Understanding uPVC Window Profiles and Key Technical Terms

Author: Shirley

Jun. 16, 2025

Hardware

Understanding uPVC Window Profiles and Key Technical Terms

What is a uPVC window profile & other technical window questions?

Posted by Peter Knox

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October 9,

Windows

uPVC windows are a cost-effective, durable, and thermally efficient option for your home. When we start to uncover the benefits of uPVC window profile, it’s not hard to understand why it’s one of the most commonly used materials for windows in homes across the UK. It’s worth understanding how the modern innovations of uPVC work and how they offer so many benefits to homeowners. Here, we’ve answered some of the more technical questions on uPVC windows to provide an insight into exactly what makes it such a tremendously popular material choice.

What is a uPVC window profile?

uPVC is an abbreviation for unplasticized polyvinyl chloride and it begins life as a plastic powder. It is then heated up and injected into a mould in order to form its shape as a strip of extremely long uPVC window profile. Once the uPVC has cooled, it is then cut and prepared to be assembled, along with other components, into what we recognise as a double or triple glazed window.

How do uPVC windows work?

uPVC frames for double and triple glazed units work by being made up of multiple chambers of air within the frame. The use of these multiple chambers allows more heat to be trapped within the frame resulting in improved thermal efficiency for your home. Thermal efficiency describes how effective a particular material is as a heat insulator and is measured in the energy in Watts (W) lost per square meter of the material (m2). This provides us with a U-Value. The lower the U-value, the better, as this means less heat is passing through your window frames. This will help to keep your energy bills down as you will need to spend less on heating your home.

What styles of uPVC window profiles are there?

There are three main types of uPVC window profiles and they are described as ovolo, chamfered, and flush.

Ovolo window profiles are ideal for a timeless, traditional look with sculptured framing and rounded edges to the windows. It’s a style that is popular for period style homes or those looking to put lots of character into their windows, such as properties with a modern country home aesthetic. It’s a popular choice thanks to its decorative finish, creating an elegant curved shape with soft sightlines.

Chamfered window profiles, on the other hand, provide a sleek, classic, look for modern windows. This profile is defined by its neat, linear, appearance, creating a stylish feel wherever it is used. The flat edges have a more contemporary feel than ovolo designs. The chamfered designs still have a traditional and familiar look, just one that is more contemporary and less decorative than ovolo frames.

Flush casements windows are a timeless, elegant window solution, characterised by sleek window lines that fit flush into the window frame, unlike stormproof windows that overlap in the frame. When closed the window sash is level with the outer frame creating smooth and even external contours.

What are the benefits of uPVC windows?

uPVC windows are low maintenance

One huge benefit of choosing uPVC profiles is that once you’ve had your windows installed, you won’t have to worry about maintaining them. uPVC window profile is made from a non-corrosive material that only needs a little wipe down every now and again with a damp cloth to keep it looking as good as new. Timber windows, despite their natural beauty and charming aesthetic, are prone to rot and warping due to their cellular makeup and will need regular treating, painting, and cleaning. This is something you will never have to worry about again after investing in uPVC windows.

uPVC windows can be totally personalised to your taste

Our uPVC windows are available in a huge range of colours including the popular Chartwell Green, Dark Red, and Anthracite Grey. We also offer wood-effect finishes, such as Irish Oak, which resemble traditional timber windows. With this option, you don’t have to compromise on aesthetics to obtain the modern innovations of uPVC. You can also choose the dual colour option to let the interior of your windows match your home’s décor whilst the outside of the frame beautifully compliments your home’s exterior.

uPVC windows are exceptionally energy efficient

Double or triple glazed uPVC windows will make a noticeable difference to the comfort of your home, reducing heat loss, and keeping it warmer and more insulated. In accordance with regulations, replacement windows must achieve an energy rating of C or above, and we are extremely proud to say that our windows offer up to an A+ energy rating.

We also inject the gap between our double or triple glazing panes with argon gas. Argon gas slows the transfer of heat through windows and doors. Since it is so viscous, it acts as a fantastic thermal barrier. Molecular movement is extremely restricted within the gas, so less heat is transferred and far less heat loss occurs.

uPVC windows are extremely secure

Our uPVC windows come with effective locks that will ensure your home is protected against intrusion. Internally beaded, our windows are resistant to forced entry and won’t let you down. The beading refers to the part of the frame holding the glass in place and is usually a plastic strip at the edge of the glass which snaps securely into the recess. One of the biggest advantages of internal beading is that there is very little risk of it being removed from the outside. In order to remove the beading, an intruder would have to smash the glass and reach in, most likely disturbing you or possibly triggering an alarm in the process. You can rest assured that all of our windows have been rigorously tested to provide the best defense for your family.

For more information, please visit 60mm uPVC profile.

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What types of uPVC windows do we offer?  

Suitable for both modern and traditional homes, our uPVC windows are available in a range of styles including casement, tilt & turn, sash, and custom shaped.

You can have almost any glass design for your windows, including leaded or Georgian bars and stained glass to enhance a more heritage look. We also offer a large variety of customisable hardware so you can create the windows of your dreams. With multipoint locking systems, traditional handles, and sash horns available, it’s easier than ever to create your perfect windows. You can view all of our window glass, colour, and hardware options in our brochure.

A uPVC window installer you can trust

Albany is a trusted local double glazing company with more than 20 years’ experience improving homes across Gloucestershire. We use only the best uPVC window profile and offer quality uPVC windows at a great value with a very high standard of workmanship, and we pride ourselves on our customer satisfaction.

If you would like to talk to us about your uPVC window replacements, or any of our other products, please get in touch with our dedicated team today on 511 384 or visit us in or showroom.

What You Need to Know About Window Frame Thickness

When choosing new windows for your home, one aspect that is often overlooked is the thickness of the window frame. Whether you’re renovating a period property or installing modern aluminium windows in a contemporary space, frame thickness plays a crucial role in window performance.

It affects everything from energy efficiency and durability to aesthetics and compliance with building regulations. This guide will walk you through the key considerations when choosing the right window frame thickness for your residential property.

What Are the Different Window Frame Options?

Window frames come in various materials, each with standard thickness ranges that influence their performance. Some of the most common materials include:

uPVC

  • uPVC windows are popular in the UK due to their affordability, low maintenance, and energy efficiency. The thickness of uPVC frames typically ranges from 60mm to 80mm. BSF Windows offers a selection of uPVC frames, with features like multi-chambered profiles for better thermal insulation, making them an ideal choice for homeowners looking to reduce their energy bills.

Aluminium

  • Aluminium window frames are known for their sleek, slim profiles and strength. These frames are thinner compared to other materials, with thicknesses ranging from 70mm to 85mm. This slimline design allows for more glass and natural light while maintaining durability. BSF Windows provides premium aluminium windows, engineered with thermal breaks to improve energy efficiency.

Timber

  • Timber frames are a traditional option that adds warmth and charm to period or traditional properties. These frames are generally thicker, ranging from 75mm to 95mm, due to the natural properties of wood. Timber windows at BSF are crafted with sustainable materials and provide superior insulation and durability, making them a perfect fit for those looking to maintain a classic aesthetic.

Each material has unique benefits in terms of energy efficiency, security, and style. When choosing window frames, it’s important to consider how the thickness of the frame will complement the overall look and function of your property.

What Are the Benefits of Each Window Frame?

uPVC Windows

uPVC frames are known for their energy efficiency and cost-effectiveness. The thicker the uPVC frame, the better its insulation properties, helping to reduce energy bills and keep your home comfortable throughout the year. With a range of styles and finishes available at BSF Windows, you can choose frames that complement your home’s aesthetic while ensuring excellent performance.

Aluminium Frames

Aluminium window frames offer slim profiles that provide sleek, clean lines and modern appeal. Despite their thinness, aluminium windows are strong and durable, offering high levels of security and resistance to weathering. The thickness of aluminium frames can be tailored to suit your energy efficiency needs, with thermal breaks designed to prevent heat loss.

Timber Windows

Thicker timber frames not only provide exceptional insulation but also offer a timeless look for traditional properties. With natural insulating properties, timber windows can reduce energy consumption and help maintain a comfortable indoor environment. BSF Windows’ timber frames are designed for long-lasting performance, ensuring they remain a beautiful and functional part of your home for years to come.

Which Frame Material is More Energy Efficient?

When considering window frame thickness and energy efficiency, it’s important to look at the material used. uPVC and timber frames generally provide the best thermal efficiency due to their insulating properties.

  • uPVC frames: These often feature multi-chambered profiles, which trap air and create an effective barrier against heat loss. uPVC windows from BSF Windows are designed to meet the highest energy standards, reducing your home’s carbon footprint and energy bills.
  • Aluminium frames: Although aluminium is a conductor, modern designs incorporate thermal breaks within the frame, improving their energy efficiency. BSF’s aluminium windows are engineered for optimal insulation, making them an excellent choice for contemporary properties.
  • Timber frames: Wood is a natural insulator, making timber frames one of the most energy-efficient options available. At BSF Windows, our timber windows combine traditional craftsmanship with modern energy-saving features, ensuring your home remains warm in winter and cool in summer.

For homes in Surrey, Sussex, and the surrounding areas, where climate control is crucial, choosing a thicker frame with superior insulation properties can make a noticeable difference in both comfort and energy costs.

Are There Building Regulations for Certain Window Frames?

In the UK, window installations must comply with Building Regulations, particularly in terms of energy efficiency, safety, and ventilation. Frame thickness plays a part in meeting these standards, particularly when considering factors like window energy rating (WER) and thermal efficiency.

  • Energy Efficiency: Building regulations require that all new windows meet a minimum energy efficiency standard. This includes specific U-values, which measure how well a window prevents heat from escaping. The thickness and material of the window frame will impact this rating. Thicker, insulated frames will typically offer better U-values, ensuring compliance with regulations.
  • Safety: For certain installations, such as those in upper floors, thicker frames may be required to accommodate safety glazing or boosted locking systems. BSF Windows offers windows designed to meet or exceed safety standards, giving you peace of mind along with energy savings.

How to Choose the Right Thickness for Your Project

Choosing the right window frame thickness depends on several factors, including your property’s location, the style of your home, and your specific needs. For example:

  • Weather: In areas prone to colder winters or hotter summers, thicker frames with better insulation will provide year-round comfort. Double or triple glazing paired with a thicker frame can offer superior thermal efficiency, reducing heat loss and lowering your energy bills.
  • Aesthetic Appeal: If you’re renovating a traditional property, you might prefer timber frames, which tend to be thicker. For modern homes, aluminium frames offer a sleek look with their slimline design.
  • Security and Durability: Thicker frames often mean stronger windows, particularly when it comes to materials like timber or aluminium. Whether you’re looking to improve the security of your home or ensure long-lasting durability, BSF Windows provides a range of options designed to meet your specific requirements.

Measuring Frame Thickness and Understanding Manufacturer Specifications

When comparing window frames, it’s important to understand the manufacturer’s specifications. The thickness of the frame will usually be listed in millimeters, and it’s worth measuring the existing frames in your home to ensure compatibility with new installations.

At BSF Windows, our experts can guide you through the process, helping you choose the right frame thickness for your property. Whether you’re opting for our uPVC, aluminium, or timber windows, we’ll ensure your new windows meet both your aesthetic and functional needs.

Choose BSF Windows for all Window Frames

Now that you have a better understanding of window frame thickness and its impact on energy efficiency, security, and aesthetics, it’s time to take the next step. Contact BSF Windows today to discuss your project, visit our showroom, or request a free, no-obligation quote. Our team of experts is here to help you choose the perfect window frame thickness for your home, ensuring you get the best performance and style.

Transform your home with high-quality, energy-efficient windows from BSF Windows. Visit us online or get in touch with our team for more information.

Want more information on 70mm uPVC profile for windows? Feel free to contact us.

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