A method for limiting visible damage such as cracking within 3D modules of a modular building by maintaining level across storeys comprises determining an axial force for each column element, with a given cross-sectional area, in a stack forming a column traversing a modular building with a plurality of storey. Each storey of the building is occupied by a plurality of column elements of different columns. The method comprises determining an the summed forces on each column element, calculating an individual Force-Area Ratio for each of the column elements, successively summing cumulative Force-Area Ratios from the column elements at the base to the top for each element of a given column and adjusting individual Force-Area Ratios of the column elements within a given storey to be within a specified target range of the cumulative Force-Area Ratios of the other column elements within a given storey. The adjustment may be by adding a shim to one of the column elements that the method indicates will otherwise shorten and cause deflection in the building causing a storey and the building to be off level.
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