What are deflections and
how do they affect a metal building?
Deflections are the engineered allowances that steel can move under stress. For example the lower the deflection is L/180 the more the steel can move. The higher the deflection is L/400 the less the steel will move. Metal buildings are designed to move and flex under loads and because of this they are efficient ways to span great distances. The more a structure can deflect the lighter the steel can be. To achieve high deflection limits more steel is needed to strengthen flanges and webs to restrict movement. More steel means more cost. 
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