C1.1 This Part sets out the required standards for Regulation 11.
C1.2 Standard C2.1 applies to all buildings.
C1.3 Standard C3.1 applies to buildings of any purpose group, having five or more storeys, counting each basement storey as one storey but discounting a storey within a roof space where the slope of the roof is not more than 70 degrees to the horizontal.
STABILITY
C2.1* A building must be designed and constructed so that, taking into account the nature of the ground the combined dead loads, imposed loads, and wind loads are sustained, and transmitted to the ground, without impairing the safety of any part of the building or causing such movement of the ground as will impair the stability of any part of the building.
DISPROPORTIONATE COLLAPSE
C3.1* A building to which this standard applies must be designed and constructed so that in the event of damage occurring to any part of the building, the extent of any resulting collapse will not be disproportionate to the cause of the damage.