Mr Quyen - Santiago. Posted 13/11/2026
For houses and pavilions by rivers and the sea in Brunei, a Santiago ASA/PVC tile sheet has no metal to rust in salty, humid air and weighs about 5.4 kg per m², a light load for a timber frame on posts over water. A 6 × 4 m riverside pavilion takes 14 sheets of 2.847 m, about 210 kg of sheet, fixed with 70 mm screws and ASA caps through the top of the wave. The sheets come from Vietnam and can enter Brunei with an ASEAN Form D or under CPTPP.
House with a tile roof beside a large pond, Vietnam
What do salt air and river damp do to a roof?
Houses on stilts in Kampong Ayer, homes along the rivers and houses near the coast all live in air that is wet most of the day, and near the sea it carries salt as well. Metal roofing suffers first where water sits longest: at the laps between sheets, around screw holes and along the eaves. Once rust opens a hole there, the leak usually shows up inside before anyone sees it from outside.
A Santiago tile sheet has no metal in it, so the sheet itself has nothing to rust. Its smooth ASA surface sheds rain water quickly. The parts that still need thought are the frame and the screws, which the next sections cover.
Why does roof weight matter on a timber frame over water?
A house or pavilion over water stands on posts, and every kilogram on the roof goes down through those posts into the river bed or the bank. A lighter roof leaves the frame more margin. The Santiago tile sheet weighs about 5.4 kg per m² at 2.5 mm, far lighter than clay or concrete tiles. Your builder or engineer still checks the frame, the posts and the bracing against wind, because Santiago publishes no wind rating for the sheet.
| Part | What to plan |
|---|---|
| Sheet | 2.5 mm minimum for a roof; about 5.4 kg per m² |
| Purlins | Less than 700 mm apart: 440 or 660 mm, one under the foot of a tile step; top purlin 15 – 18 cm below the ridge |
| Slope | 20 – 45% |
| Fixing | 6 mm pre-drilled holes, 70 mm screws through the top of the wave over a purlin, 4 – 5 sets per m², never in the valley |
| Screw heads | ASA caps in the roof colour over every screw |
| Side lap | One wave |
| Edges | Eave sealing tile at the eaves, vertical wall flashing where the roof meets a wall |
On timber purlins, a screw holds only as far as the wood around it is sound. Replace soft or split timber before the roof goes on, and choose screws suited to a salty site with your installer.
House with a brown tile roof by the water, Vietnam
How many sheets for a 6 × 4 m riverside pavilion? A worked example
Take an open pavilion 6 m long and 4 m wide on a timber platform by the river, with a gable roof. The ridge runs along the 6 m side, the slope is 40% (about 22°), the eaves overhang 0.5 m and each gable end overhangs 0.3 m.
| Step | Working | Result |
|---|---|---|
| Ridge height above the eave line | 2.0 m half-width × 40% | about 0.8 m |
| Face length along the slope | (2.0 m + 0.5 m) × 1.077 | about 2.69 m |
| Sheet length | 2.69 ÷ 0.219 = 12.3, round up to 13 steps; 13 × 219 mm | 2.847 m (the extra 15 cm goes into the eave) |
| Sheets per face | (6 m + 2 × 0.3 m) ÷ 0.96 = 6.9, round up | 7 sheets, covering 6.72 m |
| Sheets for the roof | 7 × 2 faces | 14 sheets, about 40 running metres |
| Roof area | 6.72 m × 2.847 m × 2 | about 38 m² |
| Purlin rows per face | One every 3 tile steps (660 mm) or every 2 (440 mm) | about 5 rows, or 7 at 440 mm |
| Screw sets with ASA caps | 38 m² × 4 – 5 per m² | about 155 – 190 |
| Ridge and eaves | Ridge length and both eaves | 6.72 m of ridge cap, 2 ridge terminals, 2 × 6.72 m of eave sealing tile |
| Sheet weight | 38 m² × 5.4 kg | about 210 kg |
Importing roof sheets into Brunei: Form D or CPTPP
Brunei and Vietnam are both in ASEAN and in CPTPP, so the sheets (HS 3925.90.00) can enter with an ATIGA Form D or a CPTPP proof of origin, provided by Santiago for each container. Your customs broker chooses the route and confirms the rate. A single pavilion is usually bought through a Bruneian dealer or builder, since the minimum export order is one 40 ft container of about 5,000 m.
What upkeep does the roof need by the water?
Rinse off salt, leaves and bird droppings with fresh water now and then, keep the gutters clear, and look over the ASA screw caps after a big storm. There is no paint to renew, because the colour sits in the ASA layer, which showed no colour change after 2,000 hours of artificial UV and is rated for 30 years. Real roofs last 25 – 30 years, and the warranty is 10 years for 2.5 mm and thicker sheet installed as Santiago recommends. Santiago supplies sheets, accessories and installation videos; it does not install. For colours and a full house example, see our article on atap rumah and house roofing in Brunei.
Why does a metal roof make a house hot and noisy in the rain?
A one-minute short with English captions: Mr Quyen compares metal and clay roofs with Santiago ASA/uPVC tile sheets, first in the factory and then on finished red and grey roofs.
Heat and rain noise: Santiago ASA/uPVC roofing explained (Santiago video on YouTube).
More shorts for houses by the water in Brunei
Two short clips in English, filmed by Santiago. Tap a video to play it here on the page.
How are tile sheets screwed down on a roof frame?
Mr Quyen holds a green ASA/PVC sheet at the factory, then climbs onto a grey tile roof that installers are still screwing down, and finishes on a completed grey roof beside the gutter.
Santiago uPVC tile roofs on site (Santiago video on YouTube).
What does the sheet look like on both faces?
A Santiago worker stands on a white tile sheet on the factory floor and a gas torch is pointed at red and blue sheets beside it. The short ends with the team in front of 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
Will a PVC tile sheet rust near the sea in Brunei?
The sheet has no metal in it, so it cannot rust. Cover every screw head with an ASA cap and choose screws suited to a salty site with your installer.
Is a PVC tile roof light enough for a house on stilts?
The sheet weighs about 5.4 kg per m² at 2.5 mm, far lighter than clay or concrete tiles. Your builder or engineer still checks the frame, posts and wind bracing, because Santiago publishes no wind rating.
How many sheets does a 6 × 4 m riverside pavilion need?
With a 40% gable roof, 0.5 m eaves and 0.3 m gable overhangs: 14 sheets of 2.847 m (about 40 m), 155 – 190 screw sets, 6.72 m of ridge cap and 2 ridge terminals; about 210 kg of sheet.
Can the sheets enter Brunei under CPTPP?
Yes. They are made in Vietnam and ship under HS 3925.90.00 with an origin document for each container; CPTPP and ASEAN Form D are both possible, and your customs broker confirms the rate. Importers can also ask customs for an advance ruling on classification and origin.
Read more
- A rust-free roof with ASA/PVC sheets and FRP purlins
- ASA screw caps and fixing on the top of the wave
- Eave sealing tile vs wall flashing
- Roofing for coastal homes in salty air
- ASA/PVC roof tile sheet
Versi Bahasa Melayu
Untuk rumah dan wakaf di tepi sungai dan laut di Brunei, kepingan atap genting ASA/PVC Santiago tiada logam yang boleh berkarat dalam udara masin dan lembap, dan beratnya kira-kira 5.4 kg bagi setiap m², ringan untuk rangka kayu di atas tiang. Wakaf 6 × 4 m di tepi sungai memerlukan 14 keping sepanjang 2.847 m, kira-kira 210 kg.
Kenapa bumbung rumah di tepi air cepat rosak?
Rumah bertiang di Kampong Ayer, rumah di tepi sungai dan rumah berhampiran pantai berada dalam udara lembap hampir sepanjang hari, dan di tepi laut udara itu masin. Atap logam berkarat dahulu di sambungan kepingan, di lubang skru dan di cucur atap. Kepingan Santiago tiada logam, jadi kepingan itu sendiri tidak berkarat, dan permukaan ASA yang licin cepat mengalirkan air hujan.
Rangka kayu, purlin dan skru
Rumah di atas air berdiri di atas tiang, jadi bumbung yang ringan memberi rangka lebih ruang. Tukang atau jurutera anda tetap perlu memeriksa rangka, tiang dan pengukuh angin, kerana Santiago tidak menerbitkan penarafan angin untuk kepingan ini.
| Bahagian | Cara pasang |
|---|---|
| Purlin | Kurang daripada 700 mm (440 atau 660 mm); purlin teratas 15 – 18 cm di bawah rabung |
| Kecerunan | 20 – 45% |
| Skru | Lubang 6 mm digerudi dahulu, skru 70 mm pada puncak gelombang di atas purlin, 4 – 5 set bagi setiap m², jangan di lurah |
| Kepala skru | Penutup skru ASA dalam warna bumbung |
| Tindihan sisi | Satu gelombang |
Laluan taman di tepi kolam dan rumah beratap genting, Vietnam
Gantikan kayu purlin yang lembut atau retak sebelum bumbung dipasang, kerana skru hanya sekuat kayu di sekelilingnya. Bincang dengan tukang anda tentang skru yang sesuai untuk kawasan masin. Untuk wakaf 6 × 4 m dengan kecerunan 40%: 14 keping sepanjang 2.847 m (kira-kira 40 m), keluasan kira-kira 38 m², 155 – 190 set skru dan 6.72 m penutup rabung.
Rumah di tepi kolam dengan rangka bumbung baharu, Vietnam
Import ke Brunei dan penjagaan
Kepingan ini dibuat di Vietnam dan boleh masuk ke Brunei dengan Borang D ATIGA atau bukti asal CPTPP yang disediakan Santiago untuk setiap kontena; ejen kastam anda mengesahkan kadar duti. Untuk penjagaan, bilas garam dan daun dengan air bersih sekali-sekala, bersihkan longkang atap dan periksa penutup skru selepas ribut. Tiada cat yang perlu diperbaharui kerana warna berada dalam lapisan ASA.
Soalan lazim
Adakah kepingan PVC berkarat di tepi laut?
Tidak. Kepingan ini tiada logam. Tutup setiap kepala skru dengan penutup ASA dan pilih skru yang sesuai untuk kawasan masin bersama tukang anda.
Sesuaikah untuk rumah bertiang di atas air?
Beratnya kira-kira 5.4 kg bagi setiap m² pada ketebalan 2.5 mm. Tukang atau jurutera anda tetap memeriksa rangka, tiang dan pengukuh angin.
Adakah Santiago memasang bumbung?
Tidak. Santiago membekalkan kepingan, aksesori dan video pemasangan dari Vietnam; pemasangan dibuat oleh tukang anda.
Sources for the figures in this article
- Profiles, 2.5–3.0 mm thickness and 10-year warranty: Santiago ASA/PVC product specification.
- 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.
