Homemade cloth face masks need to be at least two layers of fabric in order for them to work effectively, a new study has found.

With face masks in England now mandatory in shops and supermarkets, many of us have been getting creative at home by making our own using old t-shirts, pieces of cloth and tea towels.

According to an observational study published in the medical journal, Thorax, two or three layers of fabric is "significantly better at reducing the droplet spread caused by coughing and sneezing." In fact, two or three 25cm x 25cm squares of cotton fabric sewn together is the recommended width.

A research team at the University of New South Wales in Australia analysed the effectiveness of single and double-layer face coverings, looking specifically at the spread of respiratory droplets when an infected person sneezes, speaks or coughs.

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They found that a double-layer covering was better in reducing droplets from coughing and sneezing, in comparison to the single-layer mask. Elsewhere, researchers also found that three-ply surgical face masks were also one of the most effective options when helping with the spread of the coronavirus.

"A cloth face covering with at least two layers is preferable to a single-layer one. Guidelines on home-made cloth masks should stipulate multiple layers," Prateek Bahl from the School of Mechanical and Manufacturing Engineering at UNSW, told TIME.

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Headshot of Lisa Joyner
Lisa Joyner
Deputy Daily Editor, Country Living and House Beautiful

 Lisa Joyner is the Deputy Daily Editor at House Beautiful UK and Country Living UK, where she's busy writing about home and interiors, gardening, dog breeds, pets, health and wellbeing, countryside news, small space inspiration, and the hottest properties on the market. Previously, she has written for Conde Nast Traveller, House & Garden and Marie Claire magazine. Lisa studied at University For The Creative Arts, where she completed a BA in Fashion Journalism.