Unveiling the Advantages of Thermally Broken Frames: A Window into Energy Efficiency
Upon speaking with a builder whom I have a healthy working relationship with the other day, it struck me as a good topic to write a blog post about. His blatant unawareness of the importance of the frame that is coupled to the glass was staggering. I suppose this is something the whole industry experiences daily, so I hope this relatively summarised blog post helps some people understand the importance of not only the glass used, but also the frame the glass is sitting in.
As the demand for energy-efficient homes continues to rise, homeowners are increasingly seeking innovative solutions to enhance the thermal performance of their living spaces. One crucial aspect often overlooked in this pursuit is the choice of window frames. Double Glazing is often proclaimed as the solution, but the frames in which this glass sits in, are just as important. In this blog post, we delve into the world of windows, focusing on the significant benefits of thermally broken frames over their non-thermally broken counterparts. Additionally, we’ll explore the potential drawbacks of incorporating double-glazed glass into non-thermally broken frames, shedding light on the importance of making an informed decision for a more sustainable and comfortable home.
The Science Behind Thermally Broken Frames
To understand the advantages of thermally broken frames, let’s first determine what «thermal break» means, what constitutes a thermally broken frame and what constitutes a non-thermally broken frame as well as the types of frames that fit into each category.
The term «thermal break» refers to the interruption of thermal conductivity in the frame material, preventing the direct transmission of heat or cold from external elements. If a product were to fail to do this, it would be called a «thermal break».
Types of thermally broken frames
UPVC – unplasticized polyvinyl chloride
UPVC Window frames are designed with inherent thermal break benefits due to their composition and structure. Unlike traditional materials, uPVC possesses natural insulating properties, and when used in window frames, it inherently minimizes heat and cold transfer between the interior and exterior of a building.
Thermally Broken Aluminium
Unlike traditional non-thermally broken aluminium frames, which are typically made from a single material (aluminium), thermally broken frames consist of two materials (aluminium inside and outside) separated by an insulating barrier which is generally made of a substantially rigid, low thermal conductive polyamide or polyurethane material. This design prevents the transfer of heat or cold through the frame, reducing thermal conductivity and enhancing the overall energy efficiency of the window.
Timber
The cellular structure of timber acts as a natural thermal break, impeding the direct flow of heat or cold into the building envelope.
Types of non-thermally broken frames
Standard Aluminium
A standard aluminium window frame, being made only of aluminium and lacking a thermal break, presents inherent thermal conductivity challenges. Aluminium, being a highly conductive material, allows for the easy transfer of heat and cold, which can lead to significant energy inefficiencies in buildings.
Steel
Steel windows are a far more dense and heavy material but still have the exact same challenges as stated above with aluminium windows.
Advantages of Thermally Broken Frames
- Improved Thermal Insulation. According to a study conducted by the Australian Government’s YourHome resource, thermally broken frames can reduce thermal transfer by up to 50%, significantly enhancing thermal insulation and creating a more comfortable indoor environment for your home. This, coupled with the addition of tailored Double Glazed Units, will enhance the comfort (and aesthetics) of your home ten-fold.
- Energy Cost Savings. The Australian Window Association (AWA) estimates that investing in double glazed thermally broken frames can lead to energy cost savings of 40-70% annually. This substantial reduction in energy consumption is attributed to the frames’ ability to minimize heat loss or gain.
- Condensation Control: The CSIRO (Commonwealth Scientific and Industrial Research Organisation) underscores that thermally broken frames contribute significantly to condensation control, reducing the risk of moisture build-up on window surfaces by up to 70%.
Disadvantages of Double-Glazed Glass in Non-Thermally Broken Frames
- Reduced Effectiveness of Double Glazing. According to Fenestration Australia Association, non-thermally broken frames paired with double-glazed glass may experience a 30% reduction in the effectiveness of double glazing. This reduction is primarily due to increased thermal bridging through the frame.
- Increased Risk of Condensation. Fenestration Australia Association also reports that non-thermally broken frames with double-glazed glass are associated with a 20% higher incidence of condensation compared to thermally broken counterparts. This heightened risk can lead to issues such as mould growth, reduced visibility, and potential water damage to surrounding surfaces.
In the quest for energy-efficient homes, the choice of window frames plays a pivotal role. Thermally broken frames emerge as the superior option, offering quantifiable benefits such as a 50% reduction in heat transfer, 40-70% energy cost savings, and up to 70% reduction in condensation risk. Homeowners looking to maximize the benefits of double glazing should prioritize the integration of thermally broken frames to ensure a sustainable and comfortable living space. As the renowned architect Frank Lloyd Wright once said, «A building should have integrity just as a man should have integrity». In the realm of windows, integrity begins with the choice of thermally broken frames, paving the way for a brighter and more energy-efficient future.
Remember, the integrity of your windows starts with the right frame choice. Partner with a provider who understands and prioritizes these aspects. Contact us for a consultation to ensure you’re making the best choice for your home, steering clear of common mistakes and misinformation in the market.