For heavily-loaded columns or those carrying large moments resulting in high compressive forces the bedding should be fine concrete using a maximum aggregate of 10 mm size and a water-cement ratio of between 0,4 and 0,45. A cement mortar mix is often used for moderately-loaded columns. Weaker filling than this should only be used for lightly-loaded columns where the erection packs are left in position and transfer all the load to the foundation. In cases when erection packs are left in place it may be necessary to re-examine the baseplate design as load transference will be directly through the steel packs.