Corrugated PVC Roofing Sheet: 5, 6 or 11 Waves?

Mr Quyen - Santiago. Posted 14/11/2026

Santiago makes three corrugated ASA/PVC roofing sheets: 5 waves (1.08 m wide, 1.00 m cover, 32 mm waves), 6 waves (1.06 m wide, 0.95 m cover, 34 mm waves) and 11 waves (1.05 m wide, 1.00 m cover, 20 mm waves). All are 2.5 or 3.0 mm thick, weigh about 5.2 kg per running metre at 2.5 mm and are cut to the length you order.

Aerial view of a blue roof on a garden house among trees, Vietnam

Aerial view of a blue roof on a garden house among trees, Vietnam

What is a corrugated PVC roofing sheet?

A corrugated PVC roofing sheet is a plastic sheet formed into a row of waves. The waves stiffen the sheet across its width and carry rain down to the eave. Santiago's sheets have square waves and are built from four co-extruded layers: ASA on top for UV and colour, then virgin PVC, a PVC core and a milky-white base. There is no metal in them, so there is nothing to rust.

The tile sheet and the corrugated sheets come from the same material. The difference is the shape, and the shape decides the look of the roof and how many sheets you need.

How do the 5, 6 and 11-wave corrugated plastic roof panels compare?

Profile	Full width	Cover width	Wave height	Feature
5 waves	1.08 m	1.00 m	32 mm	1 m of cover per sheet, so counting is simple
6 waves	1.06 m	0.95 m	34 mm	The tallest waves, for the most rain on long slopes
11 waves	1.05 m	1.00 m	20 mm	Low, close waves and a flatter look from below

The cover width is what matters for ordering. It is the width a sheet adds to the roof after it laps one wave over the sheet beside it.

Long green corrugated sheets with a stack of tile sheets beside them, Vietnam

Long green corrugated sheets with a stack of tile sheets beside them, Vietnam

Which profile suits a factory, a farm, a shed or a wall?

Building	Profile to look at first	Why
Factory or warehouse with long roof slopes	6 waves	34 mm waves carry the most water
Workshop, store or house extension	5 waves	1.00 m cover and a clean ribbed look
Poultry house, pig house or farm store	5 or 11 waves	No metal to rust; choose by the look you want under the roof
Garden shed or carport	11 waves	20 mm waves give a lighter, flatter look
Wall cladding next to a corrugated roof	Same profile as the roof	Same colour and the same lines

These are starting points. Santiago can send free samples of all three (the buyer pays the courier) so you can compare them on site before choosing.

How many corrugated plastic roofing sheets does a barn roof need?

Take a farm barn with a gable roof. Each roof face is 18 m long along the ridge and 5 m from ridge to eave, so the roof is about 180 m².

Profile	Sheets per face	Sheets for the roof	Running metres	Sheet weight at 2.5 mm
5 waves	18 ÷ 1.00 = 18	36	180 m	about 936 kg
6 waves	18 ÷ 0.95 = 18.9, round up to 19	38	190 m	about 988 kg
11 waves	18 ÷ 1.00 = 18	36	180 m	about 936 kg

The 6-wave sheet needs two more sheets on this roof because each one covers 5 cm less. Screws are the same for all three: 4 – 5 sets per m², so about 720 – 900 sets for 180 m². If the barn needs daylight, plan skylight sheets on 5 – 10% of the roof, which is 9 – 18 m² here; they let through 80 – 90% of the light.

Close-up of a white tile-profile sheet, Vietnam

Close-up of a white tile-profile sheet, Vietnam

Corrugated sheet or tile profile?

Point	Corrugated (5, 6, 11 waves)	Tile sheet
Look	Straight ribs	Rows of curved Spanish-style tiles
Cover width	0.95 – 1.00 m	0.96 m
Length	Cut to the length you order	Cut in 219 mm steps
Weight at 2.5 mm	About 5.2 kg per running metre	About 5.4 kg per m² of roof
Purlins	Less than 700 mm apart	440 or 660 mm, one under each tile step foot
Edge pieces	Ridge cap, wall flashing	Also eave sealing tile, hip ridge and junction pieces

Both carry the same ASA layer, the same 10-year warranty from 2.5 mm, the same 6 – 8 °C cooler result than bare metal sheet in Santiago's test, and about 80% less rain noise. Choose the tile sheet when the building is a home, a villa or a resort and the roof is seen from the street; choose a corrugated sheet when the building is a working space.

What do installers need to know about corrugated sheets?

Slope between 20% and 45%.
Purlins less than 700 mm apart, the top one 15 – 18 cm below the ridge.
Lap one wave sideways.
Pre-drill 6 mm holes and drive 70 mm screws through the top of the wave over a purlin, with ASA caps.
Never screw in the valley, where the water runs.

A teal corrugated factory roof with rows of clear skylight sheets, Vietnam

A teal corrugated factory roof with rows of clear skylight sheets, Vietnam

What does a corrugated 5-wave sheet look like coming off the line?

Mr Quyen walks through the Santiago factory in Vietnam and explains it in English: roof tiles and ridge pieces in the yard, a green 5-wave sheet coming off the line, a delivery truck, and the warehouses where a container is being loaded.

Inside the Santiago ASA/PVC roofing factory in Vietnam (Santiago video on YouTube).

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.

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 sizes do corrugated PVC roofing sheets come in?

Santiago's 5-wave sheet is 1.08 m wide with 1.00 m cover, the 6-wave 1.06 m with 0.95 m cover and the 11-wave 1.05 m with 1.00 m cover. All are cut to the length you order, 2.5 or 3.0 mm thick.

Which corrugated plastic roof panel is best for a long factory roof?

The 6-wave sheet, because its 34 mm waves are the tallest of the three and carry the most rainwater.

How many corrugated sheets do I need for a roof?

Divide the length of each roof face by the cover width and round up: 1.00 m for 5 and 11 waves, 0.95 m for 6 waves. An 18 m face needs 18 five-wave sheets or 19 six-wave sheets.