The Right Bi-fold Patio Doors Can Help You Stay Warm This Winter

Blog > Bi-Fold Doors > The Right Bi-fold Patio Doors Can Help You Stay Warm This Winter

Winter is well and truly with us this week, as temperatures drop below freezing for much of the country. A few years ago, having bi-fold patio doors fitted wasn’t such an attractive option in this weather. Not only were problems with poor security there were also high levels of energy inefficiency, largely due to the materials available at the time. 

Since then, patio doors have become a preferred way of beautifying and extending many homes in Britain. They flood interior spaces with natural light and provide convenient access to external areas in stylish ways. And, importantly, their energy efficiency is now considerably higher, as modern technology has found its way into all parts of materials manufacturing.

Everything has improved, from the materials used for the frame to the glass itself.

With aluminium to make these doors very light in weight, yet very strong and durable and vinyl or fibreglass which can be treated to look and feel like wood, but without the high maintenance required of wood, there are endless options for making the perfect addition to the home.

For some, a popular choice is steel. Steel bi-fold patio doors are the most economical to construct. And being strong and durable, they can withstand the fluctuations of most climates. They are also low maintenance requiring very minor upkeep.

Keeping Energy Costs Low This Winter

In the cold of winter, it is important to reduce costs where ever you can. One way to do this is to conserve as much warmth in the house as possible.

The kind of glass used in constructing bi-folding patio doors will determine how energy efficient they will be. By helping to reduce energy costs, the right patio doors will pay for themselves.

At SRL Ltd we can walk you through every step of the process of understanding the types of glass and patio doors available.

With energy efficiency for glass and glazing, there are many factors to consider; such as:


This is the rate at which a window, door, or skylight conducts non-solar heat flow. This measures how much heat you lose from a room through the patio door glass.

Solar Heat Gain Coefficient

SHGC refers to the fraction of solar radiation admitted through a window, door, or skylight

Air Leakage

This is the rate of air movement around a window, door, or skylight in the presence of a specific pressure difference across it.

Sunlight Transmittance

The ability of glazing in a window, door, or skylight to transmit sunlight into a home.

Energy Efficiency Metrics to Consider

There are also other important metrics to consider, such as, Visible Transmittance (VT), Light-to-solar gain (LSG). Other considerations are whether you choose to get Low-E glass, Softcoat or Hardcoat. Also, are you going to buy UV coated glass to reduce the amount of heat that passes through the glass? Would you like glass that darkens with the intensity of the sun?

These factors are interrelated. They will all have an impact on how much you will enjoy your doors, and how much more energy efficient they will be.

Attempting to understand them all and make the decision is going to cost you time and money. Contact the experts at SRL Limited and let’s translate these technical terms into the most important thing this winter – your warmth and comfort.

Sharing is caring!

Categorised in:

Leave a Reply

Your email address will not be published. Required fields are marked *

Join the newsletter