tile sheet look like up close?
Filmed inside the Santiago factory: a worker steps onto a white tile sheet, red and blue sheets get a torch test, and the last scene is the team beside an export container.
Santiago tile sheets at the factory (Santiago video on YouTube).
CPTPP: lower import duty on roofing sheets made in Vietnam
Vietnam is one of the 12 member countries of the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), together with Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore and the United Kingdom. Santiago ASA/PVC roofing sheets and accessories are made in Vietnam (HS 3925.90.00), so buyers in these countries can claim the CPTPP preference when they import them.
- Lower or zero import duty. Each member cuts its tariffs on goods of Vietnamese origin under its own CPTPP schedule, and many tariff lines are already at 0%. Your customs broker confirms the rate that applies to HS 3925.90.00 on the day of import.
- Proof of origin with every container. Santiago prepares the CPTPP origin documents for each shipment, so the importer can claim the preferential rate at clearance.
- Advance rulings. Under CPTPP, an importer can ask its customs authority for a written ruling on tariff classification and origin before the goods ship, so the duty is known before the order is confirmed.
- Faster, more predictable clearance. CPTPP members commit to publish their customs rules and, where possible, to release goods within 48 hours of arrival.
- The same preference on every repeat order. As long as the sheets are made in Vietnam and the origin documents are in order, each new container qualifies again.
Duty rates and paperwork change by country and over time: check the current rate and the proof-of-origin form with your customs broker before you order.
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
What is the minimum pergola roof pitch for a PVC tile sheet?
20%, about 11.3°. The tile sheet is laid between 20% and 45% (about 11° to 24°). On a 4 m deep skillion patio, 20% means the back beam sits 0.8 m higher than the front beam.
Is a PVC tile sheet patio roof cooler than metal?
In Santiago's tests the space under the tile sheet stays 6 – 8 °C cooler than under bare metal sheet, and rain noise is about 80% lower.
How many sheets does a 4 × 6 m patio roof need?
A skillion patio 6 m wide and 4 m deep at 25% takes 7 sheets of 4.380 m (about 30.7 running metres, 29.4 m² of roof), 120 – 150 screw sets, and 6.72 m each of wall flashing and eave sealing tile.
Can the tile sheet be used in a BAL or cyclone area?
Santiago publishes no BAL, fire, cyclone or wind rating and holds no AS/NZS certification for the sheet, so it is for sites where your builder or certifier accepts it, such as patios and pergolas outside those zones.
Is there an import duty saving under CPTPP?
The sheet is made in Vietnam under HS 3925.90.00 and can get a lower or zero duty under Australia's CPTPP schedule with proof of origin from Santiago for each container. Your customs broker confirms the rate.
Read more
- Santiago heat, noise and corrosion tests
- Skylight roofing sheets: profile and how many
- Eave sealing tile vs wall flashing
- PVC roofing sheet colours
- ASA/PVC roof tile sheet
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.
