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Interlocking Stabilised Soil Blocks (ISSB) are an emerging construction material in Uganda that offer a more sustainable, locally produced alternative to fired clay bricks. Rice husk waste is an under-utilised by-product from rice production in Uganda, and its ash offers potential for lowering the Portland cement requirement of ISSB whilst maintaining mechanical properties. As a prelude to laboratory testing of ash sources accompanied by on-site production and testing of ISSB, a pilot study was carried out to characterise an industrial source of ash. The recently developed R3 heat release test was used to determine ash reactivity. The physical and chemical characteristics of the ash indicate that the industrial combustion process used was sub-optimal. However, its heat release performance suggests it has sufficient pozzolanic reactivity to deserve consideration for use as a supplementary cementitious material in ISSB production.