External thermal insulation composite systems with STEICOprotect 037 wood fibre insulation boards offer natural protection against algae and fungi on the façade. The secret is their particularly high heat storage capacity. During the day, the insulation boards absorb the heat of the day. Due to their high heat storage capacity, the facade cools down only very slowly in the evening. The surface remains warmer than with many conventional insulation materials. In turn, only little humidity condenses on warm surfaces. And drier surfaces deprive algae and fungi of the basis for life.