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Corrugated Sheets

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Corrugated roof sheet panels are a type of roofing sheet, typically made of thin, flexible sheets of Bitumen, resin, metal, concrete or PVC that are formed into a wave-like pattern. The corrugated design provides increased strength and durability, making  them ideal for use in harsh weather conditions. Easy installation and excellent water & corrosion resistance, makes corrugated roof sheeting a popular choice for both residential and commercial roofing applications. Available in a range of colours, profiles and materials and can be customised to fit any roof size or shape.

Advantages of Corrugated Roofing

Corrugated sheets are in widespread use in both domestic & commercial applications, thanks to their numerous advantages.

Strong & durable

Corrugated roofing is very strong, thanks to the design, making it much stronger than the “flat” versions of the underlying material.

Impact resistant

The corrugated design has the effect of increasing the surface area of the sheet, thus dissipating the forces in the event of an impact.

Lightweight construction

Panels can weigh as little as 5kg, making them suitable for use on lightweight framed structures. Plus they are easy to handle and transport.

Choice of colours & profiles

Sheets are available in many different profiles from the normal curved profile to box profile and metal sheets can be supplied in many different colour coatings, giving a huge range of aesthetic choice.

Low pitch

Some types of sheet can be laid to a pitch as low as 5 degrees, giving them an advantage in situations where a low pitch roof is required.

Long Life Span

Depending on the material and use, sheets can have a lifespan of between 10 -40 years.

Low maintenance

Many types of corrugated roofing require very little maintenance, making them an ideal choice for domestic outbuildings & commercial buildings alike.

Low prices

With easier installation comes reduced installation costs, on top of a competitive cost per square metre for the sheets themselves. This makes it a good value for money choice overall.

Easy Installation

Compared to roof tiles, large areas of corrugated sheeting can be installed far quicker and easier. Technically theta re easier to install too, which should reflect in the overall cost.

Types of corrugated roof sheets

Bitumen Resin Sheets

We stock the Corrapol range of bitumen resin corrugated roof sheets, complete with all fixings and trims, in a wide range of colours.

Manufactured from a mixture of bitumen and polymers durable, they provide a waterproof surface for flat and low-slope roofs, giving excellent resistance to UV rays, chemicals, and weathering.

Fibre Cement Sheets

We stock Eternit Profile 6 fibre cement sheets that are commonly used in agricultural buildings, complete with all fixings, clear panels and accessories

Manufactured from Portland cement mixed with natural and synthetic fibres, they combine strength with good insulation characteristics. They also help prevent the build up of condensation in storage sheds and factories.

Galvanised Steel Sheets

We supply galvanised corrugated profile sheets, which are a popular replacement for the old corrugated iron sheets. A durable and corrosion resistant roof panel made from zinc coated steel to protect against rust and weather damage.

PVC Corrugated Sheets

We supply Corrapol clear PVC corrugated sheets as well as Corrapol Stormroof higher specification sheets.

Corrapol Stormroof is manufactured from plastic resin, making them 200 times stronger than glass, and virtually unbreakable. They age exceptionally well - not going brittle or yellow over the years like some sheets do. They have an estimated lifespan of 25 years.

New: Shed roofing kits

We now supply Swift Watershed shed roof kits, in a range of different sizes, giving a complete kit of all parts required to re-roof a shed.

Corrugated Roof Sheet FAQ

How much should corrugated roof sheets overlap?

In general, a 150mm overlap is recommended for roofs of 10 degree pitch and 300mm is recommended for 5 degree pitches. However, always refer to manufacturers guidance as individual roof sheet types may vary.

What spacing should joists/purlins be when corrugated sheeting is used?

While this can differ depending on manufacturers advice, a good rule of thumb is that roof purlins should be spaced no further than 1.2 metres apart when using sheeting with a thickness of 0.7mm, and 1 metre when using 0.5mm sheeting.

What lengths do corrugated sheets come in?

Lengths vary depending on the material but as a guide:

  • Galvanised sheets are 1.825m long (14 ft)
  • PVC corrugated sheets come in 1.0m, 2.0m, 2.5m & 3 m length
  • Corrapol Stormroof comes in a range of sizes including 1.82m, 2.44m, 3.05m, 3.6m
  • Fibre cement sheets come in many sizes starting at 1.22m tthrough to 3.05m.
  • Bitumen resin sheets are available in 1m & 2 m lengths

How long do corrugated roof sheets last?

Lifespan varies depending on the material, use, location and other factors but sheets such as Corrapol Stormroof have a projected lifespan in excess of 20 years, while Eternit Profile 6 cement fibre sheets can last in excess of 50 years.

How do I install corrugated roof sheets?

Installation is straightforward and varies depending on the sheet type, but generally sheets are fixed to purlins that run at 90 degrees to the direction of the slope. Sheets must be overlapped (normally 150mm but 300mm is required on low pitches of 5 degrees). Sheets are fixed with screws or bolts to the purlins (profiled filler pieces being used to support the sheet), and edges can be finished with suitable trims.

Can corrugated roof sheets be used on curved roofs?

Some sheets such as galvanised steel and coated steel might be suitable for a gentle curve, but PVC and cement fibre are not flexible enough.

Are corrugated roof sheets fire-resistant?

Fire resistance varies by material. For instance, steel box profile & galvanised steel sheets are very resistant to the spread of fire. Nowadays,thanks to advances in material technology, even PVC sheeting such as Corrapol clear amber PVC roof sheet has excellent fire ratings.

How do I clean and maintain corrugated roof sheets?

Most sheets are self cleaning when fixed at a suitable pitch, but may need gentle sweeping periodically if there is a build up of dirt and debris (make sure to use crawling boards for support).

While today’s sheets are very durable , a yearly inspection will prolong the lifespan of your roof. Fixings should be checked and any damaged or loose should be replaced, as loose fixings can lead to damage during storms. Sheets should be checked visually for impact damage.