- \n
- on the one hand, their production consumes resources,<\/li>\n
- on the other hand, they can significantly influence a building\u2019s energy consumption. <\/li>\n<\/ul>\n
So what is more sustainable?<\/strong> <\/h4>\n
Plastic, aluminum, or wooden windows? And is it better to build new homes or renovate older ones?<\/strong> We aim to outline the answers in this article.<\/p>\n
If you need advice from experts, <\/strong>get in touch with us<\/strong><\/a> and we will arrange a meeting in our showroom.<\/strong><\/p>\n
How Does the Window Material Affect the Carbon Footprint?<\/h3>\n
A carbon footprint includes a product\u2019s environmental impact throughout its entire life cycle\u2014from sourcing materials to disposal. To understand why sustainability matters in window manufacturing, we must look at the full life cycle of windows. It consists of 4 phases: <\/p>\n
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<\/p>\nPhase 1: Extraction and Production of Materials<\/h4>\n
PVC (plastic windows):<\/strong> made from petroleum-based products, which means high CO\u2082 emissions already during production.<\/p>\n
Wooden windows: <\/strong>if the wood comes from sustainably managed forests (FSC certification), it has a lower carbon footprint.<\/p>\n
Aluminum windows:<\/strong> bauxite mining and aluminum processing are very energy-intensive\u2014the production carbon footprint is the highest of all three materials. On the other hand, aluminum that has already been mined and processed can be recycled indefinitely without losing its properties. This makes it a favorite among recycled materials.<\/strong><\/p>\n
Phase 2: Transport and Installation<\/h4>\n
Local production and shorter transport distances = lower CO\u2082 emissions.<\/p>\n
Phase 3: Use and Energy Efficiency<\/h4>\n
The greatest environmental benefit of windows is their ability to save energy for heating and cooling.
Triple glazing and low-emissivity coatings can reduce a building\u2019s energy consumption by up to 30\u201350%, thereby helping reduce the window\u2019s overall carbon footprint.<\/p>\nPhase 4: End of Life Cycle \u2013 Recycling and Disposal<\/h4>\n
Rigid PVC from window frames can be recycled up to 7 times without loss of quality.
Recycled PVC is often layered into the core of profiles, while the outer part remains made of new material.
Wooden windows are biodegradable or can be burned with a minimal environmental footprint.
Aluminum windows have the advantage of full recyclability.<\/p>\nWhy Does PVC Have a High Carbon Footprint?<\/h3>\n
PVC (polyvinyl chloride) is a plastic material whose production is energy-intensive and dependent on fossil fuels. PVC\u2019s carbon footprint can be broken down into several key aspects: <\/p>\n
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<\/p>\nRaw materials: PVC is based on oil and natural gas<\/h4>\n
- \n
- PVC is made from ethylene<\/strong> (obtained from oil or natural gas) and chlorine (obtained through electrolytic processing of salt). <\/li>\n
- Oil and natural gas extraction is environmentally harmful<\/strong>\u2014not only due to high CO\u2082 emissions, but also due to deforestation and water and soil pollution. <\/li>\n
- Manufacturing process: High energy demand<\/strong>
Electrolytic production of chlorine (one of the basic components of PVC) is very energy-intensive and requires large amounts of electricity. CO\u2082 emissions from PVC production are higher than those from producing wood or recycled aluminum. PVC contains various additives and stabilizers (heavy metals, phthalates, flame retardants), which have an additional environmental impact. <\/li>\n- Limited number of recycling cycles <\/strong>
Although PVC is among the most recyclable plastics, its life cycle is not infinite. The material can withstand multiple recycling cycles\u2014often cited as up to 7\u2014but its properties change over time. <\/li>\n<\/ul>\nWhat Happens in Each Cycle?<\/strong><\/h4>\n
With each processing of PVC:<\/p>\n
- \n
- the polymer chains are disrupted (so-called degradation),<\/li>\n
- oxidation or yellowing of the material may occur,<\/li>\n
- small microscopic impurities or additive residues form that can no longer be fully separated.<\/li>\n
- even though stabilizers are typically added to PVC during recycling to preserve its properties, after a certain number of cycles it simply stops working at the required quality level (especially if the final product must be resistant to UV radiation, frost, or mechanical stress).<\/li>\n<\/ul>\n
And What About PVC That Can No Longer Be Recycled?<\/strong><\/h4>\n
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<\/p>\nWhen PVC is no longer suitable for further recycling:<\/strong><\/h4>\n
It is mechanically shredded and used as a filler in less demanding products (e.g., garden edging, industrial flooring, pallets).<\/p>\n
If it cannot be used even this way, the next step is:<\/p>\n
- \n
- Energy recovery\u2014i.e., controlled incineration in facilities that can filter out the harmful substances produced (e.g., hydrogen chloride).<\/li>\n
- Landfilling\u2014the least preferred method, which is being gradually restricted in the EU.<\/li>\n<\/ul>\n
A Contrast with Aluminum<\/h4>\n
- \n
- Aluminum can be recycled indefinitely without loss of quality.<\/li>\n
- Recycling aluminum requires only 5% of the energy compared to producing new aluminum.<\/li>\n<\/ul>\n
\u201cMore Eco-Friendly\u201d PVC <\/h4>\n
Nevertheless, SCH\u00dcCO is looking for solutions to mitigate the environmental impact of PVC profiles. SCH\u00dcCO PVC profiles are part of the VinylPlus program, which ensures efficient recycling of this plastic. <\/strong>Recycled material is used in profile production. Using recycled PVC reduces CO\u2082 emissions and contributes to the circular economy. These profiles offer the same insulating properties as non-recycled PVC, while reducing the burden on the environment. <\/p>\n
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Aluminum can be recycled indefinitely without loss of quality. Recycling aluminum requires only 5% of the energy compared to producing new aluminum. <\/p>\n<\/blockquote>\n
More about SCH\u00dcCO recycled solutions in <\/strong>this article <\/strong><\/a> <\/p>\n
Does Wood Still Have an Environmental Advantage Over Aluminum?<\/h3>\n
- \n
- For a wooden window to be truly eco-friendly, it should meet these criteria:
Certified wood from sustainably managed forests<\/strong>\u2014primarily FSC (Forest Stewardship Council) or PEFC (Programme for the Endorsement of Forest Certification).<\/li>\n- Local origin of the wood\u2014to minimize the transport carbon footprint (importing exotic wood is not eco-friendly).<\/li>\n
- Long service life and repairability\u2014high-quality workmanship extends the lifespan of windows.<\/li>\n
- Eco-friendly surface finishes\u2014natural-based coatings (e.g., oils, waxes, water-based varnishes).<\/li>\n<\/ul>\n
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<\/p>\nAre Wooden Windows in Slovakia Truly Eco-Friendly?<\/h4>\n
Not always! Many \u201cwooden windows\u201d may be: <\/strong><\/p>\n
- \n
- Made from uncertified wood (logging may be unsustainable).<\/li>\n
- Treated with synthetic coatings that are not eco-friendly.<\/li>\n
- Combined with plastic elements\u2014thereby losing their eco-friendliness.<\/li>\n<\/ul>\n
If you want truly eco-friendly wooden windows, you should ask about:<\/strong><\/p>\n
- \n
- FSC or PEFC certification.<\/li>\n
- The origin of the wood\u2014whether it comes from Slovakia or nearby countries.<\/li>\n
- Eco-friendly surface finishes\u2014e.g., natural oils instead of synthetic varnishes. <\/li>\n<\/ul>\n
Why Can Recycled Aluminum Be More Eco-Friendly Than Wood?<\/h3>\n
Although wooden windows are often considered eco-friendly, aluminum windows made from recycled aluminum can have an even lower carbon footprint<\/strong>, because:<\/p>\n
- \n
- They require no maintenance (coatings, impregnation)\u2014wooden windows must be repainted regularly, which increases the environmental footprint.<\/li>\n
- They have a longer service life\u2014high-quality aluminum windows last longer than wooden windows<\/strong>.<\/li>\n
- They are 100% recyclable<\/strong>\u2014wood does decompose, but manufacturing wooden windows often generates a significant amount of waste.<\/li>\n<\/ul>\n
Are Aluminum Windows Really Eco-Friendly? Facts and Myths <\/h3>\n
Aluminum has several key advantages over wood:<\/p>\n
- \n
- Weather resistance\u2014it does not warp, crack, or rot.<\/li>\n
- Virtually maintenance-free<\/strong>\u2014wood needs coatings and impregnation; aluminum does not.<\/li>\n
- 100% recyclability\u2014aluminum can be remelted indefinitely without loss of quality<\/strong>.<\/li>\n
- Long service life <\/li>\n<\/ul>\n
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<\/p>\nMyth: Aluminum Has a High Carbon Footprint<\/h4>\n
It is true that bauxite mining is demanding. BUT if recycled aluminum is used, energy consumption is reduced by up to 95% compared to producing new aluminum! <\/strong>Modern aluminum windows therefore have a lower environmental footprint than wood, if we focus on their life cycle and recyclability. <\/p>\n
\n
If recycled aluminum is used, energy consumption is reduced by up to 95% compared to producing new aluminum! Modern aluminum windows therefore have a lower environmental footprint than wood, if we focus on their life cycle and recyclability. <\/p>\n<\/blockquote>\n
- 100% recyclability\u2014aluminum can be remelted indefinitely without loss of quality<\/strong>.<\/li>\n
- They are 100% recyclable<\/strong>\u2014wood does decompose, but manufacturing wooden windows often generates a significant amount of waste.<\/li>\n<\/ul>\n
- For a wooden window to be truly eco-friendly, it should meet these criteria:
- Oil and natural gas extraction is environmentally harmful<\/strong>\u2014not only due to high CO\u2082 emissions, but also due to deforestation and water and soil pollution. <\/li>\n
- PVC is made from ethylene<\/strong> (obtained from oil or natural gas) and chlorine (obtained through electrolytic processing of salt). <\/li>\n
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<\/p>\n