Polycarbonate Twinwall

There are a number of benefits when comparing polycarbonate twinwall to glass. These include its lower cost, increased strength & durability being light in weight, it's great versatile material and protection against UV light. 

Regardless of the size of glazing you need, all of our polycarbonate twinwall sheets can be cut to size to make sure it’s the perfect fit for your roof or wall applications. 

Read on to find out more about this material, how it compares to multiwall and how it can work for you!

Why Use Polycarbonate Twinwall? 

Polycarbonate twinwall is made up of two layers of  plastic (polycarbonate) sheets which are attached together with a support layer which is made of plastic too. This adds strength  which means the sheet can support weight easily. In comparison, multiwall provides greater heat and sound insulation. 


Twinwall is a common alternative to glass due to this  stability and toughness - it’s very difficult to break, and as it is a clear material, it lets in a lot more light compared to multiwall, while  still protecting against UV light. Depending on the weather conditions, the material  is adaptable and can be flexible to work with this. 

What Are The Uses of Polycarbonate Twinwall? 

As a lightweight sheet made from extremely strong polycarbonate, with advanced thermal insulation, polycarbonate twinwall can be used for many common indoor and outdoor applications such as:


  • Secondary Glazing
  • Greenhouse Glazing
  • Shed Glazing 
  • Roofing Applications
  • Carports 
  • Conservatories 
  • Skylights 


If you have any questions about using it for a different type of structure, feel free to contact us

How Do You Fit Polycarbonate Twinwall?


If you are looking to use polycarbonate twinwall, you will need to know how to fit it. But don’t worry, it’s a very easy process. If the sheets are not already cut to size, it’s important that you use a fine tooth blade and cut it at room temperature. Without taking this under consideration, it may split if cut, especially in cold temperatures. You can choose to drill the material if you wish, but make sure you are careful when doing this. To join the sheets together, glazing bars are needed to attach between the sheets, which can be purchased to suit differing thicknesses. Make sure to fit the glazing bar onto wooden timber, as they do not support themselves. After fitting the polycarbonate twinwall to your structure it may require a good clean afterwards, with soap and water. 

What are the differences between Twinwall and Multiwall? 

Although multiwall does have similar properties, twinwall does offer a lower level of insulation as it’s slightly thinner in comparison to multiwall. Therefore, if you need to contain heat, multiwall is a better option. 


As polycarbonate twinwall is a generally thinner material, it’s best placed for structures such as greenhouses, cold frames and sheds. They are clear, lightweight and can bend (this will not damage the material) installing the material is a straightforward process.  Although the 4mm or 6mm sheeting is suitable for these structures, 10mm works effectively for carports, pergolas as well as sheds (if you need more insulation). Comparatively, multiwall sheeting in 25mm, 32mm, and 35mm thick, provides higher insulation and slightly more strength. 

Deciding between Twinwall and Multiwall depends on the needs of your project, the process and your budget. 


Chat with us now and we can answer any questions you need regarding your plastic needs!


Selecting Your Polycarbonate Twinwall Sheets With Sheet Plastics

If you are purchasing your polycarbonate twinwall from us, make sure to take into consideration the thickness and colour you need for your project. Our twinwall sheets hold excellent chemical resistance, are Class 1 fire rated, available in opal or bronze and are easy to handle and install.


They also have tape already fitted if they are 10mm or above in thickness, which is an anti-dust aluminum tape. We have six different thicknesses available: 


  • 4mm - Commonly used for safety barriers, wall cladding and greenhouse glazing. 
  • 6mm - Commonly used for safety barriers, wall cladding and greenhouse glazing. 
  • 10mm - Commonly used for smaller roofing projects such as carports and sheds.
  • 16mm - Commonly used for roofing projects such as carports and sheds. 
  • 25mm - Commonly used for roofing projects such as conservatories and greenhouses. 
  • 35mm - Commonly used for roofing projects such as conservatories and greenhouses. 

Sheet Plastics Are Here To Help

We have an excellent range of polycarbonate twinwall sheets available for any suitable indoor or outdoor use. Order with us for custom twinwall sheets which are cut to size for your structure. 


With our price match guarantee, you can feel confident in finding high quality polycarbonate twinwall at a great price. 


All of our friendly team at Sheet Plastics will be happy to help you choose from our range of twinwall polycarbonate sheets. For further details or to discuss your polycarbonate options, please get in touch. Call us on 01455 501 621 or email [email protected].