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Lonsdale Roofing

Aluminium Rafter Glazing Bars for Glass and Timber

ThermGard-R Rafter Glazing System

Glazing Bars for Timber Rafters

  • Suitable for Double or Single Glazing
  • Electric or Manual Ventilators Available
  • Integral Drainage Channels Prevent Leaks
  • Combination of Natural Beauty and Warmth

​ThermGard-R aluminium glazing bars for timber rafters provide the ideal combination of the natural beauty and warmth of timber inside a weather-tight, maintenance free external finish. The carrier rail features integral drainage channels to ensure in the unlikely event that water penetrates the capping and high-performance gaskets, it is safely transported to the outside of the building. A continuous screw on pressure plate with provides outstanding glass retention and a choice of decorative external covers are available to provide either contemporary glass roof appearance or a more traditional heritage style for roof lanterns on period buildings. See here for typical hardwood conservatory details [1] [2].

  • ThermGard-R Rafter Glazing Bars

    Call 0208 801 4221 For a Competitive Quote or Email info@lonsdalemetal.co.uk

    We offer stock lengths or a design and fabrication service with all materials, pre-drilled, cut to size complete with all necessary fittings and fasteners ready for immediate installation.

The Importance Of Glazing Bars

Incorporated across multiple structures including conservatories, carports and greenhouses, glazing bars play a pivotal role in providing essential support to glass or polycarbonate panels. They require robust strength to bear substantial weight, high levels of durability and must be resilient against adverse weather conditions such as heavy wind and water. 

By carefully considering these factors, you can ensure that you will not need frequent replacements and this will contribute to the long-term reliability and safety of the overall installation.

Rafter Supported Or Self Supported?

When dealing with a timber frame that you can screw into, you should consider opting for rafter-supported glazing bars. However, when connecting multiple panes, self-supported should be utilised as they do not require a timber frame in order to install. 

ThermGard-R Rafter Glazing Bars

Plastic Or Aluminium?

You have the option to purchase glazing bars made of either plastic or aluminium, both of which boast rust-resistant properties and a long-lasting lifespan.

Plastic bars are inexpensive and are well-suited for multiwall polycarbonate installations. They offer ample strength to support the structure’s weight, and their affordability is attributed to the fact that it is made out of plastic. 

In contrast, if your installation involves solid polycarbonate or glass panels, it is advised to opt for sturdier aluminium glazing bars. Despite its lightweight nature, aluminium is remarkably tough and durable, ensuring it can withstand any additional weight and any unfavourable weather conditions. 

Enquire Glazing Bars From Lonsdale Metal

Integral to the structural composition of a conservatory, carport, or any similar structure, glazing bars play a vital role in reinforcing rigidity and ensuring overall structural integrity. To guarantee a precise fit, it is essential to select the right size and style of glazing bars, while also considering any necessary additional components such as end caps. 

For further details on our range of glazing bars and associated products, feel free to contact us today at 0208 801 4221 or via email at info@lonsdalemetal.co.uk.


“We’ve fitted ThermGard-R glazing bars time and again and like all Lonsdale products, we have never been let down” John Robinson, Robinson Glazing Services

  • Durable maintenance free polyester powder coated finish.
  • Suitable for double or single glazing.
  • Continuous thermally broken aluminium base bar, screw on pressure plate & external snap on cover.
  • Electric or manual ventilators available.
  • Integral drainage channels & high performance gaskets provide maximum weather-tightness.
  • Robust glass stop prevents glass slippage.


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