Mr Quyen - Santiago. Posted 13/11/2026
Santiago ASA/PVC roofing sheets contain no metal, so a barn, stable or implement shed on a lifestyle block gets a roof that cannot rust, at about 5.4 kg per m² for the tile sheet. A 9 × 7.2 m gable barn takes 20 tile sheets of 4.161 m, about 80 m² of roof. Santiago has no condensation data, so ventilation is for your builder to design; the sheets can be imported through Auckland or Tauranga under CPTPP.
Timber building with grey tile roof among pines, an installer on a ladder, Vietnam
What goes wrong with old iron roofs on a lifestyle block?
On a few hectares the roofs are usually a mix: a barn that came with the property, a stable, an implement shed and a chicken house built over a couple of weekends. The older metal roofs give trouble where water and dirt sit: at the laps, around nail holes, and where hay, manure or fertiliser bags have been stored against them. Rust starts there and spreads, and the roof leaks onto exactly the things the shed was meant to keep dry.
Santiago's sheets have no metal in them, so there is nothing to rust. They are four co-extruded layers with no glue: an ASA top layer, virgin PVC, a PVC core and a milky-white PVC base, made from virgin material. The ASA 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. The warranty is 10 years for 2.5 mm and thicker sheet installed as Santiago recommends.
Barn, stable, implement shed or chicken house: which sheet goes where?
| Building | Sheet that usually fits | What to plan |
|---|---|---|
| Barn near the house | Tile sheet in a colour that goes with the house | Ridge cap and ridge terminals in the same colour |
| Stable | Tile sheet or corrugated sheet | Skylight sheets on 5 – 10% of the roof for daylight; ventilation designed by the builder |
| Implement shed | 5-wave (1.00 m cover) or 6-wave (0.95 m cover) corrugated | Purlins less than 700 mm apart across the whole span |
| Chicken house | Tile or corrugated sheet | Small roofs are cut from the same sheet; ventilation designed by the builder |
| Hay or feed store | Corrugated or tile sheet | Keep the slope at 20 – 45% so water runs off |
All profiles come in 2.5 or 3.0 mm, with 2.5 mm the minimum for a roof. Standard colours are dark grey, red, blue, orange and chocolate; green, white and purple are made to order. A 2.5 mm corrugated sheet weighs about 5.2 kg per running metre.
Timber building with tile roof among trees, Vietnam
Will the barn roof drip with condensation?
Santiago has no test data on condensation under its sheets, so this article will not promise anything either way. Condensation in a barn or stable depends on the animals, the moisture in the building, the air flow and the weather, and controlling it through ventilation, gaps at the eaves and ridge, or a lining is the builder's job. If condensation has been a problem in your existing shed, raise it with the builder before you choose any roof.
What Santiago does publish: the space under the sheet stays 6 – 8 °C cooler than under bare metal sheet, and rain noise is about 80% lower (Santiago tests). In a stable during a downpour, the second figure is easy on the horses. A dark underside can be made to order if you would rather not see the milky-white base from inside.
How many sheets does a 9 × 7.2 m barn need? A worked example
Take a gable barn 9 m long and 7.2 m wide, ridge along the length, roof slope 30% (about 16.7°), with a 0.35 m overhang at each eave and 0.2 m at each gable end.
| Step | Working | Result |
|---|---|---|
| Ridge height above the eaves | 3.6 m half-width × 30% | about 1.08 m |
| Length along the slope | (3.6 m + 0.35 m) × 1.044 = 4.12 m; 4.12 ÷ 0.219 = 18.8, round up to 19 steps | 19 × 219 mm = 4.161 m |
| Sheets per face | (9.0 m + 2 × 0.2 m) ÷ 0.96 = 9.8, round up | 10 sheets, covering 9.60 m |
| Sheets for the roof | 10 × 2 faces | 20 sheets, about 83 running metres |
| Roof area | 9.60 m × 4.161 m × 2 | about 80 m² |
| Purlin rows per face | One every 3 tile steps (660 mm) or every 2 steps (440 mm) | 8 rows, or 11 at 440 mm |
| Screw sets with ASA caps | 80 m² × 4 – 5 per m² | about 320 – 400 |
| Ridge | Length of the ridge | 9.60 m of ridge cap and 2 ridge terminals |
| Eave sealing tile | Both eaves | 2 × 9.60 m |
| Skylight sheets | 5 – 10% of the roof | about 4 – 8 m² |
| Sheet weight | 80 m² × 5.4 kg | about 430 kg |
Skylight sheets let through 80 – 90% of the light. For a stable, a run of them over the aisle gives daylight without turning the whole roof into a glasshouse.
Fixing to timber or steel purlins
Purlins go less than 700 mm apart, at 440 or 660 mm, with one under the foot of each tile step; the top purlin sits 15 – 18 cm below the ridge so the ridge cap can be screwed down. Pre-drill 6 mm holes and 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 into the valley, and lap each sheet over the next by one wave. Older barns with wide purlin spacing need extra purlins before the new roof goes on; your builder checks the rafters at the same time.
Timber houses with grey tile roofs, Vietnam
Consent, wind and fire: what Santiago does not claim
Santiago publishes no wind, snow-load, fire or hail rating for these sheets and has no NZ Building Code or BRANZ certification. Check with your council whether your barn or shed needs consent, and let your builder decide whether the sheet suits an exposed site.
Importing through Auckland or Tauranga under CPTPP
New Zealand and Vietnam are both CPTPP members, so the sheets (HS 3925.90.00) can enter at a lower or zero duty under New Zealand's 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 first.
How does a lifestyle block owner order?
The minimum export order is one 40 ft container, about 5,000 m of sheet, which would roof about 60 barns like the example. Tile and corrugated profiles, colours and accessories can be mixed, and production takes about 5 days. A lifestyle block owner normally buys through a rural merchant or builder who imports; samples are free, with the buyer paying the courier. Every lot ships with a quality certificate (CQ), and the factory works under ISO 9001:2015 certificate ICI-23087.D. Santiago supplies sheets and accessories and sends installation videos; it does not install.
Timber pavilion frame with tile sheets stacked on the floor, Vietnam
Why are metal roofs hot and loud, and what changes with a tile sheet?
Mr Quyen holds a white tile sheet in the Santiago factory in Vietnam and explains in English, with captions, why bare metal roofs are hot, noisy in rain and costly to repair. The short then moves to 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).
More shorts for lifestyle blocks in New Zealand
Two short clips in English, filmed by Santiago. Tap a video to play it here on the page.
Can a tile sheet be cut to size on a rural build?
A 45-second factory short: beige and orange ASA/PVC sheets are flexed by hand and cut with shears to show how the material behaves. On a roof, purlins still go less than 700 mm apart.
Bending and cutting test on Santiago ASA/PVC sheets (Santiago video on YouTube).
What do Santiago sheets look like at the factory?
A short factory clip: a white tile sheet takes a worker's weight on the floor, a torch is aimed at red and blue sheets, and the Santiago team lines up in front of a 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 plastic roofing suits a barn on a lifestyle block?
Santiago ASA/PVC sheets in tile or corrugated profile, 2.5 mm minimum. They contain no metal, so they cannot rust, and the tile sheet weighs about 5.4 kg per m² of roof.
Do PVC roofing sheets cause condensation in a barn or stable?
Santiago has no condensation data for its sheets. Condensation depends on the animals, moisture and air flow, so ventilation is for your builder to design.
How many sheets does a 9 × 7.2 m barn need?
A gable barn at 30% slope takes 20 tile sheets of 4.161 m (about 83 running metres, 80 m² of roof), 320 – 400 screw sets and 9.60 m of ridge cap.
What purlin spacing do the sheets need?
Less than 700 mm: 440 or 660 mm for the tile sheet, one under the foot of each tile step, with the top purlin 15 – 18 cm below the ridge and a slope of 20 – 45%.
Can the sheets be imported into Auckland or Tauranga under CPTPP?
Yes. With proof of origin from Santiago for each container, the sheets (HS 3925.90.00) can get a lower or zero duty under New Zealand's CPTPP schedule. Your customs broker confirms the rate.
Read more
- Roof tile accessories checklist
- Skylight roofing sheets: profile and how many
- Santiago order checklist
- Santiago export markets and certificates of origin
- 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.
