Abstract
Measurements have been carried out in an experimental roof rig, under steady-state temperature conditions, to determine the effect of air speed and direction on the thermal performance of glass fibre and mineral fibre loft insulation. The results show that when subjected to steady air speeds of up to 0.25 ms -1, similar to those encountered in lofts, irrespective of direction of flow, the effective λ-value of the insulants is in close agreement with the values obtained in standard thermal conductivity tests. At higher air speeds the X-value tended to increase significantly with increasing air speed and increasing angle of incidence. It was found that the λ-value can be predicted for transient air flow over the loft insulants by evaluating a 'mean integrated' speed for the air pulses and assuming this to be equivalent to a sustained air speed.
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