Ground-floor insulation can reduce floor heat loss by up to 92 percent

October 12, 2017, University College London
Credit: Jessica Spengler/Flickr 

Adding insulation to suspended timber ground floors commonly found in homes built before the Second World War can reduce heat-loss by up to 92 percent, according to research from UCL and the University of Sheffield. 

A simple job for the DIY enthusiast, the research team claim that this intervention has the potential to dramatically reduce heating bills and contribute to the UK's CO2 emissions reduction targets.

During the EPSRC-funded study, Dr Sofie Pelsmakers, a Lecturer in Environmental Design at the University of Sheffield and Dr Cliff Elwell (UCL Energy Institute) tested two different types of in a Victorian house. In one room, EPS beads were injected into the gap, entirely filling it. In another, the floorboards were pulled up and insulation laid between the joists. Results were monitored in 27 locations in the floor.

Dr Pelsmakers explains what they found: "When we analysed the results of the tests, it showed a 65 percent reduction in for the wood-fibre insulation, and a 92% reduction for bead insulation. Our research suggests that there could be massive potential for cost savings in the average property."

The results of the study titled Suspended timber ground floors: Heat loss reduction potential of insulation interventions is published this month in Energy and Buildings. The research is the first of its type conducted in the UK.

While modern homes are built with solid concrete floors, homes built before the Second World War typically have suspended wooden timber floors with a small area underneath for air to circulate. Dr Pelsmakers estimates there could be 10 million such houses, which could all potentially benefit from some form of ground floor insulation.

Installation costs could be as little as £200 per room for the competent DIY-er. Using the most optimistic models, payback could be achieved within two years, and certainly within five from DIY installation.

"We've already seen how simple steps like improving insulation and reducing draughts can prove economical." Dr Pelsmakers says. "In the future, ground floor insulation may provide another effective means to reduce energy consumption."

To maximise heat retention, researchers temporarily sealed the properties' airbricks for the EPS insulation. While no adverse effects were noticed during the research, Pelsmakers and colleagues hope to explore the short and long-term effects of sealing air bricks.

Dr Pelsmakers has some advice for DIY enthusiasts, urging caution. "Our research shows that to gain the maximum benefit from the insulation, it needs to be fitted very well, with no air gaps. However, over time, this could mean that, with the air bricks sealed, there is the potential for moisture to build up in the floor cavity, which could have negative effects. We're currently investigating solutions to this and hope to test these in the near future."

Explore further: New research finds potential for greater retrofit energy savings in homes

Related Stories

10 ways to keep your house warm (and save money) this winter

November 22, 2016

In Britain, people typically switch their central heating on in October and use it daily until March or April. This coincides with the clocks going back, the drop in temperature and Winter Fuel Payments – to anyone who ...

Recommended for you

AI and 5G in focus at top mobile fair

February 24, 2018

Phone makers will seek to entice new buyers with better cameras and bigger screens at the world's biggest mobile fair starting Monday in Spain after a year of flat smartphone sales.

Google Assistant adds more languages in global push

February 23, 2018

Google said Friday its digital assistant software would be available in more than 30 languages by the end of the years as it steps up its artificial intelligence efforts against Amazon and others.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.