To count roofing sheets, divide the length of each roof slope by the sheet's effective width and round up, then order each sheet in the slope length plus overhang. For a shophouse roof 8 m long with two 4.5 m slopes using 11-wave sheets (1.0 m cover), you need 8 sheets per slope, 16 in total, each about 4.6 – 4.8 m long.
Step 1: choose the profile
| Profile | Effective width |
|---|---|
| 5 waves | 1.00 m |
| 6 waves | 0.95 m |
| 11 waves | 1.00 m |
| Roof tile | 0.96 m |
Santiago 11-wave ASA/PVC sheet
Step 2: count sheets per slope
Roof length 8 m ÷ 1.0 m = 8 sheets per slope. With 6-wave sheets it would be 8 ÷ 0.95 = 8.4, so 9 sheets.
Step 3: set the sheet length
Measure from ridge to eave along the slope (4.5 m) and add the eave overhang, for example 10 – 30 cm. Order one length per slope so there are no end laps.
Step 4: screws and ridge
Roof area 2 × 8 × 4.5 = 72 m². At 4 – 5 screw sets per m², order 290 – 360 sets. The ridge is 8 m long; with 0.96 m usable ridge pieces that is 9 pieces.
Importing to Laos? Delivery by truck from Vietnam, minimum one 40 ft load (about 5,000 m), production about 5 days, Form D included: importer and distributor guide.
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
How do I count roofing sheets?
Divide each slope's length by the sheet's effective width and round up.
Should sheets be overlapped end to end?
Avoid it where possible; order each sheet in the full slope length.
How many screws for 72 m² of roof?
290 – 360 sets at 4 – 5 per m².
Related products: ASA/PVC 5 waves · 6 waves · 11 waves · ASA/PVC roof tile · Skylight sheets
Contact Santiago: Santiago Import Export Co., Ltd, Vietnam. WhatsApp +84 935 391 495 (Mr. Quyen), hotline +84 965 437 316 (Mrs. Ly), email salessantiagoroofing@gmail.com.
Updated October 2026.
