With the amendment to the national building regulations and to satisfy SANS XA and SANS 204, our love for massive windows to showcase our magnificent views is posing some interesting challenges. As windows transfer heat/cold over 10 times more than typical wall structures, and conventional doors struggle to keep the south easter/winter storms out, it makes sense to look at fenestration as it impacts the energy usage in buildings.
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Lets face it, no one wants to compromise on their light or view, so one way to comply is to use more efficient glazing materials. Whilst researching what the rest of the world has been doing for decades and on a recent visit to the UK I rediscovered uPVC (unplasticised Polyvinyl Chloride). I say “rediscovered uPVC” as it is not what I remembered and things have definitely improved.
Thermal Properties – Without a doubt there are clear thermal advantages to using uPVC, as the solar heat gain coefficient and thermal transmittance U values are far superior to aluminium, steel and in most cases timber (depending on the type of timber used). What this translates to are warmer houses in winter and cooler houses in summer, plus larger glazing areas (keeping your precious view) that comply with the regulations. uPVC prevents thermal bridging so prevents condensation unlike aluminium.
Cost – Some installation quotes have been cheaper but majority of quotes have been a bit more than timber and aluminium. However, it’s a bit like comparing apples and oranges. One thing that is sure enough is that in the long term the uPVC will give greater savings due to the energy efficiency, low maintenance and durability properties. House value increased in overseas markets and there is no reason why the same is not true here with the installation of uPVC.
Maintenance – A clear winner above aluminium, steel and timber. uPVC never rots, flakes, rusts, fades, pits, peels or corrodes. uPVC needs only a light soapy wash and a check of the seals for maintenance. Aluminium can scratch and chip on the surface coating leading to exposed damage, where uPVC typically has colour all the way through its profile so any scratches aren’t noticeable and it is tough on impact. Wood is becoming a gamble as to find good quality hardwoods is extremely difficult or expensive. The less dense woods of today need to be maintained almost annually and many people forget to factor scaffolding, pest control and wood treatment costs at their peril.
Expertise – Most uPVC suppliers both manufacture and instal, so cost is reduced and you have a better chance of getting the expertise to achieve what you want. Although uPVC is “new” to the SA market, it has been used worldwide for over 50 years and we are benefitting from the technological advancements over the years. The chance of receiving quality goods and service( as well as after sales service) greatly increases as you are utilising a one stop shop.
Aesthetics – This used to be a big disadvantage for uPVC as the look and quality used to be poor, with discolouration, cracking and poor UV ratings; but no more. With colour stabilisers, laminates and the ability to spray the frame with technology borrowed from the automotive industry; wood grain texture and any colour imaginable are now possible. This is such an advantage to extensions of older houses, as otherwise to match new timber to the old timber is extremely difficult and costly. An added bonus is the recent ability to have a different look internal to external, so it can fit into the look of the street while inside it can be as individual as your taste dictates. Nice.
Environmental impact – uPVC has minimal impact all the way through its life cycle. With PVC being the worlds 2nd most widely used plastic material, this non hazardous material recycles, so only 2 % found in waste stream. It is made from salt (from sodium chloride; chlorine is extracted) and oil (ethylene) so it has a relatively low embodied energy (1/3 of aluminium). Also in the pretreatment of aluminium many toxic chemicals are used throughout the process where this is not the case for uPVC. Tropical hardwoods are struggling to be sustainable, where all German uPVC is totally recyclable by law. Another consideration is uPVC lesser weight, making less transport costs.
Chemical resistance - uPVC is a stable material so is pollution, sea water resistant and chemical proof. This makes for greater ageing resistance compared to the other fenestration types. Wood can swell and rot and aluminium and steel can corrode and have galvanic reaction to the fasteners.
Fire resistance – Fire tests have shown that uPVC materials, being naturally flame retardant throughout their product life, will not cause, support or enhance the development of accidental fire and are in fact self-extinguishing.
UV Sunlight – uPVC is sensitive to UV and oxidative degradation and this was one of its major disadvantages. Technological advances have addressed this problem by adding anti-oxidants and other stabilisers. To check this ask for the specification and UV warranty. The reason most uPVC colour is white is because it aids reflection of UV, thereby reducing heat build up. Wood, steel and aluminium are also affected by UV and regular maintenance must be done to combat the ageing effect of the sun.
Water tightness and soundproofing – With uPVC unit being fuse welded all around it is sound, wind and rain sealed, unlike aluminium and wood which are mitre joined at the corners. These mitre joints are areas of weakness as the frame sections move to accommodate wind loads, climate expansion and contraction. With wood warping and swelling over time, air infiltration and reduced energy efficiency occurs.
Security – uPVC is reinforced with galvanised steel so as strong as other types of frames. Similar to the other types, added security features can be incorporated in the glazing. The uPVC profile can be made to have continuous beading on the outside unlike aluminium beading, which if know what to do can pop off glazing in seconds. With uPVC’s multipoint–tilt and turn hardware can change the sash window to a 10 degree tilting vertical window. This opening is secure whilst allowing ventilation.
Hardware (locks and handles) – There are many different types, quality, cost, aesthetics similar to the other types of fenestration so ensure the specification matches what you require. A big selling point for uPVC’s is the multipoint–tilt and turn hardware as gives the option to change from a sash window to a vertical tilting window.
Custom built – uPVC is manufactured to custom size so easy to replace existing retro fits to any shaped openings and can be profiled to Architects or clients pleasing shapes. To match existing cottage pane, the profile can be placed in-between the double paned glass to get similar look. Also in-between the glass a moving blind can be placed to help control the sun.
Regulation and quality – A word of caution, just like wood, glass, steel and aluminium; uPVC has varying quality depending on the class and specification. Depending on the company profile, steel reinforcing, fittings and hardware could be either German, Turkish, Chinese or Indian or a mixture of them all. This impacts greatly on quality and price ( up to 40 % more) so relate it to worldwide spec EN and compare warranties.
With 3/4 of all new windows in Europe and USA reportedly being uPVC, the rise in popularity of uPVC is sure to happen here in South Africa. This should further reduce pricing and increase quality and expertise. Talking to suppliers, architects and clients about uPVC generates a great positive response, and it’s refreshing to be part of the solution.
by Mathew Streatfield
Are you in the process of selecting windows for your home and are torn between UPVC and aluminum? It can be a difficult decision. There are many pros and cons of aluminum windows and UPVC windows.
This article will provide you with an in-depth comparison of the two, discussing factors such as durability, maintenance, energy efficiency, and aesthetics. This will allow you to make an informed decision on which type of windows to choose.
Want more information on uPVC Profile Manufacturer? Feel free to contact us.
Let the professionals at Lesso guide you in choosing between aluminum and UPVC windows for your home. With their expertise, they can help you make an informed decision based on your specific needs and preferences. Contact LESSO today for expert advice and ensure you select the perfect windows for your home.
UPVC windows, or un-plasticized polyvinyl chloride windows, are made from a rigid and durable material. The UPVC window frame is constructed using this material, which offers excellent resistance to rot, corrosion, and termite damage.
Made with UPVC windows material, these types of frames are known for being low maintenance, resistant to moisture, and able to withstand harsh weather conditions. It’s a reliable and long-lasting option for window frames in residential homes.
Aluminum window frames are a popular choice for homeowners. These windows are constructed using lightweight aluminum as the primary material for the frames. With their sleek and modern appearance, aluminum-made windows can enhance the overall aesthetic of any space.
There are many pros and cons of these types of windows to consider. It is worth noting that they may require periodic maintenance, particularly in coastal areas, to prevent corrosion. Despite this, their many benefits make them a sought-after choice for those looking for both style and durability in their windows.
Both types of windows are utilized in various applications, each offering distinct advantages. UPVC windows are commonly found in residential properties, as they provide excellent thermal insulation, soundproofing, and low maintenance requirements. They are particularly suited for homes in moderate climates.
On the other hand, aluminum windows are frequently employed in commercial buildings and contemporary architectural designs. Their strength, sleek appearance, and resistance to harsh weather conditions make them a popular choice for modern structures where durability and aesthetics are paramount.
When it comes to having choices, both UPVC and aluminum windows offer a range of options to suit different needs and preferences. A UPVC window frame can come in various colors and finishes, allowing for customization and seamless integration with the home’s design.
Aluminum window frames, on the other hand, provide versatility with sleek profiles and large glass areas, enabling expansive views and maximizing natural light. Whether you prioritize customization or modern aesthetics, both materials offer choices to match your desired style.
When considering the environmental impact, UPVC windows and aluminum windows have distinct characteristics. They offer a relatively low carbon footprint, as they are energy-efficient in terms of insulation, reducing heating and cooling demands. They are also recyclable, making them a sustainable choice.
Aluminum window frames, while also recyclable, require more energy during production and have a higher carbon footprint. However, aluminum is a highly durable material that can last for decades, potentially offsetting its initial environmental impact over its lifespan. Balancing energy efficiency and recyclability, both options offer environmentally friendly aspects to consider.
When it comes to strength, aluminum windows have the advantage. Aluminum is a robust material known for its structural integrity and ability to withstand various external forces. It is highly resistant to impacts and provides enhanced security. UPVC windows, although durable, are not as strong as aluminum.
However, UPVC windows can still offer sufficient strength for residential applications. The choice between the two materials depends on the specific strength requirements of the project and the level of security desired.
When it comes to insulation, UPVC windows outperform aluminum. UPVC has excellent thermal insulation properties, creating a barrier that helps to prevent heat transfer and maintain a comfortable indoor temperature. This insulation capability helps to reduce energy consumption for heating and cooling purposes, resulting in potential energy savings.
In contrast, aluminum is a conductor of heat and cold, making aluminum-framed windows less effective at insulation. Additional measures such as thermal breaks and double glazing can be incorporated in an aluminum window frame to improve their insulation, but UPVC inherently provides better insulation performance.
Regarding security, both types of windows can provide adequate protection, but aluminum windows are generally considered to be more secure. Aluminum is a robust material that offers excellent resistance against forced entry. Additionally, aluminum windows can be fitted with multi-point locking systems and reinforced glass for enhanced security.
While UPVC windows are also secure, aluminum frames are often preferred for commercial buildings or areas where added security is a primary concern. However, it’s important to note that the overall security of windows depends on factors like quality of hardware, installation, and additional security measures implemented.
Soundproofing is another thing to consider when comparing different window frames. UPVC windows offer better insulation against noise compared to aluminum ones. The inherent properties of UPVC, such as its density and ability to create a tight seal, make it effective at reducing external noise infiltration.
This is especially beneficial for homes located in busy areas or near sources of noise. While aluminum window frames can still provide some level of sound insulation, they are not as effective as UPVC in blocking out unwanted noise. To further enhance soundproofing, double-glazing or laminated glass can be incorporated into both UPVC and aluminum frames.
For more information, please visit uPVC Door Profiles.