ASA PVC Roofing Sheet in the Philippines: typhoon fixing guide

ASA PVC roofing sheets for the Philippines: how to fix them for typhoons and salt air

13/05/2023

Mr Quyen - Santiago · Editor: Santiago Plastic Roofing · Updated 25/10/2026 · 3 min read

ASA/PVC roofing sheets from Santiago (Vietnam) do not rust in salt air and keep the space under the roof 6–8 °C cooler than galvanised iron (Santiago measurements). For typhoon-exposed roofs, set purlins at 440 mm rather than 660 mm, use 5 screw sets per m² with caps, and add extra screws along eaves, ridges and gable ends. Minimum order is one 40 ft container, about 5,000 m, with Form D.

Contents

1. Why salt air and typhoons change the choice
2. How do you fix the roof for typhoons?
Purlin spacing
Screws
Laps and direction
Frame
3. Profiles we ship
4. Test results
5. Ordering for Manila, Cebu or Davao
6. Frequently asked questions

Buod: Ang Santiago sa Vietnam ay gumagawa ng ASA/PVC roofing sheet na 4 na layer, hindi kinakalawang sa hangin ng dagat at mas malamig kaysa yero. Minimum na order ang isang 40 ft na container. WhatsApp +84 935 391 495.

1. Why salt air and typhoons change the choice

Many Philippine homes, resorts and farms sit close to the sea. Galvanised iron rusts first around screws and laps, and a rusted hole is where a typhoon gust starts lifting the sheet. ASA/PVC has no metal to corrode, so the fixing points stay sound year after year.

ASA PVC roof sheet in the Philippines — ASA/PVC roof sheets for the Philippines

2. How do you fix the roof for typhoons?

Loading an export container at the Santiago factory

Purlin spacing

Our general limit is under 700 mm, with 660 mm for normal sites. On coasts and hilltops facing typhoons, use 440 mm so every sheet has more fixing lines.

Screws

Use 5 screw sets per m² with ASA caps and rubber washers, plus extra screws along the eave line, ridge and gable ends where wind suction is highest.

Laps and direction

Lay sheets starting from the end away from the prevailing wind, so each side lap faces downwind.

Frame

The sheet is only as strong as the purlins and trusses; check that rafters are tied down to the walls.

4 layers of ASA PVC roofing sheet — ASA top layer with three PVC layers

Accessories of ASA PVC roofing sheet — Matching ridge, hip and trim pieces

3. Profiles we ship

Spanish tile (1.05 m wide, 0.96 m cover) for homes and resorts; 5-wave (1.08/1.00 m) and 6-wave (1.06/0.95 m) for farms and factories; 11-wave (1.05/1.00 m). Thickness 2.5 or 3 mm, length cut to order, 7 colours.

4. Test results

Tensile 25.7 MPa, flexural 51.6 MPa (Quatest); a loaded truck drove over a sheet.
0.02% mass change after 24 hours in 10% HCl.
About 80% less rain noise than metal; 30-year colour retention; 10-year warranty.

Advantages of ASA PVC roofing sheet — Main advantages of the sheet

Warehouse of ASA PVC roof sheets — Sheets in the warehouse

5-wave roofing sheet production line — 5-wave sheet on the line

5. Ordering for Manila, Cebu or Davao

Santiago is a Vietnamese manufacturer and a leading exporter of ASA/PVC roofing sheets (India 2023, Thailand 2024, United States 2025). One 40 ft container holds about 5,000 m and is ready in about 5 days. HS code 3925.90.00, Form D for ASEAN preference. FOB quote within 24 hours, CIF within 48 hours; free samples, buyer pays courier.