In situ measurements have been made of the heat loss through a roof insulated at ceiling level with glass fibre quilt. The results compare favourably with predicted values obtained from standard U-value calculations. An investigation of the dependence of the thermal resistance of the insulation on the air speed at its exposed upper surface showed that the performance of the insulation was not affected by air speed within the range 0 to 0.1 m/s. The air speeds within the loft space were only weakly correlated with external wind speed, and were mostly within the range 0 to 0.1 m/s, for external wind speeds up to 10 m/s.
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References
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1 CIBS Guide Part A3, Chartered Institution of Building Services, London (1980).
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