Comparing plastic sheets: multiwall sheets, corrugated sheets and hollow-chamber sheets

Plastic sheets are very popular in modern construction, especially for private and commercial outdoor projects. They offer a cost-effective, durable and easy-to-process solution for numerous applications. Compared with glass, they are more shatter-resistant, lighter and usually easier to install.

But not every plastic sheet is the same: the differences between multiwall sheets, corrugated sheets and hollow-chamber sheets are decisive for subsequent functionality and durability. In this article you will learn which variant is particularly suitable for which use.

What are multiwall sheets?

Multiwall sheets consist of at least two parallel layers of plastic connected by vertical webs. This structure forms air-filled chambers, which provide good thermal insulation. The sheets are light, stable and available in various designs – from a simple two-wall variant to more complex multi-chamber systems.

They are particularly common in transparent or opal variants, meaning they offer both light transmission and UV protection. Preferred materials include polycarbonate, which is particularly impact-resistant, or acrylic glass (PMMA), which stands out for its high optical clarity.

Advantages of multiwall sheets:

• Good thermal insulation thanks to the hollow structure
• High stability at low weight
• UV-resistant and light-transmitting (depending on material)
• Ideal for patio roofs, conservatories, carports

What are corrugated sheets?

Corrugated sheets are characterised by their distinctive corrugated shape, which is reminiscent of classic roof sheets made of metal or fibre cement. They are usually made from transparent or light-transmitting plastic such as PVC, acrylic or polycarbonate.

The corrugated structure gives the sheets high rigidity while keeping weight low. Particularly noteworthy is the easy drainage of water along the corrugation channels, which makes them the ideal choice for pitched roofs. Due to their low material thickness, they are usually cheaper than other plastic sheets, but they offer less protection against temperature loss.

Advantages of corrugated sheets:

• Inexpensive to purchase
• Quick and straightforward installation
• High resistance to weather
• Optimal for simple roof structures, sheds, canopies

What are hollow-chamber sheets?

Hollow-chamber sheets are a further development of the classic multiwall sheet and are characterised by an even more complex internal structure. Depending on the design, they have several parallel chambers, crosswise arranged webs or honeycomb patterns, which further increase stability and thermal insulation.

These sheets are used above all where high demands are placed on insulating performance, light transmission and mechanical load-bearing capacity. Compared with simple multiwall sheets, hollow-chamber sheets offer significantly improved temperature behaviour and are often the first choice for energy-efficient constructions.

Advantages of hollow-chamber sheets:

• Even better thermal insulation than simple multiwall sheets
• Reduction of condensation formation
• Also suitable for greenhouses or for light-transmitting façades

Material comparison: which plastic sheet for which purpose?

Criterion	Multiwall sheets	Corrugated sheets	Hollow-chamber sheets
Thermal insulation	Very good	Low	Excellent
Installation effort	Medium	Simple	Medium to high
Light transmission	High (depending on design)	Medium to high	High to very high
Price level	Medium	Inexpensive	Higher than multiwall sheets
Areas of use	Patios, carports	Sheds, canopies	Conservatories, greenhouses

When is which sheet worthwhile?

For simple roofing or canopies

Corrugated sheets are ideal when it needs to be quick, inexpensive and functional. Their simple handling and installation make them the preferred solution for sheds, canopies and temporary roofs.

For patio roofs and carports

Multiwall sheets offer a good balance of stability, light transmission and thermal insulation. They are durable, weather-resistant and therefore ideal for semi-transparent roofs on patios and carports.

For conservatories or highly insulating applications

Hollow-chamber sheets are used when insulating performance and light transmission are the priority. Thanks to their complex internal structure, they are particularly efficient at saving energy and offer a high mechanical load-bearing capacity – perfect for conservatories, light-transmitting façades and greenhouses.

In conclusion

Choosing the right plastic sheet depends heavily on the intended use. Multiwall sheets and hollow-chamber sheets score with their insulating effect and are ideal for demanding applications. Corrugated sheets, by contrast, impress with simple handling and price advantages. Anyone planning for the long term and valuing energy efficiency should opt for hollow-chamber sheets. For short-term, functional uses, corrugated sheets are usually entirely sufficient.