Aluminium-TiH2 powder mixtures have been cold compacted into precursors for foaming using uni-axial pressing. After heat treatment, foaming was only observed for precursors with a % of theoretical density above 94%. This density limit corresponds to the transition from interconnected to closed porosity, confirming that isolating porosity and enveloping the foaming agent in the matrix are vital to successful foaming. Increased expansion was observed with increasing density of the compacted precursor as a result of higher inter-particle shear and increased cold welding reducing the rate at which gas permeates through the compacted structure. As the compaction density of the precursor increases the foam stability also increases due to increased disruption and fragmentation of the oxide films on the powder particle surfaces which improves the effectiveness with which the oxide prevents the collapse of the foam structure.