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Are sash windows energy efficient?

Are sash windows energy efficient?
Are sash windows energy efficient?
Tue Nov 9

With the growing demand for being environmentally friendly, you may be wondering what the best, most sustainable window options are for your next project.

Eco-friendly windows are beneficial both to the occupant of the building and the environment itself.

They help to reduce the over-use of resources and waste and also add to the comfort of the building.

Our recommendation for sustainable windows?

uPVC and timber sash windows.

To learn more about why timber and uPVC sash windows are some of the best, most sustainable window options, continue reading.

What determines a window’s sustainability?

If you’re not sure what exactly makes a window sustainable, we’ll fill you in.

Here are some things you can look for when choosing materials for your new windows:

  • Ethically manufactured and sourced
  • Energy efficiency
  • Durable and long-lasting
  • Lowers carbon footprint
  • Can be replaced or disposed of without ending up in landfills

Why are plastic windows not sustainable?

Most plastic windows are non-biodegradable and normally thrown into the landfill when they need to be replaced or removed.

Plastic windows can also release toxic fumes if burned.

Also, the manufacturing process for these windows is less environmentally friendly.

With timber and uPVC sash windows, this is not the case, which makes them the more sustainable options.

What makes timber sash windows sustainable?

You may be wondering, “How are timber sash windows sustainable if they are made out of trees?”

No need to worry – the FSC certification can help.

The FSC logo confirms that the materials used for the window have been sustainably sourced and helps the environment.

When looking for materials to source, see if the product has an FSC logo.

When timber windows are sourced from managed forests, when a tree is cut down to be used as materials, another tree is planted in its place.

In order to receive a FSC certification, a forest must be managed in an environmentally friendly way, helping to protect animals and plants and the sacred sites of indigenous people.

Additionally, using timber as a material will make windows more energy efficient as it has low thermal transmittance.

What makes uPVC sash windows sustainable?

uPVC, or Unplasticised Polyvinyl Chloride, does not contain phthalates or BPA, making it safe for the environment while still maintaining the benefits of a vinyl window frame.

uPVC window frames can be recycled and repurposed up to 10 times without the quality or the performance deteriorating.

uPVC sash windows provide a building with increased thermal insulation, meaning that building occupants will use less energy to keep it comfortable with heating and cooling, thus, reducing their carbon footprint.

Furthermore, they are extremely durable, even in harsh weather conditions such as high winds or water exposure.

Not sure if a timber sash window or uPVC sash window is the best choice for your project?

Let us help.

We are the UK’s leading sash window restoration specialists.

To speak with one of our specialists and determine which type of environmentally friendly and sustainable sash window is best for your project, contact us.


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