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Publication Detail
Suspended timber ground floors: measured heat loss compared with models
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Pelsmakers S, Croxford B, Elwell CA
  • Publication date:
    26/06/2017
  • Journal:
    Building Research & Information
  • Print ISSN:
    0961-3218
  • Notes:
    shorttitle: Suspended timber ground floors urldate: 2017-06-27 keywords: Housing, performance gap, Retrofit, Suspended timber ground floors, thermal conductivity, Thermal performance, U-Value file: Pelsmakers et al. - 2017 - Suspended timber ground floors measured heat loss.pdf:C\:\Users\Cliff Elwell\Documents\Research\References\Zotero\storage\S87EI3Z8\Pelsmakers et al. - 2017 - Suspended timber ground floors measured heat loss.pdf:application/pdf;Snapshot:C\:\Users\Cliff Elwell\Documents\Research\References\Zotero\storage\RWCWU3XJ\09613218.2017.html:text/html
Abstract
There are approximately 6.6 million dwellings in the UK built before 1919, predominantly constructed with suspended timber ground floors whose thermal performance has not been extensively investigated. The results are presented from an in-situ heat-flow measuring campaign conducted at 27 locations on a suspended timber ground floor, and the estimated whole-floor U-value compared with modelled results. Findings highlight a significant variability in heat flow, with increased heat loss near the external perimeter. In-situ measured-point U-values ranged from 0.54 ± 0.09 Wm−2 K−1, when away from the external wall perimeter, to nearly four times as high (2.04 ± 0.21 Wm−2 K−1) when near the perimeter. The results highlight the fact that observing only a few measurements is likely to bias any attempts to derive a whole-floor U-value, which was estimated to be 1.04 ± 0.12 Wm−2 K−1 and nearly twice that derived from current models. This raises questions about the validity of using such models in housing stock models to inform retrofit decision-making and space-heating-reduction interventions. If this disparity between models and measurements exists in the wider stock, a reappraisal of the performance of suspended timber ground floors and heat-loss-reduction potential through this element will be required to support the UK’s carbon-emission-reduction targets.
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