The designed for wind load is the maximum magnitude that can be withstood by the Thruwall element. The load can be positive or negative (pressure or suction). Typical design range is 1kN/m2 to 1.8kN/m2 but can be more or less.

Internally, unless advised by the project design team, internal pressure is default designed to 200Pa (0.2kN/m2) which is easily catered for in designing for the external wind force.