Everbuild Thermofoam (750ml) x two Part of our expanding tape and foam range Everbuild Thermofoam is a specially formulated, highly flexible PU, gun applied foam that absorbs component movement thereby giving an air tight seal to reduce heat loss and improve energy efficiency in buildings. The powerful bond strength and flexibility of Everbuild Thermofoam gives excellent long term thermal and acoustic insulation by inhibiting cracks from occurring during the contraction of building materials, such as window frame to wall bonds, giving a hermetically sealed barrier.