Multiwall sheets or glass? – A comparison for patios and conservatories
Multiwall sheets or glass? In our comparison, learn about the advantages and disadvantages of both materials for patios and conservatories – from light transmission to thermal insulation.
Anyone planning a roof for a terrace or conservatory quickly faces a fundamental decision: multiwall sheets or glass? Both materials are frequently used – but their properties, costs and aesthetic effect sometimes differ significantly.
While glass is known for its elegant and clear appearance, multiwall sheets impress with functional advantages such as thermal insulation and ease of installation. In this article you will learn which solution is best suited to your project, what to look out for when choosing, and how both materials compare directly.
What are multiwall sheets?
Multiwall sheets – also known as hollow-chamber sheets – are multiwall plastic sheets typically made of polycarbonate or acrylic glass. Between the outer layers are parallel webs that form several air chambers. These chambers give the sheet its characteristic insulating properties and at the same time ensure high stability at low weight. Due to their physical properties, multiwall sheets are a sought-after material in many areas such as greenhouses, carports, terrace roofs and conservatories. Their combination of robustness, UV resistance and value for money makes them an attractive alternative to glass.
Advantages of multiwall sheets
- Outstanding insulation: Thanks to the air chambers, multiwall sheets are particularly well suited to conservatories.
- Light and stable: Considerably lighter than glass, and therefore easier to install.
- UV-resistant: Special coatings protect against yellowing.
- Break-resistant: Polycarbonate sheets in particular are extremely impact-resistant.
- Cost-effective: Considerably cheaper than laminated or safety glass.
What speaks in favour of glass?
Glass has been a proven material for decades in the construction of transparent roofs and living-space extensions. Safety glass in the form of ESG (toughened safety glass) or VSG (laminated safety glass) in particular is frequently used for conservatories and high-quality terrace roofs.
Alongside its classic, crystal-clear aesthetics, glass scores with its durability, scratch resistance and ease of care. Especially when it comes to light-filled rooms with undistorted visibility, glass is the preferred material. From an architectural point of view too, glass offers many possibilities – from a minimalist look through to modern design accents.
Advantages of glass
- Elegant appearance: Glass looks high-quality, clear and lets through maximum light.
- Scratch resistance: Considerably more robust against scratches than plastic sheets.
- Easy to care for: Simple to clean and stays clear for a long time.
- Weather resistance: With the appropriate quality, it barely ages.
Comparison: multiwall sheets vs. glass
| Criterion | Multiwall sheets | Glass |
|---|---|---|
| Light transmission | High (but slightly diffuse light) | Maximum (crystal clear) |
| Thermal insulation | Very good thanks to air chambers | Moderate to good (with VSG) |
| Weight | Light | Heavy |
| Break resistance | Very high (especially polycarbonate) | High (with ESG/VSG), but glass breakage possible |
| Appearance | Technically modern, slightly milky | Clear, elegant |
| Installation | Simpler | More involved, often with a supporting structure |
| Cost | Lower | Higher |
Where are multiwall sheets particularly suitable?
Multiwall sheets are outstandingly suitable for projects where functionality, weather protection and cost-effectiveness are the priority. They are particularly recommended for terrace roofs where a pleasant indoor climate beneath the roof is desired – without heat building up too strongly.
They also show their strengths in unheated or temporarily used conservatories: the air chambers provide solid thermal insulation that saves heating costs and ensures a pleasant microclimate. In addition, multiwall sheets are ideal for carports, porches, pergolas or greenhouses, as they combine UV protection, break resistance and easy installation in one product.
When is glass the better choice?
Glass plays to its strengths above all when the visual impression and high transparency are the focus. Anyone who wants a seamless view of the sky, for example with a luxurious conservatory or an architecturally demanding terrace roof, will be significantly better advised with glass. Glass also blends more harmoniously into the overall picture for buildings with high design standards or listed properties.
For permanently heated conservatories, where long-term value retention also matters, glass is a high-quality choice thanks to its high resistance to ageing and weather influences – provided the higher weight and the installation effort are factored in.
In conclusion
Whether multiwall sheets or glass are the right choice depends on your priorities. Multiwall sheets impress with functionality, price and insulating performance. Glass, on the other hand, scores with aesthetics, light transmission and an elegant feel. Anyone who values budget, ease of installation and energy efficiency is well served by multiwall sheets. Anyone who prioritises uncompromising appearance and maximum light yield should go for glass.
Frequently asked questions (FAQ)
Are multiwall sheets also available in a clear version? Yes, there are clear variants with high light transmission. However, these are never quite as transparent as real glass.
How long do multiwall sheets last? With UV protection and good care, they can last 15 to 25 years or longer.
Do multiwall sheets need to be cleaned? Yes, ideally with water and a soft cloth. Avoid harsh cleaning agents.
Is a permit required for the roof? This varies from region to region. Ask your local building authority.
Which is cheaper: multiwall sheets or glass? As a rule, multiwall sheets are considerably cheaper, both in terms of purchase and installation.
