What is Werbar?

Werbar is a PVC reinforcement product designed for use in certain parts of a PVCu window and door. It will improve WER ratings and reduce U-values because it has thermal advantages over steel and aluminium reinforcements. Whilst it’s not designed for use in all applications, Werbar is ideal in many others. A generous wall thickness enables us to achieve screw retention values superior to the thermal inserts that have recently flooded the market. In our opinion a window made from a hybrid of steel and Werbar is the optimum solution.

  • Cost Savings



    In some instances, it is possible to save significantly on glass costs because of the improved thermal performance of Werbar over steel reinforcement. This can be especially relevant for 60mm or 3 chambered systems. Whether you want an A-Rated product or if you would rather your C rated window achieved a B rating, Werbar will in all instances give a better performance over aluminium and steel reinforcements. It is important that you use Werbar responsibly and follow your system suppliers reinforcement instructions (for the mullion and sash verticals) for instance.


    The pricing of steel reinforcement is unstable. Who can forget the 60% – 80% rises that we saw with steel prices in 2007 and 2008 and 19% so far in 2010. Werbar is price stable and will not see those types of price fluctuation.


    Werbar is significantly easier to handle than steel or aluminium. Werbar can be cut on a normal PVCu saw and is clean, light and easy to handle and without sharp edges and burrs.


    Werbar is quickly and easily secured in place with normal PVCu screws.

  • Recycled


    Werbar is manufactured from 100% recycled material and the majority is actually old first generation post-consumer PVCu windows. Hence this product significantly enhances your products green credentials by re-using old windows in the next generation of energy efficient windows.

    The UK produces approx. 500,000 tonnes of PVC per annum.

    Get behind products that are made from recycled PVC.

  • Weight

    Werbar weighs significantly less that steel. This means that your frames will be lighter and easier to handle.

  • Thermal Conductivity

    Heat Loss

    Werbar is an excellent insulation material. It has a thermal conductivity value of 0.17 W/m2K compared to steel 50 W/m2K and aluminium 160 W/m2K. The higher the figure the greater the heat loss. You can clearly see how Werbar offers the potential of improved WER’s (Window Energy Ratings) or reduce U-Values over comparative windows with steel or aluminium reinforcing. Use Werbar where you don’t need steel for deflection purposes and you will have a more energy efficient window.

  • Installer Friendly

    Installer Friendly

    Installers will appreciate lighter products that are easier to handle and easier to drill into when fixing. Drilling an average of six to eight 10mm holes in each door through steel reinforcement is time-consuming. Similarly, when joining conservatory frames or fixing into cills, you can fire self tapping screws through without pre-drilling. Drilling steel uses a large amount of consumables and generates swarf that can mark, stain and rust.

    Screw Retention.

    The generous wall thickness of Werbar means that screw retention properties are good. We have a growing list of companies that have passed enhanced security tests.

  • The Werbar Effect


    It is possible to improve your WER rating by around 7 points (ratings improve in bands of 10) KWh/m2/year on the WER scale, when compared to a window fully reinforced with steel. In U-Value terms, Werbar will reduce your U-Value and help you achieve the 1.6 m2K compliance. Partially replace steel with PVC reinforcing for a great balance between thermal efficiency and deflection performance. Window Widgets can simulate your specific frame combination to demonstrate the efficiency of Werbar and how you may be able to achieve a high WER rating with lower specification glass for example.

    In many cases, add Werbar to your frame (with steel in the mullions) and you can chnage Softcoat to K or Argon to air or WarmEdge to aluminium Spacer and be part L compliant (even for 3 chambers).

  • Engineered Shapes

    Werbar is an extruded product and so we have been able to design clever, profile hugging shapes that steel reinforcement cannot replicate. A generous 3.5mm minimum wall thickness combines with a coarse screw pitch to give superior screw retention than achieved by commonly used thin steel sections.


    Werbar can be inserted into the profiles and then cut and welded in the same operations as your frame and sash. This gives the benefit of a completely reinforced door with additional weld strength. This gives superior strength to the door thus helping to prevent cracked welds and dropping sashes. A further cost saving is that the reinforcement can be routed at the same time as your profile routing, thus you save on the pre-prepped steel cost. Doors are quicker and easier to fit with Werbar in the frame!

    1.8 Part L Compliance

    Werbar will help you achieve the October 2010 Part L 1.8 W/m2K. If you use conventional door panels then it is highly likely that you will struggle to achieve this value with a door fully reinforced with steel or aluminium. If you are using composite doors then call us and find out why 3 of the largest manufacturers are already using Werbar.