Qbot Floor Insulation
Investigating the performance of novel floor insulation
It is estimated that around 80% of UK homes have uninsulated ground floors despite substantial benefits that can be achieved when retrofitted. The benefits of insulation are often measured via disaggregated elemental point heat flux measurements, to calculate in situ U values. However, previous work suggests that this approach may be unreliable due to the heterogeneous nature of building elements. This paper presents the results obtained from a series of aggregate and disaggregate in situ fabric performance tests on a case study dwelling that has undergone a suspended timber ground floor insulation retrofit. The results demonstrate that the most appropriate method to adopt to assess the impact of ground floor insulation retrofits would be to adopt an aggregate measurement approach, which measures the change in overall dwelling HTC, rather than a series of changes in point heat flux measurements. By adopting such an approach, it was found that the HTC was reduced by 43 ± 18 W/K, which is equivalent to a 24% reduction. The tests also found that the case study house was twice as leaky as the average UK house and a heat loss of 18.2 W/K was attributed to a reduction in infiltration via Sherman’s N/20 assumption.
- Glew, D., Johnston, D., Miles Shenton ,D., Thomas, F., (In press), Measuring the effects of ground floor insulation, Building Research & Information, tbc